Spermidine at a glance
A fast read for beginners, with evidence strength, route context, safety depth, and community activity surfaced before the deeper sections.
Spermidine is a naturally occurring polyamine found in virtually all eukaryotic cells, where it plays essential roles in DNA stabilization, translation regulation, protein hypusination, and the induction of macroautophagy - the cellular self-cleaning process by which damaged proteins and organelles are degraded and recycled. Intracellular spermidine levels decline with aging, and this decline is associated with reduced autophagic flux and accumulation of cellular damage.
The longevity-promoting properties of spermidine were established across multiple model organisms: yeast, C. elegans, Drosophila, and mice all demonstrate lifespan extension with spermidine supplementation. In mice, spermidine extended median and maximal lifespan, improved cardiac function, reduced age-related inflammation, and enhanced memory. The primary mechanism is autophagy induction via inhibition of acetyltransferases (EP300), which deacetylates key autophagy-initiating proteins and reduces epigenetic marks associated with cellular aging.
Dietary spermidine intake (from wheat germ, soybeans, mushrooms, aged cheeses, and semen) is associated in epidemiological studies with reduced all-cause mortality and specifically with reduced cardiovascular disease risk. The SMAC (Spermidine in Aging Cardiac Health) trial demonstrated that 1-year spermidine supplementation (0.9 mg/day spermidine-rich wheat germ extract) significantly reduced diastolic dysfunction markers and improved diastolic function in older adults with subclinical heart failure - a Phase 2 randomized controlled trial with rigorous design.
Cognitive benefits of spermidine supplementation have been investigated in a Phase 2b RCT (SmartAge trial, Berlin), which reported that spermidine-rich plant extract supplementation for 12 months improved memory performance in at-risk older adults compared to placebo. These results, published in a peer-reviewed journal, represent meaningful human evidence beyond the preclinical data.
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