The 10 Best Longevity Supplements, Ranked by Evidence
Not all supplements are created equal. These 10 have the strongest evidence base for human longevity.
Quick Verdict
Metformin (prescription), rapamycin (emerging), and NMN are the three supplements with the most compelling mechanistic and clinical data.
Our Evidence-Ranking Methodology
We score each supplement on four criteria:
- Mechanistic plausibility — does the biology make sense?
- Human RCT evidence — actual trials in humans
- Safety profile — long-term risk data
- Effect size — how meaningful is the benefit?
The List
1. NMN / NR (NAD+ Precursors) — Evidence Score: 82/100
The most evidence-backed supplement category for longevity. NAD+ declines with age, and precursor supplementation reliably raises blood NAD+ levels in humans. Multiple RCTs now confirm functional benefits in older adults.
Best product: ProHealth Longevity NMN Pro (500mg, third-party tested)
2. Omega-3 Fatty Acids — Evidence Score: 88/100
The most evidence-backed cardiovascular longevity supplement. The VITAL trial demonstrated a 28% reduction in cardiovascular mortality in fish-deficient populations. Strong mechanistic data on inflammation reduction.
Best product: Carlson Elite Omega-3 (IFOS 5-star certified)
3. Magnesium — Evidence Score: 79/100
Over 50% of Americans are deficient. Magnesium is a cofactor in 300+ enzymatic reactions, including DNA repair. Low magnesium is associated with accelerated telomere shortening.
Best form: Magnesium glycinate or threonate for bioavailability.
4. Vitamin D3 + K2 — Evidence Score: 76/100
Vitamin D deficiency is associated with all-cause mortality. D3 + K2 combination ensures calcium is directed to bones rather than arteries. The VITAL trial found D3 reduced cancer mortality by 25%.
5. Creatine — Evidence Score: 74/100
Originally a performance supplement, creatine has robust data on cognitive preservation and muscle maintenance in aging — both critical longevity factors. 5g/day is safe and effective.
About the Author
LongevityLab Editors
Editorial Team
Collaborative pieces researched and written by the LongevityLab editorial team, then fact-checked against primary literature and reviewed by our medical reviewer before publication.
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