Amino acid that supports mitochondrial energy production and cognitive function. NSF Certified for Sport.

Highly porous substance used for detoxification and digestive comfort. USP Medical Grade.

Consistent 7-9 hours. The foundation of health. No supplement can compensate for chronic sleep deprivation.

Alpha-lipoic acid (ALA) is an antioxidant produced by the body that plays a role in mitochondrial energy production. It is both fat- and water-soluble, giving it broader tissue access than most antioxidants. The strongest clinical evidence is in diabetic peripheral neuropathy, multiple RCTs show symptom improvement at 600mg daily IV or oral. Evidence for general antioxidant benefit, glucose metabolism support, and weight loss is more limited and mixed. ALA is generally well-tolerated. The R-form (R-ALA) is the biologically active enantiomer and is considered more potent than the racemic mixture (R/S-ALA) sold in most products. Best supported for those with diabetic neuropathy or metabolic conditions.

Flavonoid from chamomile and parsley. Promotes relaxation and sleep quality. May have anxiolytic and neuroprotective effects.

Ashwagandha (Withania somnifera) is an adaptogenic herb with one of the stronger evidence bases among botanicals. Multiple RCTs using KSM-66 and Sensoril extracts show consistent reductions in cortisol (around 20-30%) and self-reported stress scores. Sleep quality improvements are also well-documented. The evidence for testosterone and physical performance is present but weaker, real effects in some populations, less consistent across studies. Standard dosing is 300-600mg of a standardised extract daily. Rare liver injury cases have been reported at high doses; avoid in pregnancy. Works best for people dealing with high stress or disrupted sleep, less compelling as a general performance supplement.

Powerful carotenoid antioxidant from algae. Protects eyes, skin, and mitochondria. Superior antioxidant capacity compared to other carotenoids.

Comprehensive blend of B vitamins. Supports energy metabolism, nervous system function, and cellular health. Useful for high-stress periods.

Traditional Ayurvedic herb. Strong evidence for memory enhancement and learning. Effects build over 8-12 weeks.

Branched-chain amino acids (leucine, isoleucine, valine) get marketed as a muscle-building essential. For most people eating adequate protein (1.6-2.2g/kg/day), they're redundant, because you're already getting them in whey, meat, eggs, and legumes. Where BCAAs might help: fasted training sessions, very low-calorie cuts, or situations where whole-food protein isn't practical mid-session. The evidence for hypertrophy gains beyond what protein intake provides is limited. If your protein is dialed in, skip this.

Natural source of dietary nitrates. Improves blood flow and endurance performance. Effects are acute and dose-dependent.

Berberine is a plant alkaloid found in barberry, goldenseal, and other plants that activates the enzyme AMPK, the same pathway activated by metformin. The blood sugar evidence is the most compelling: multiple RCTs show meaningful reductions in fasting glucose, HbA1c, and post-meal glucose spikes, with effect sizes comparable to metformin in some trials. Evidence for lipid lowering is also reasonable. What is often overlooked is the drug interaction profile: berberine is a CYP3A4 inhibitor and should be used cautiously with many medications, including cyclosporine and blood thinners. Standard dosing is 500mg two to three times daily with meals. Not a supplement to take casually if you are on prescription medications.

Amino acid that buffers muscle acidity. Highly effective for high-intensity exercise lasting 1-4 minutes. Causes harmless tingling.

Rich in anthocyanins that support eye health and circulation. Traditional use for night vision and retinal protection.

Binaural beats are an auditory illusion created when two slightly different frequencies are played separately to each ear, the brain perceives a rhythmic beat at the difference frequency, theoretically entraining brainwave activity. The evidence is preliminary: small studies suggest alpha-frequency binaural beats (8-14 Hz) may help reduce anxiety and improve focus in some individuals, but study quality is generally low and effect sizes modest. There are no large, well-controlled trials, and mechanisms remain debated. They may suit people seeking low-effort, low-risk relaxation or focus tools, particularly those who already find ambient sound helpful for concentration. Not suitable for those with epilepsy or seizure disorders; requires headphones for the stereo separation effect to work. PGSS take: Harmless and free if you already own headphones, but treat the relaxation benefits as the real mechanism rather than brainwave entrainment.

A water-soluble B vitamin that serves as a cofactor for carboxylase enzymes involved in fatty acid synthesis, gluconeogenesis, and amino acid metabolism, commonly supplemented for hair and nail health.

Traditional herbal remedy for managing menopausal symptoms like hot flashes and night sweats.

Blue-blocking glasses filter short-wavelength blue light (400-500 nm) from screens and artificial lighting, which is known to suppress melatonin production and shift circadian phase when exposure occurs in the hours before sleep. Evidence supports blue-light blocking as a sleep-support intervention: studies show improved sleep onset, increased melatonin levels, and better sleep quality in individuals wearing amber-tinted blue-blockers for 2-3 hours before bed. A 2021 meta-analysis confirmed statistically significant improvements in sleep quality across randomised trials. They benefit shift workers, late-night screen users, and anyone with difficulty winding down before sleep, particularly those unable to simply dim screens or avoid devices in the evening. Glasses that only filter a small fraction of blue light (clear-tinted 'computer glasses') have weaker evidence; amber-tinted lenses with >90% blue-light filtration perform best. PGSS take: A low-cost, no-pharmacology sleep tool with legitimate evidence, the lens colour matters. Clear lenses with minor filtration are not the same intervention as amber lenses worn in the 2-3 hours before bed.

Active compound from broccoli sprouts. Activates antioxidant pathways and supports cellular detoxification. Promising longevity research.

Caffeine is one of the most studied performance compounds in sports science, and the evidence is unusually consistent: meta-analyses show it reliably improves short-duration power output, endurance, and alertness at 3-6 mg/kg bodyweight. It works by blocking adenosine receptors, which keeps perceived exertion lower for the same workload. Downsides are real too. It disrupts sleep if taken within 6-8 hours of bedtime, and chronic high doses build tolerance. Tested for purity and pharmacopeia-grade potency, not that caffeine is easy to fake.

Calcium Alpha-Ketoglutarate (Ca-AKG) is an intermediate in the Krebs cycle, a metabolic hub your cells use to generate energy, and the reason it has attracted longevity researchers is that circulating AKG levels decline by roughly 10-fold between ages 40 and 80. In animal models, Ca-AKG supplementation has extended median lifespan by 10-16% in mice, reduced frailty markers, and supported bone density. Human evidence is early but notable: a 2021 observational study of 42 individuals taking Ca-AKG for 4-10 months found an average 8-year reduction in DNA methylation age, a biological age marker, though the study lacked a control group. The ABLE trial, a double-blind RCT of 120 middle-aged participants, is actively investigating Ca-AKG versus placebo on methylation age and metabolic parameters, with results expected to sharpen (or challenge) the current picture. Proposed mechanisms include activation of AMPK longevity pathways, inhibition of mTOR, free radical scavenging, and autophagy support. Adults in midlife or beyond concerned with healthspan and metabolic aging are the target audience; safety data from human studies to date has been favorable with no notable adverse effects. Genuinely interesting science in its early innings, probably worth watching, possibly worth trying.

Essential mineral for bone health and muscle function. Most important during growth years and for those at risk of osteoporosis.

Calcium glucarate works through a specific and somewhat elegant mechanism: it inhibits beta-glucuronidase, an enzyme produced by gut bacteria that can cleave glucuronic acid off already-conjugated hormones and toxins, allowing them to be reabsorbed from the intestines instead of excreted. In practical terms, this supports phase II liver detoxification, particularly glucuronidation, the process by which the liver packages estrogen, steroid hormones, and xenobiotics for elimination. Preliminary animal and in vitro studies have shown calcium glucarate can inhibit tumor promotion in breast, prostate, and colon cancer models, and rat studies demonstrated it can reduce serum estrogen levels significantly. Clinical evidence in humans is limited, most of the human-relevant data comes from pharmacokinetic studies rather than RCTs, so the effect sizes in people remain uncertain. Women with estrogen dominance symptoms, PMS, or perimenopause seeking gentle hormonal support, and people with high exposure to environmental toxins, are the most commonly cited candidates. It is generally well-tolerated, found naturally in fruits and cruciferous vegetables, and has no known serious interactions at supplement doses. A supplement where the mechanism is more clearly established than the clinical evidence, honest potential, not proven protocol.

Powerful antioxidant fullerene molecule dissolved in organic oil for cellular protection and longevity.

Soluble fibers that feed beneficial gut bacteria. Improves microbiome diversity, digestion, and may enhance mineral absorption.

Green algae with potential detoxification properties. Rich in chlorophyll and nutrients. Evidence for heavy metal binding is preliminary.

Choline is an essential nutrient, your body cannot synthesize enough independently, and the rate-limiting precursor to acetylcholine, the neurotransmitter driving memory, cognition, and neuromuscular signaling. It is also structurally required for phosphatidylcholine, which makes up 40-50% of all cell membranes and is necessary for the liver to export fat as VLDL particles; without adequate choline, triglycerides accumulate, a well-documented pathway to fatty liver disease. Despite these critical roles, surveys like the Framingham Offspring Study find dietary intake in the lowest quartile falls around 150 mg per day, well below the Adequate Intake of 550 mg for men and 425 mg for women. A study of nearly 1,400 adults found higher choline consumption was associated with superior memory performance at midlife, and deficiency has been linked to increased neurodegenerative disease risk. Pregnant women, vegans, low-egg eaters, and those with PEMT gene variants are at the highest risk. Bitartrate is cost-effective but lower in bioavailability than alpha-GPC; very high doses can cause a fishy body odor and occasionally GI upset. The essential nutrient most people are quietly running low on without knowing it.

Structural component of cartilage. Often paired with glucosamine for joint health. Evidence suggests modest benefits for osteoarthritis.

Trace mineral that enhances insulin sensitivity. Helpful for blood sugar control and may reduce carb cravings.

Ceylon cinnamon standardized for polyphenols. Improves insulin sensitivity and blood sugar control. Ceylon variety is safer for long-term use.

Amino acid that increases nitric oxide production. Improves blood flow and reduces fatigue during exercise.

Deliberate cold exposure via cold showers or ice baths. Builds resilience, may boost metabolism and mood.

Hydrolyzed collagen protein. Strong evidence for skin elasticity, joint health, and bone density. Types I and III most common.

Hydrolyzed collagen that improves skin elasticity, hydration, and reduces wrinkles. Clinically proven to support skin health from within.

Hydrolyzed bovine or marine-derived collagen peptides supplying types I and III collagen that stimulate fibroblast activity to support skin hydration and elasticity, joint cartilage health, and connective tissue integrity.

Coenzyme Q10 is a fat-soluble compound essential for mitochondrial energy production and acts as an antioxidant. The body produces it naturally, but levels decline with age. The evidence for statin-related muscle pain (myopathy) is the most clinically relevant: statins block CoQ10 synthesis, and supplementation shows some benefit in reducing muscle symptoms in some patients, though trials are mixed. For heart failure, CoQ10 at 300mg daily has RCT support for modest improvements in symptoms and outcomes. Evidence for general energy, athletic performance, and anti-aging is more limited. Ubiquinol (the reduced form) may have better bioavailability than ubiquinone, particularly in older adults. Standard dose is 100-300mg daily with food.

Creatine monohydrate is the most thoroughly studied performance supplement in existence, and after decades of scrutiny, the science keeps holding up. It works by expanding the phosphocreatine pool in muscle cells, enabling faster ATP regeneration during high-intensity efforts, the energy currency your muscles burn through in the first few seconds of a sprint, a heavy lift, or a hard interval. A 2025 meta-analysis confirmed creatine produces significant muscle strength gains versus placebo, with effect sizes favoring both trained and untrained individuals. The brain connection is increasingly credible: a 2022 meta-analysis in Nutrition Reviews found creatine improved memory performance in healthy individuals, with the strongest effects in older adults. A comprehensive 2025 safety analysis of 685 clinical trials found no significant difference in side effect rates between creatine and placebo groups, a finding that should finally retire the kidney-damage mythology. Athletes, aging adults concerned with muscle mass and cognition, and anyone doing resistance training are the clearest beneficiaries. It causes water retention inside muscle cells (not subcutaneous bloat), and some experience minor GI discomfort at loading doses. The rare supplement where the hype turned out to be underselling it.

Enhanced absorption curcumin formula with black pepper extract. Superior bioavailability for anti-inflammatory effects.

Active compound in turmeric. Powerful anti-inflammatory with extensive research. Needs black pepper or enhanced bioavailability.

Endogenous steroid hormone that supports vitality and healthy aging. NSF Certified Facility.

Compound thought to support acetylcholine production and cognitive focus. NSF Certified Facility.

Emotional Freedom Techniques. Combines cognitive therapy with acupressure for stress reduction.

A blend of key electrolytes, primarily sodium, potassium, and magnesium, formulated to replenish minerals lost through sweat during prolonged exercise, supporting fluid balance, muscle function, and hydration during endurance activity.

Eye Movement Desensitization and Reprocessing (EMDR) is a structured psychotherapy protocol involving guided bilateral stimulation, typically eye movements, while recalling distressing memories, designed to reduce their emotional intensity. The evidence for PTSD is strong: EMDR is recognised by the WHO, APA, and NICE as an effective first-line treatment for post-traumatic stress disorder, with meta-analyses showing effect sizes comparable to trauma-focused CBT. It helps people who have experienced psychological trauma, including single-incident events (accidents, assaults) and complex developmental trauma. EMDR should be conducted by a trained therapist; self-administered versions lack evidence and are not recommended for severe trauma. PGSS take: One of the few psychological interventions with the evidence quality of a pharmaceutical, if trauma is part of your picture, this is a serious option worth discussing with a qualified therapist.

A cold-pressed oil from Oenothera biennis seeds providing gamma-linolenic acid (GLA) that influences prostaglandin synthesis and may modestly relieve premenstrual syndrome symptoms, psychological menopausal symptoms, and cyclical breast pain.

Filtered water removes contaminants that accumulate in municipal and private water supplies, including PFAS (per- and polyfluoroalkyl substances), heavy metals, chlorine, and microplastics. The evidence for hydration as a health intervention is gold-standard: adequate water intake supports cognitive performance, kidney function, cardiovascular health, and thermoregulation. The case for filtration specifically rests on PFAS exposure data, the EPA set maximum contaminant levels for six PFAS in 2024 due to links with immune disruption, hormone interference, and increased cancer risk. Everyone benefits, but particularly those on private well water, those in older housing with lead pipes, or anyone in areas with documented PFAS contamination. Reverse osmosis removes the widest range of contaminants; activated carbon targets chlorine and some VOCs; basic filters vary widely. PGSS take: One of the highest-impact, lowest-cost interventions available, the infrastructure matters as much as any supplement you take.

A naturally occurring flavonoid found in strawberries that demonstrates senolytic activity by selectively clearing senescent cells, with anti-inflammatory and antioxidant properties studied primarily in animal models and pilot human trials.

Omega-3 fatty acids (primarily EPA and DHA from fish oil) are among the most widely studied supplements. The evidence for triglyceride reduction is strong and consistent across multiple RCTs, high-dose omega-3 (2-4g daily EPA+DHA) reliably lowers high triglycerides. Cardiovascular outcomes are more mixed: early trials were promising, but larger meta-analyses show mixed results in general populations. The PISCES trial (2026) showed a striking 43% reduction in serious cardiovascular events in haemodialysis patients, confirming the mechanism works in high-risk populations. Omega-3 also supports anti-inflammatory pathways and shows reasonable evidence for mood support. Most people supplement at 1g daily, the effective doses in trials are typically 2-4g. Look for EPA/DHA content on the label, not total fish oil weight. A 1000mg fish oil capsule often contains only 300mg of actual omega-3.'s active ingredients, EPA and DHA, are the raw materials your body uses to build anti-inflammatory signaling molecules, maintain neuronal membrane fluidity, and regulate cardiovascular function through triglyceride reduction, platelet activity, and blood pressure. A Harvard meta-analysis of clinical trials found daily omega-3 supplementation is associated with an 8% reduced risk of heart attack and coronary heart disease death. The landmark PISCES trial, a multicenter RCT of 1,228 dialysis patients, found 4 grams per day reduced the composite risk of heart attack, stroke, cardiac death, and vascular amputation by 43% versus placebo. Brain health is a legitimate secondary target: DHA is a major structural component of the cerebral cortex, and observational data consistently links higher omega-3 intake to better cognitive outcomes and lower depression rates. People with high triglycerides, cardiovascular risk factors, low fish consumption, or mood concerns are the most logical users. High doses can increase bleeding time and may interact with anticoagulants; quality matters because poorly stored fish oil oxidizes readily. One of the supplements where the evidence is strong enough that the debate has shifted from whether to how much.

GABA (gamma-aminobutyric acid) is the brain's primary inhibitory neurotransmitter, responsible for reducing neuronal excitability and promoting calm. Oral GABA supplements contain the molecule itself, though whether exogenous GABA crosses the blood-brain barrier in meaningful quantities remains debated. Human evidence is limited but growing: some small RCTs suggest oral GABA supports relaxation and sleep onset, potentially via gut-brain axis mechanisms rather than direct CNS activity. It may benefit people experiencing mild anxiety, stress, or difficulty relaxing before sleep, effects are modest and individual responses vary considerably. Generally well-tolerated; no significant adverse effects at typical supplemental doses. Not a substitute for clinical treatment of anxiety disorders. PGSS take: The blood-brain barrier question is real and unresolved, but the relaxation data in humans is genuine enough to take seriously. Think of it as a mild, non-habit-forming option for wind-down support.

Traditional digestive aid with anti-inflammatory properties. Reduces nausea, aids digestion, and may help with joint pain.

Ancient tree extract used for cognitive support. Improves blood flow to the brain. Mixed evidence for memory in healthy adults.

Amino sugar that supports cartilage health. Popular for joint pain and osteoarthritis. Effects are modest but consistent.

Glutathione is the body's primary endogenous antioxidant, produced by every cell. Oral supplementation has historically been questioned because it gets broken down in the gut, but newer liposomal and acetylated forms show measurably better uptake in recent trials. Evidence supports modest benefits for markers of oxidative stress and liver function, particularly in people with higher baseline inflammation. Not a replacement for sleep and diet, which do the heavy lifting on your glutathione status. iTested Verified for purity.

Simple amino acid with broad benefits. Improves sleep quality, supports collagen synthesis, and protects liver. Very safe and well-tolerated.

Epigallocatechin gallate is the main active polyphenol in green tea. Evidence supports modest effects on metabolic markers (fat oxidation, blood lipids) and antioxidant status, especially at doses of 400-800 mg/day in combination with caffeine. The catch: isolated EGCG at very high doses (above 800 mg/day fasted) has been linked in rare cases to hepatotoxicity, which is why regulatory bodies now flag it. Staying under that threshold and taking it with food resolves most concerns. iTested Verified for polyphenol content.

High-Intensity Interval Training alternates short bursts of near-maximal effort with brief recovery periods, typically completing more physiological work in 20-30 minutes than longer moderate sessions. The evidence base is gold-standard: HIIT reliably improves VO₂ max, insulin sensitivity, cardiovascular fitness, and body composition across multiple meta-analyses and RCTs. It is particularly efficient for time-constrained individuals and has shown strong results for metabolic health in people with prediabetes and type 2 diabetes. People with cardiovascular conditions or musculoskeletal injuries should consult a physician before starting, intensity is the key variable that demands appropriate entry points. PGSS take: One of the highest-return lifestyle interventions available, the time efficiency argument is evidence-backed, not marketing. Start with 2 sessions per week and build.

Glycosaminoglycan that retains moisture. Supports skin hydration, joint lubrication, and tissue repair. Molecular weight affects absorption.

Myo-inositol bridges metabolic and mental health in an unusual way. Evidence supports its use for insulin sensitivity in PCOS (several RCTs show ovulation and cycle improvements at 2-4g/day with d-chiro-inositol), and there's growing data on mood and anxiety at higher doses. It's technically a sugar alcohol your body already produces, so tolerability is excellent. Results take 8-12 weeks, so patience is required. NSF Certified for Sport confirms the lot isn't contaminated with banned substances.

Time-restricted eating. May improve metabolic health and cellular repair, though largely from calorie restriction.

Iron is an essential mineral required for haemoglobin synthesis and oxygen transport throughout the body. Iron deficiency is the most common nutritional deficiency worldwide, particularly in menstruating women, pregnant women, and endurance athletes. Symptoms of deficiency include fatigue, impaired exercise capacity, reduced cognitive function, and eventually anaemia. The evidence for supplementation in deficient individuals is strong and consistent. What is often missed is that iron supplementation is primarily appropriate for people who are deficient, routine supplementation in iron-replete individuals can cause GI side effects and, at high doses, may have adverse effects. Absorption is enhanced by vitamin C and reduced by calcium, tea, and coffee. Ferrous forms (ferrous sulphate, ferrous gluconate) are better absorbed than ferric forms.

Traditional herb used to support relaxation and stress reduction. iTested Verified.

Essential for thyroid hormone production and metabolism regulation. Critical for energy and metabolic health. Deficiency is common in areas without iodized salt.

Krill oil delivers the same cardiovascular workhorses as fish oil, EPA and DHA, but in phospholipid form rather than triglycerides, a structural difference that appears to meaningfully improve absorption efficiency. A study in Lipids in Health and Disease found omega-3 absorption was significantly greater from krill oil than from fish oil at equivalent doses, which means you may need less of it to achieve the same plasma EPA/DHA concentrations. Krill oil also contains astaxanthin, a carotenoid antioxidant not found in most fish oils, which may protect the oil from oxidation both in the capsule and in the body, though clinical benefits of astaxanthin at krill-oil doses remain preliminary. On cardiovascular markers, a randomized trial found krill oil reduced LDL cholesterol by 32-39% and increased HDL by 42-60% compared to baseline, outperforming fish oil in that specific study, though larger comparative trials are still limited. People who have experienced the fishy reflux of standard fish oil, those seeking a more compact omega-3 dose, or anyone interested in the astaxanthin bonus are the natural audience. Krill harvesting raises sustainability questions worth considering; shellfish-allergic individuals should avoid it. Fish oil's more expensive, better-absorbed, sustainability-complex younger sibling.

Traditional herb studied for reducing alcohol cravings and supporting metabolic health.

Conditionally essential amino acid. Supports intestinal barrier function and gut lining repair. Important during stress or illness.

L-theanine is the amino acid that makes green tea calming despite its caffeine content, a neat trick it pulls off by promoting alpha brain wave activity, the same neural signature observed during relaxed alertness and meditation. It modulates GABA, dopamine, and serotonin without sedation, and inhibits excessive glutamate excitatory activity, giving it a mechanistic profile that is genuinely distinct from most relaxation supplements. The strongest evidence involves the caffeine combination: a review of 11 placebo-controlled RCTs found L-theanine and caffeine together improved attention-switching accuracy, alertness, and cognitive performance more effectively than either compound alone, with L-theanine blunting the jitteriness and cardiovascular spike that caffeine produces in isolation. A widely cited study found that 100 mg caffeine paired with 200 mg L-theanine improved both speed and accuracy on cognitive tasks. Standalone L-theanine has decent evidence for stress reduction at 200 mg doses, though the effect sizes are more modest. People who want caffeine's focus without its anxiety, especially those who are sensitive to stimulants, are the clearest beneficiaries. It is well-tolerated with no established toxicity at standard doses. The supplement that quietly explains why a cup of green tea feels different from an espresso shot.

Amino acid precursor to dopamine and norepinephrine. Supports focus under cognitive stress. NSF Certified Facility.

Probiotics are live microorganisms that, when administered in adequate amounts, confer a health benefit. The evidence base is broad but highly strain-specific, benefits shown for one strain do not transfer to others. The strongest evidence is for antibiotic-associated diarrhoea prevention (Lactobacillus rhamnosus GG and Saccharomyces boulardii specifically), Irritable Bowel Syndrome symptom reduction (mixed strains, modest effect sizes), and some immune support. The emerging mood-gut axis research is interesting but not yet at the stage where specific probiotic protocols can be recommended for mental health. Most healthy adults do not need routine supplementation. Most useful during or after antibiotic courses, or for people with functional gut disorders.

Low Carb High Fat dietary pattern to shift metabolism toward fat-burning and ketosis.

Medicinal mushroom with potential neuroprotective properties. Emerging research on cognitive support.

Carotenoid that concentrates in the macula. Protects against blue light damage and age-related macular degeneration. Essential for long-term eye health.

Carotenoids that accumulate in the retina. Strong evidence for protecting against age-related macular degeneration and blue light damage.

Luteolin is a flavonoid found in celery, parsley, chamomile, and many other plants, with potent anti-inflammatory and antioxidant properties demonstrated in cell and animal studies. Human evidence is limited: preliminary research suggests luteolin may support neurological health and reduce inflammation markers, but well-powered RCTs in humans are lacking. Early research suggests it may benefit people with inflammatory conditions or those seeking neuroprotection, though the translational gap between preclinical and human data remains significant. Generally well-tolerated at typical supplemental doses; no major safety signals have emerged in available human studies. PGSS take: Genuinely promising preclinical profile, but honest evidence assessment places it in the 'watch this space' category, the mouse data is exciting, the human data is not yet there.

Adaptogenic root for supporting vitality, libido, and energy levels. NSF Certified Facility.

Magnesium citrate is one of the best-absorbed oral forms, with bioavailability consistently above oxide in comparative trials. Evidence supports its use for repletion in deficiency, mild constipation (it's a saline laxative at higher doses), and muscle cramp prevention in athletes. For sleep or anxiety specifically, the RCT data is thinner and mixed, despite the marketing. Take it away from calcium and iron to avoid absorption interference. NSF Certified Facility for potency and contaminant control.

Magnesium is involved in over 300 enzymatic reactions in the body, yet studies suggest roughly half of Americans don't meet daily requirements from diet alone, making it one of the most prevalent and underappreciated deficiencies in modern life. Glycinate is the form most associated with sleep and stress: glycine itself has independent calming properties, and magnesium blocks NMDA receptors and modulates the glutamate-GABA balance in ways that dampen neuronal hyperexcitability. A 2025 RCT published in Nature and Science of Sleep found magnesium bisglycinate significantly reduced insomnia severity scores versus placebo over four weeks, with the most pronounced benefits in people with lower baseline dietary magnesium intake. A systematic review of 18 studies found evidence suggestive of a beneficial effect on subjective anxiety in vulnerable populations, though the reviewers noted the overall quality of evidence remains limited and larger trials are warranted. People with poor sleep, stress-related muscle tension, or diets low in leafy greens, nuts, and seeds are reasonable candidates. High-dose magnesium can cause loose stools, especially in the glycinate's less-absorbed cousins like oxide, and people with kidney disease should consult a physician before supplementing. The most boring-sounding supplement that quietly matters to almost everyone.

Unique form of magnesium that readily crosses the blood-brain barrier to support cognitive health. NSF Certified for Sport.

Medium-chain triglycerides bypass the standard fat digestion pathway and head straight to the liver for rapid energy. Evidence supports modest effects on satiety and ketone production, which is why they show up in keto protocols and bulletproof coffee. For general energy or focus outside a ketogenic context, results are more individual than the marketing implies. Start low (1 tsp/day), because higher doses cause predictable GI complaints. Informed Choice Certified confirms no banned substances or adulterants.

Mindfulness meditation is a structured practice of directing attention to present-moment experience, breath, sensation, or thought, without judgment. The evidence base is strong: consistent meditation practice helps reduce perceived stress, supports emotional regulation, and may lower anxiety and depression scores in clinical populations. A landmark 2014 meta-analysis (JAMA Internal Medicine) found mindfulness programs showed moderate improvements in anxiety, depression, and pain versus control conditions. It benefits individuals managing chronic stress, anxiety, or sleep difficulties, and is increasingly used alongside therapy for mood disorders. Rare adverse effects (depersonalisation, increased anxiety) have been reported in intensive retreat settings, standard daily practice (10-20 min) carries negligible risk. PGSS take: Free, accessible, and genuinely evidence-backed, if there is one non-supplement intervention on PGSS worth taking seriously, this is it.

Melatonin is a hormone produced by the pineal gland that regulates the sleep-wake cycle. The evidence for sleep onset is strong, particularly for jet lag, shift work, and delayed sleep phase disorder. What most people get wrong is the dose. The effective dose in RCTs is typically 0.5-1mg, yet most commercial supplements contain 5-10mg. Higher doses do not produce proportionally better sleep and may cause morning grogginess. The key is timing: melatonin works by signalling circadian phase, not by sedation. Take 30-60 minutes before your target sleep time. It is not a sleeping pill. Short-term use is well-established as safe; long-term use data in adults is reassuring but limited.

L-methylfolate is the biologically active form of folate, bypassing the MTHFR enzyme conversion step that some people (reportedly 30-40% of the population) perform inefficiently. Evidence supports its use for high homocysteine, pregnancy planning, and as adjunctive in some mood protocols. If you have no MTHFR variants, regular folic acid or food folate works fine and costs less. Overdosing masks B12 deficiency on blood tests, so pair with B12 if supplementing long-term. NSF Certified Facility.

Silymarin-rich herb that protects liver cells from toxins and supports liver regeneration. Gold standard for liver health supplementation.

Organic sulfur compound. May reduce joint pain and inflammation. Popular among athletes, though research is still emerging.

Multi-species mushroom complexes typically combine reishi, lion's mane, chaga, turkey tail, cordyceps, and other medicinal mushrooms, each with distinct proposed mechanisms including beta-glucan immune modulation, NGF (nerve growth factor) stimulation, and adaptogenic activity. Evidence is mixed and species-dependent: turkey tail beta-glucans have genuine immune data; lion's mane has preliminary cognitive evidence; reishi shows anti-inflammatory signals; cordyceps may support exercise capacity, but most human studies are small and short-term. They may suit individuals seeking broad immune and cognitive support, particularly those who prefer whole-food-matrix supplementation over isolated compounds. Mushroom products vary enormously in quality, whole fruiting body extracts are generally more bioavailable than mycelium-on-grain products, and beta-glucan content should be specified. PGSS take: A reasonable broad-spectrum choice with emerging evidence, but treat individual species claims with calibration, and look for fruiting body extracts with disclosed beta-glucan content.

NAC (N-Acetyl Cysteine) is the molecule emergency rooms use to save lives from acetaminophen overdose, which tells you something interesting about what it does inside a healthy liver every day. As a direct precursor to glutathione, the body's master antioxidant, NAC replenishes cellular defenses that stress, toxins, and aging steadily erode. A 2020 meta-analysis of 12 RCTs found NAC significantly reduced malondialdehyde, a key marker of oxidative stress, across a range of doses from 400-2000 mg per day. Beyond the liver, NAC modulates glutamate homeostasis in the brain, a mechanism that has made it a subject of serious psychiatric research, with RCTs showing improvements in depression and anxiety scores in patients with mood disorders and substance use conditions. People dealing with chronic oxidative load, respiratory issues, or mood dysregulation alongside high oxidative stress may find NAC particularly relevant. Those on nitroglycerin or blood thinners should flag the interaction with their doctor, and people with asthma or GI ulcers should approach with caution. One of the few supplements that pulls double duty across liver health and brain chemistry, with the hospital-ward credibility to back it up.

Precursor to NAD+ that supports cellular energy and DNA repair. NSF Certified for Sport.

NAD+ precursor that declines with age. Emerging research on cellular energy, DNA repair, and longevity. More bioavailable than NR.

Essential phospholipid for cognitive function, memory, and cortisol management. NSF Certified Facility.

Phosphorus is the second most abundant mineral in the body, essential for bone mineralisation (as hydroxyapatite alongside calcium), cellular energy production (ATP), and cell membrane integrity (phospholipids). The evidence for phosphorus adequacy is solid: deficiency impairs bone formation, muscle function, and energy metabolism. Supplementation is well-supported in populations with documented insufficiency, particularly older adults and those with malabsorption conditions. Most people consuming a typical Western diet receive adequate dietary phosphorus from protein-rich foods; supplementation is primarily relevant for those with renal disease, malnutrition, or clinical deficiency. People with kidney disease should exercise caution, impaired phosphorus excretion can lead to hyperphosphataemia, which is associated with cardiovascular calcification. PGSS take: A foundational mineral that rarely needs supplementation outside clinical deficiency, it supports the case for a protein-adequate diet over standalone supplementation for most people.

Blend of proteases, lipases, and amylases. Aids breakdown of macronutrients and reduces digestive discomfort. Useful for enzyme deficiency.

Essential electrolyte for heart function, blood pressure, and energy metabolism. Most people get enough from fruits and vegetables.

Cofactor that supports mitochondrial biogenesis. May enhance cellular energy production and cognitive function. Works synergistically with CoQ10.

Soluble fiber powerhouse. Exceptional for gut health, regularity, and microbiome support. Also aids cholesterol and blood sugar control.

Soluble fiber supplement. Excellent for blood sugar control, cholesterol, and digestive health. Very cost-effective.

French maritime pine bark extract. Potent antioxidant that supports circulation, skin health, and inflammation control.

Quercetin is a flavonoid found in onions, apples, and green tea with anti-inflammatory and antioxidant properties. Laboratory and animal studies are extensive; human clinical evidence is more limited. The strongest human evidence is for allergy symptom reduction (quercetin inhibits histamine release from mast cells) and modest anti-inflammatory effects. Some evidence suggests it may support cardiovascular health by reducing blood pressure and LDL oxidation, but effect sizes in trials are small. Quercetin has low oral bioavailability, combination with bromelain or piperine improves absorption. Standard dosing is 500-1000mg daily. It is generally safe; drug interactions with blood thinners and immunosuppressants are worth checking with a prescriber.

A legume-derived isoflavone complex containing formononetin, biochanin A, daidzein, and genistein that acts as a weak phytoestrogen to modestly reduce hot flash frequency and intensity in peri- and postmenopausal women.

Red light therapy (photobiomodulation) uses specific wavelengths (630-850 nm) of low-level red and near-infrared light to interact with mitochondria at the cellular level. Research suggests it may support skin health, reduce inflammation, and aid muscle recovery, with the strongest evidence in dermatology and wound healing. Some studies show promising results for joint pain and hair loss, though effects vary by device, dosage, and treatment site. It may benefit people seeking non-pharmacological support for skin rejuvenation, joint comfort, or post-exercise recovery. Avoid direct eye exposure without appropriate protection. PGSS take: Emerging evidence base with solid dermatological data, worthwhile for skin and recovery goals, but device quality and protocol matter enormously.

CAUTION: Natural source of monacolins (statins). EFSA (2025) concluded monacolin K is unsafe at any dose. EU ban proposed (expected Q3 2026). Severe adverse effects include rhabdomyolysis and liver damage. Use only under medical supervision.

Progressive overload with weights. The single most effective intervention for strength, metabolism, and longevity.

Polyphenol found in red wine. Activates sirtuins related to longevity, but bioavailability is limited.

Adaptogenic herb that reduces fatigue and improves stress resilience. Popular among athletes and students.

A standardized extract from the Crocus sativus flower containing crocin and safranal that modulate serotonin and dopamine to produce antidepressant and mood-enhancing effects comparable to standard antidepressants in mild-to-moderate depression.

Heat stress from sauna bathing. Strong evidence for cardiovascular health and longevity. Finnish studies show impressive benefits.

Powerful hepatoprotective herb. Silymarin protects liver cells and supports regeneration. Extensively studied for liver health.

Sodium chloride, table salt, in pharmaceutical-grade form, is the dominant extracellular electrolyte in the human body and the primary driver of fluid retention, blood volume, and nerve impulse transmission. During exercise, sweat sodium losses are substantial and highly individual, and replacing it matters for both performance and for avoiding dangerous hyponatremia. The evidence for sodium's rehydration role is consistent: drinks with higher sodium concentrations improve fluid retention by around 36% compared to plain water, reduce urine output by roughly 60%, and increase voluntary fluid intake through heightened thirst drive. For performance directly, the picture is more mixed, multiple endurance trials found sodium supplementation during races did not improve finish times versus placebo, though pre-exercise sodium loading has outperformed glycerol hyperhydration for plasma volume expansion in some protocols. Endurance athletes exercising in heat or for more than 60-90 minutes are the clearest candidates for deliberate sodium supplementation. Excessive intake is linked to hypertension; people with cardiovascular or kidney disease should stay within medically advised limits. The world's most unglamorous supplement, doing the most fundamental job.

Spermidine is a polyamine naturally produced in every human cell and found in high concentrations in fermented foods like natto, aged cheese, and wheat germ, and it may be one of the most compelling longevity compounds you've never heard of. Its primary mechanism is autophagy induction: spermidine inhibits the acetyltransferase EP300, shifting cellular metabolism toward the breakdown and recycling of damaged proteins and organelles rather than accumulation. Spermidine supplementation has extended lifespan in yeast, roundworms, flies, and mice, with mouse studies showing approximately 10% longer lifespan and suppressed age-related cardiovascular decline. In humans, epidemiological data published in the journal Aging found higher dietary spermidine intake associated with reduced overall, cardiovascular, and cancer mortality. A 2020 study in eLife demonstrated that spermidine levels in human T-cells decline with age and that supplementation restored autophagy function in T-cells from older donors to levels comparable to young donors, a meaningful cellular finding. People in midlife or beyond, or those interested in immune aging and cellular maintenance, are the most relevant audience. Safety appears favorable in short-term studies; longer-term human RCT data is still accumulating. The longevity supplement that gets less attention than it deserves, largely because it's hard to pronounce.

Blue-green algae superfood. Rich in protein, vitamins, and antioxidants. May support immune function and reduce inflammation.

Conditionally essential amino acid. Supports cardiovascular health, exercise performance, and cellular function. Levels decline with age.

Extract of Eurycoma longifolia, traditionally used to support testosterone levels and libido. NSF Certified Facility.

A flowering plant traditionally used in Ayurvedic medicine as an aphrodisiac, with small RCTs showing modest improvements in sexual function and desire, though testosterone-boosting claims are not consistently supported.

The reduced, active form of CoQ10. Superior absorption for cellular energy, heart health, and antioxidant support.

Postbiotic metabolite that supports mitochondrial function and muscle health. NSF cGMP Certified Facility.

Valerian has been used for sleep complaints for centuries, but the RCT evidence is mixed. A 2020 systematic review found modest improvements in sleep quality for some users, though effect sizes were small and studies heterogeneous. It appears to work through GABA modulation, similar in mechanism (not magnitude) to benzodiazepines. Best used short-term for mild sleep onset difficulty, not chronic insomnia. Safety profile is generally good, though some users report morning grogginess or vivid dreams. NSF Certified Facility for potency and contaminant testing.

Fat-soluble vitamin essential for vision, immune function, and cellular health. Deficiency is rare in developed countries.

Essential for glucose metabolism and energy production. Supports nervous system and cardiovascular health.

Vitamin B12 (cobalamin) is essential for DNA synthesis, nerve function, and red blood cell formation. Deficiency is common in older adults (due to reduced stomach acid and intrinsic factor) and in vegans and vegetarians (B12 is found almost exclusively in animal products). Deficiency causes neurological damage that can become irreversible if untreated, this makes adequate B12 one of the most clinically important nutritional concerns for plant-based eaters. Supplementation is straightforward and effective. For most people supplementing preventively, cyanocobalamin and methylcobalamin are both effective; the debate about their relative merits is mostly academic at standard doses. Blood serum B12 levels can be misleading, active B12 (holotranscobalamin) and methylmalonic acid are better markers of functional status.

Highly bioactive form of Vitamin B6. Supports energy metabolism, mood regulation, and cognitive health.

Vitamin C (ascorbic acid) is an essential water-soluble antioxidant required for collagen synthesis, immune function, and iron absorption. Severe deficiency causes scurvy; subclinical deficiency is associated with immune impairment and slower wound healing. The evidence for high-dose vitamin C reducing cold duration is modest but real, supplementation may shorten colds by about a day in the general population, with larger effects in people under extreme physical stress. The popular belief that vitamin C prevents colds is not well-supported. For skin, topical vitamin C is better evidenced than oral for collagen-related benefits. Excess oral vitamin C is excreted in urine; the upper tolerable intake is 2g daily, above which GI upset and kidney stone risk increase.

Vitamin D3 is technically a hormone precursor, not a vitamin, a distinction that matters, because virtually every immune cell carries a receptor for its active form. The liver and kidneys convert D3 into calcitriol, which orchestrates innate immunity (ramping up antimicrobial peptides like cathelicidin), shifts T-cell activity toward tolerance over inflammation, and maintains the calcium homeostasis that keeps bones dense and muscles functional. Deficiency is the most common nutritional shortfall in industrialized populations, with estimates placing it at 40-70% of adults depending on latitude and season. A meta-analysis of 15 RCTs found subjects with adequate vitamin D levels were 30-40% less likely to experience severe infection versus deficient individuals, and systematic reviews link sufficiency to reduced autoimmune disease risk in conditions including MS and rheumatoid arthritis. Anyone with limited sun exposure, dark skin, older age, or obesity is at higher risk of deficiency. Toxicity is real but rare at typical supplemental doses, the Institute of Medicine sets the upper limit at 4,000 IU/day, and blood testing is the only way to know if you actually need it. The supplement most people should test for before taking, and probably need after.

Vitamin E is a fat-soluble antioxidant that exists in eight natural forms; mixed tocopherol supplements provide alpha-, beta-, gamma-, and delta-tocopherol rather than alpha-tocopherol alone, more closely mirroring the dietary pattern. Evidence supports vitamin E as a key player in protecting cell membranes from oxidative damage, with particular relevance for skin health, immune function, and cardiovascular protection at population level. Supplementation helps correct deficiency, most common in individuals with fat malabsorption (Crohn's disease, cystic fibrosis), and may support skin elasticity and immune response. Isolated alpha-tocopherol at high doses (>400 IU/day) has shown unfavourable signals in some large trials (HOPE-TOO); mixed tocopherols at dietary-range doses do not carry the same concern. PGSS take: The form matters, mixed tocopherols at moderate doses are a better choice than high-dose alpha-tocopherol alone. Useful for deficiency correction and skin-focused goals.

Directs calcium to bones and away from arteries. Works synergistically with Vitamin D for bone and cardiovascular health.

The long-acting menaquinone form of vitamin K2 that activates matrix Gla-protein and osteocalcin to direct calcium into bone and away from arteries, supported by multiple RCTs for bone density and arterial stiffness.

Supports hormonal balance by modulating prolactin levels; frequently used for PMS and cycle regularity.

Whey is the most studied protein supplement for muscle protein synthesis, with decades of trials confirming its leucine content and rapid absorption hit the anabolic signal efficiently. For anyone resistance training, 20-40g within a few hours of a session reliably supports recovery and hypertrophy. Outside that window, total daily protein (1.6-2.2g/kg) matters more than timing. Whey isolate is better tolerated by the lactose-sensitive than concentrate. If you're hitting protein from whole foods already, this is a convenience product, not a necessity.

Zinc is an essential mineral involved in immune function, protein synthesis, wound healing, and testosterone production. The immune evidence is the strongest: adequate zinc is critical for immune cell function, and supplementation reduces the duration of common colds (particularly zinc lozenges started within 24 hours of symptom onset). For testosterone, the relationship is real but conditional, zinc supplementation restores levels in deficient men, but has no meaningful effect in men who are already zinc-sufficient. Dietary zinc is found in red meat, shellfish, and legumes. Typical supplementing doses are 15-30mg daily. Long-term intake above 40mg can deplete copper, consider a zinc-copper balance if supplementing consistently.

Low-intensity aerobic exercise where you can maintain a conversation. Builds mitochondrial health and endurance base.