The longevity supplement market is exploding, driven by aging populations, biohacker culture, and genuine public interest in healthspan. But sorting signal from noise requires looking at evidence, not marketing.
Strong Evidence
Omega-3 Fatty Acids (EPA/DHA)
Decades of research and multiple large-scale clinical trials. The REDUCE-IT trial showed a 25% reduction in cardiovascular events with high-dose EPA. Consistent evidence for anti-inflammatory effects and emerging data on cognitive protection.
Evidence grade: A. Well-supported by human clinical trials.
Vitamin D3
Deficiency is remarkably common (estimated 40-50% globally) and associated with increased mortality, immune dysfunction, and bone loss. The VITAL trial showed reduced cancer mortality in the vitamin D group.
Evidence grade: A for correcting deficiency.
Magnesium
Involved in over 300 enzymatic reactions. Most adults don't hit the RDA through diet. Forms matter: glycinate for sleep, threonate for cognitive function, citrate for general supplementation.
Evidence grade: A. Widespread deficiency, clear benefits from correction.
Good Evidence, With Caveats
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Creatine
Originally a sports supplement, now gaining attention for cognitive benefits and muscle preservation in aging. One of the most studied supplements in history with an excellent safety profile.
Evidence grade: A for muscle function. B for cognitive benefits.
Collagen Peptides
Randomized controlled trials show benefits for skin elasticity, joint comfort, and bone density. A meta-analysis of 19 studies found significant improvements in skin hydration.
Evidence grade: B+. Good clinical evidence, though study sizes are often modest.
Promising But Early
NAD+ Precursors (NMN/NR)
NAD+ levels decline with age. Animal studies are impressive — improved mitochondrial function, DNA repair, and extended healthspan. Human trials are underway but limited.
Evidence grade: C+. Strong theoretical basis, but human evidence is thin.
The Basics That Beat Supplements
- Sleep: 7-9 hours of quality sleep reduces all-cause mortality
- Resistance training: Muscle mass is one of the strongest longevity predictors
- Zone 2 cardio: 150+ minutes per week improves cardiovascular health
- Protein intake: 1.2-1.6g per kg bodyweight supports muscle preservation
Key Takeaways
The supplements with the strongest longevity evidence are remarkably unsexy — omega-3s, vitamin D, magnesium. They work because most people are deficient. Invest in the basics first.
