Spermidine for Lifespan Extension
Spermidine induces autophagy — the cellular cleanup process that declines with age — and dietary intake correlates with lower mortality in cohort studies.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 1–2 mg/day supplemental (or spermidine-rich foods: wheat germ, aged cheese, mushrooms, natto).
- Expected timeframe
- Not established
Protocol
- form
- Wheat germ extract standardised for spermidine content; contains gluten unless certified gluten-free
- duration
- Human trials have run 3-12 months
- co factor
- Evidence is insufficient in humans by necessity. Spermidine extends lifespan in yeast, nematodes, flies and mice, with the mouse data showing increased median lifespan and cardioprotection - a stronger preclinical record than most longevity compounds. Human evidence is observational: cohort studies including the Bruneck study associate higher dietary spermidine intake with lower all-cause mortality, an association confounded by the whole grains, legumes and vegetables that supply it. No randomised trial can realistically measure human lifespan, and the human trials that exist measure short-term surrogates and have been largely negative on primary endpoints.
- titration
- Not applicable - no human lifespan data exist or can exist from trials of this length
- starting dose
- Not established. Human trials used 1.2 mg/day (SmartAge) to 6 mg/day of spermidine from wheat germ extract
Evidence
What the studies say
Spermidine intake and mortality risk: a prospective population-based study
Kiechl S, Pechlaner R, Willeit P +3 more
Higher dietary spermidine intake was associated with lower all-cause mortality
Cardioprotection and lifespan extension by the natural polyamine spermidine
Eisenberg T, Knauer H, Schauer A +26 more
Dietary spermidine extended lifespan in yeast, flies, worms and mice, and in aged mice it preserved cardiac diastolic function, reduced hypertrophy and lowered blood pressure. Benefits required intact autophagy and were absent in autophagy-deficient animals. Human cohort data (Bruneck study) linked higher spermidine intake to lower cardiovascular mortality.
Safety
Caveats
Long-term human safety data are limited. Doses in supplements are close to dietary levels — food sources are a reasonable alternative.
Less likely to help if
Medical Disclaimer
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Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.