Spermidine is a polyamine naturally found in wheat germ, soybeans, aged cheese, and mushrooms that induces autophagy — the cell's self-cleaning process that recycles damaged proteins and organelles. A 2018 observational study in the Lancet found higher dietary spermidine intake was associated with REDUCED ALL-CAUSE MORTALITY (5+ year follow-up). This is the most compelling longevity signal for any dietary polyamine. Our research shows it also improved memory in elderly adults (SmartAge trial) and extended lifespan in yeast, flies, worms, and mice. Spermidine may be the "caloric restriction mimetic" that actually works through diet — without requiring the extreme restriction.
Spermidine induces autophagy through epigenetic mechanisms: (1) it inhibits the acetyltransferase EP300/p300, which leads to deacetylation of ATG proteins (autophagy machinery); (2) deacetylated ATG proteins activate autophagosome formation — the cell packages damaged proteins, dysfunctional mitochondria, and aggregated debris into membrane-bound vesicles; (3) autophagosomes fuse with lysosomes for degradation and recycling of components. This "cellular housekeeping" becomes less efficient with age, allowing damaged proteins and organelles to accumulate — contributing to neurodegeneration, cancer, and cardiovascular disease. Spermidine essentially keeps the cleaning crew working.
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Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.