Spermidine
Polyamine autophagy inducer with preliminary RCT signal for cognitive performance and observational signal for longevity in dietary cohort studies.
Why
Spermidine is a polyamine present in wheat germ, soybeans, mushrooms and aged cheeses. Observational cohort studies (Kiechl JAMA Intern Med 2018, ATTICA cohort) report inverse association between dietary spermidine intake and all-cause mortality. Small interventional RCTs (SmartAge 2022, Wirth 2018) report modest cognitive performance improvements in older adults at 0.9–1.2 mg/day of wheat-germ-derived spermidine. The autophagy-inducing mechanism is well-documented preclinically.
How it works
Inhibits acetyl-coenzyme A carboxylase 1 and induces autophagy via eIF5A hypusination and TFEB activation. Modulates immune function via T-cell autophagy effects. Plasma spermidine declines with age and is inversely correlated with mortality in observational studies.
Expected onset · Cognitive endpoints over 3 months; observational longevity associations over years
How to take
Dosage
Wheat-germ-derived: 1–2 mg spermidine/day (1.2 g of wheat germ extract). Dietary increase via aged cheese, soybeans, mushrooms is the food-first approach.
Timing
Once daily, any time
On the label
Spermidine from wheat germ extract (the trial-grade source) with stated milligrams of spermidine per dose. Aged cheese, soybeans, and certain mushrooms are dietary sources.
Ideal for
Adults exploring longevity-focused dietary interventions; older adults with subjective cognitive complaints; people seeking autophagy-promoting nutritional approaches.
Safety
Evidence
Kiechl 2018 Am J Clin Nutr (n=829 prospective cohort): higher dietary spermidine intake associated with significantly lower all-cause mortality at 20-year follow-up. Schwarz 2022 SmartAge RCT (n=85 older adults): wheat germ spermidine 1.2 mg/day for 3 months produced no significant difference vs placebo on primary memory endpoint, modest secondary signals. Preliminary evidence, no Cochrane review, EMA HMPC monograph or EFSA-authorised health claim covers this indication; cited RCTs are small or in non-tier-1 journals. Useful as honest reference rather than evidence-grade recommendation.
Strong observational data; interventional RCT results have been smaller than the observational signal would predict. No Cochrane review, no EMA monograph. Food-source spermidine (aged cheese, soybeans, mushrooms) is the cleanest route given current evidence.
- Kiechl et al., Am J Clin Nutr 2018, higher spermidine intake is linked to lower mortality: a prospective population-based study
- Schwarz et al., Cortex 2022, SmartAge, effects of spermidine supplementation on memory performance and biomarkers in cognitively impaired older adults (RCT)
- Madeo et al., Science 2018, spermidine in health and disease (review)
Where to get it
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