Blind Ranking
Tap items in order of preference. Pick #1 of 10.
Item A
Creatine is the most research-backed supplement in existence and the biggest surprise in longevity research: over 700 peer-reviewed studies, originally studied for athletic performance, now showing compelling evidence for cognitive aging protection and muscle preservation in older adults. The mechanism is straightforward — creatine replenishes ATP faster, improving cellular energy availability. For adults over 50, muscle preservation (sarcopenia prevention) is one of the strongest predictors of lifespan. The Examine.com grade: A for cognitive function in sleep-deprived adults, A for lean mass in resistance-training adults. Dose: 3-5g daily. Cost: approximately $0.10 per day. No loading phase required. No credible evidence of kidney damage in healthy adults despite the persistent myth.
Item B
CoQ10 is an antioxidant synthesized by the body that declines with age and is depleted by statin medications. The CoQ10-statin connection is clinically important: statins reduce CoQ10 synthesis by up to 40%, and this correlates with the statin side effect of muscle pain (myalgia) in approximately 5-10% of users. For statin users over 50, CoQ10 supplementation has strong clinical rationale. The broader longevity evidence shows CoQ10 improves mitochondrial function and reduces oxidative stress markers. The ubiquinol form (reduced CoQ10) absorbs 3-8x better than ubiquinone in older adults. Dose: 100-200mg ubiquinol daily with fat-containing meal. Standard warning: the effect size in healthy, non-statin-using younger adults is modest.
Item C
Fish oil with high EPA and DHA content remains one of the best-documented supplements for cardiovascular health, with the REDUCE-IT trial showing 4g/day of high-purity EPA reduced major cardiovascular events by 25% in high-risk patients. The effect size in primary prevention is more modest but consistent. The critical nuance: regular fish oil (not prescription-strength) has more variable evidence, partly because the studies used different doses and different EPA:DHA ratios. Current best practice: target at least 2g combined EPA+DHA daily from either high-quality fish oil or algae-based DHA (the vegan option that skips the fish entirely — algae is where fish get their omega-3s). Triglyceride form absorbs better than ethyl ester form. Refrigerate after opening to prevent oxidation.
Item D
Berberine is the most underrated supplement on this list: a plant alkaloid found in barberry, goldenseal, and Oregon grape that activates AMPK — the same cellular energy sensor targeted by metformin, the most-studied longevity drug. Meta-analyses find berberine reduces fasting blood glucose by approximately 20%, comparable to metformin, with an HbA1c reduction of 0.9% in pre-diabetic and diabetic populations. For metabolic health and insulin sensitivity, the evidence is strong (Examine.com grade A for blood glucose reduction). The surprise: berberine also shows evidence for lipid lowering (LDL reduction of 20-30% in RCTs) and gut microbiome improvement. Dose: 500mg three times daily with meals. Significant drug interactions — do not combine with cyclosporine or blood thinners without physician review.
Item E
NMN is the most discussed longevity supplement in academic circles and the most controversial on this list. It is a precursor to NAD+, a molecule that declines approximately 50% between age 20 and 50 and plays a central role in DNA repair, mitochondrial function, and cellular senescence. Animal studies are consistently impressive. Human trials have been mixed but improving: a 2023 double-blind RCT published in Nature Aging found 300mg/day NMN improved muscle insulin sensitivity and physical performance in overweight adults. The honest assessment: the human evidence is still thin relative to the theoretical mechanism. Price is high ($60-100/month for quality brands). The 2025 Longevity Research Consortium grades it B for human evidence — promising but not yet A-tier. Taking it costs money; not taking it carries the risk of missing a genuine discovery.
Item F
Approximately 42% of American adults are vitamin D deficient (serum 25-OH-D below 20 ng/mL), and deficiency correlates with 35+ disease states including cardiovascular disease, autoimmune conditions, and all-cause mortality. The evidence for supplementation in deficient individuals is strong: a 2022 VITAL trial of 25,000 participants found 2,000 IU/day D3 reduced cancer mortality by 25%. The K2 pairing matters: D3 increases calcium absorption, but without K2 (specifically MK-7 form), that calcium may deposit in arteries rather than bones. The combined D3+K2 approach is now standard in longevity medicine. Dose: 2,000-5,000 IU D3 + 100-200 mcg MK-7 K2 daily. Get baseline bloodwork first — optimal level is 40-60 ng/mL, not just above deficiency threshold.
Item G
Collagen makes up 30% of the body total protein and is the primary structural component of skin, bones, tendons, and cartilage. Collagen synthesis declines approximately 1% per year after age 25. The supplement evidence has improved markedly since 2020: a 2024 meta-analysis of 19 RCTs found hydrolyzed collagen reduced knee joint pain in osteoarthritis by a standardized mean difference of 0.87 (clinically meaningful), and 4 RCTs show improved skin elasticity with 2.5-10g/day supplementation. The mechanism involves the absorption of specific dipeptides (hydroxyproline-proline) that signal fibroblasts to produce more endogenous collagen. Combined with vitamin C (required for collagen synthesis), the effect is enhanced. Dose: 10-15g hydrolyzed collagen daily. Type II for joints, Type I/III for skin and bone.
Item H
Low-dose lithium is the most surprising and most evidence-backed supplement that almost nobody takes. This is not prescription psychiatric lithium (which is dosed at 600-1200mg): lithium orotate provides 5-10mg elemental lithium, which is close to the amount found in mineral-rich drinking water in regions with exceptionally low rates of neurodegenerative disease. Epidemiological studies in Texas, Japan, and Austria find inverse correlations between lithium in drinking water and rates of dementia, suicide, and violent crime — with the strongest signal for Alzheimer's prevention. A 2020 double-blind RCT in mild cognitive impairment patients found 300mcg lithium daily stabilized cognitive function over 15 months versus decline in placebo group. The mechanism involves inhibition of GSK-3β, a protein involved in tau phosphorylation and neurodegeneration. At low doses, side effect profile is minimal. This is a research-stage recommendation — discuss with a physician.
Item I
Ashwagandha is an adaptogen with the strongest evidence profile among all adaptogens, and the KSM-66 extract has the best-quality human trial data. RCT evidence supports: cortisol reduction (8-27% reduction in chronic stress populations), testosterone increase in men (14-17% in double-blind RCTs), anxiety reduction comparable to low-dose benzodiazepines in one trial, and improved thyroid function in subclinical hypothyroidism. The longevity connection is indirect but meaningful: chronic cortisol elevation accelerates cellular aging via telomere shortening and inflammatory signaling. Cortisol management is increasingly viewed as a longevity lever. Dose: 300-600mg KSM-66 daily. Take with food. The one caveat: avoid in autoimmune conditions (theoretical stimulation of immune activity).
Item J
Magnesium is involved in over 300 enzymatic reactions in the body, yet 68% of Americans do not meet the RDA. The specific form matters: magnesium oxide (the cheapest form) has approximately 4% bioavailability; glycinate and malate forms reach 50-80%. Research links adequate magnesium to better sleep quality (RCT evidence), reduced blood pressure, improved insulin sensitivity, and lower all-cause mortality. The 2025 meta-analysis of 13 prospective studies found each 100mg/day increase in dietary magnesium associated with a 7% reduction in cardiovascular mortality. Dose: 200-400mg elemental magnesium as glycinate or malate, taken at night. The most common side effect of the oxide form (loose stools) is absent with glycinate.