Best of
Best Supplements for Longevity (Evidence-Backed Only)
Last updated Mon Jun 08 2026 00:00:00 GMT+0000 (Coordinated Universal Time)· 2 min read
RCT evidence— Listed entries have at least one solid RCT or strong observational evidence
The honest short list
For most adults
- Creatine monohydrate 3–5 g/day — the most evidence-backed performance and muscle-preservation supplement; safety profile excellent. Especially valuable in older adults.
- Vitamin D 1,000–2,000 IU/day if deficient. Skip if 25(OH)D is >75 nmol/L.
- Omega-3 from food (fatty fish 2–3 times/week) preferred over supplements for most adults. High-dose EPA (4 g/day icosapent ethyl) has cardiovascular RCT evidence in hypertriglyceridaemia.
For specific situations
- Magnesium glycinate or citrate 300–400 mg/day — reasonable evidence for blood pressure, sleep, and constipation in deficient adults.
- Vitamin B12 1,000 μg/day for vegans, older adults, metformin or PPI users with low or borderline serum B12 (+/- MMA confirmation).
- Vitamin K2 (MK-7) 100–200 μg/day if on high-dose vitamin D, particularly with calcium supplementation.
- Spermidine from food (wheat germ, mature cheese, mushrooms) or modest supplements — observational data favourable; supplement formulations vary widely.
- Urolithin A 500–1,000 mg/day — best-evidenced supplement for inducing mitophagy in humans.
For specific conditions
- Sulforaphane from broccoli sprouts (free) or a standardised supplement — NRF2 activation; emerging evidence in cardiovascular, autism, schizophrenia.
- GlyNAC — promising small RCT in older adults; replication awaited.
- CoQ10 in patients on statins with myalgia, or in heart failure.
What we leave off the list (and why)
- Multivitamin: low effect size in trials; useful as insurance only in adults with diet gaps.
- Resveratrol: original mechanistic story didn’t survive scrutiny; effect size in healthy humans disappointing.
- NMN / NR: raise NAD+ reliably; hard-endpoint clinical benefits remain modest. Not on the "everyone should take" list.
- Ashwagandha, rhodiola, other adaptogens: small effects on stress markers; limited longevity evidence.
- Most "anti-aging" stacks sold as bundles: hype outpaces evidence almost universally.
Practical principles
- Get blood levels of the vitamin / mineral you’re supplementing when relevant.
- Buy from manufacturers with third-party testing (USP, NSF).
- Don’t take handfuls at once — absorption interactions matter.
- Reassess annually — many supplements are temporary, not forever.