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Longevity & Mitochondrial

Spermidine

Also known as Spermidine trihydrochloride · Spermidine-rich wheat germ extract

Emerging researchOral (dietary supplement / capsule, often as spermidine-rich wheat germ extract)Dietary intake from food sourcesNot an FDA-approved drug and not approved to treat, prevent, or cure any condition. In the United States it is marketed as a dietary supplement; a spermidine-rich wheat germ extract has an FDA GRAS notice (GRN 889) for use in certain foods, but supplements are not subject to FDA pre-market approval. In the EU, spermidine-rich wheat germ extract is authorized by EFSA as a Novel Food with a defined safe upper intake. As a naturally occurring polyamine and food constituent, spermidine is not listed on the WADA Prohibited List and is not specifically banned for athletes; athletes should always verify current status via Global DRO or their governing body.

Spermidine is a naturally occurring polyamine found in foods such as wheat germ, soybeans, aged cheese, mushrooms, and legumes, and is also produced endogenously in the body, with levels generally declining with age. In laboratory research it acts as a caloric-restriction mimetic that induces autophagy (cellular recycling), proposed to work by inhibiting the acetyltransferase EP300 and by supporting hypusination of the translation factor eIF5A, with downstream effects on mitochondrial function. It has extended lifespan and shown cardio- and neuroprotective effects across yeast, worm, fly, and rodent models in an autophagy-dependent manner. Human research is still limited: small and observational studies have examined cognition (for example MMSE outcomes in older adults with subjective cognitive decline) and arterial aging, and larger controlled trials such as POLYCAD in coronary artery disease are ongoing. Overall the mechanistic and preclinical evidence base is substantial, while confirmatory human outcome data remain early.

Studied / used for

  • Investigated for induction of autophagy and cellular renewal pathways
  • Studied for cognitive aging and memory in older adults with subjective cognitive decline
  • Investigated for cardiovascular and arterial aging, including in coronary artery disease trials
  • Studied in model organisms for lifespan extension and healthy-aging markers
  • Investigated for mitochondrial function and immune aging (immunosenescence)

Commonly reported side effects

  • Mild gastrointestinal discomfort commonly reported
  • Nausea reported in some trial participants
  • Bloating reported in some users
  • Generally described as well tolerated, with no serious adverse events attributed in published clinical research to date
Emerging research. Active research; human evidence still developing. This reflects the strength of the research base, not effectiveness or a recommendation.

Not medical advice.

This is an educational reference. Peptalk does not recommend, prescribe, endorse, or rate any compound, and provides no dosing information. Do not start, stop, or change any peptide, hormone, supplement, or therapy based on this page. All clinical decisions must be made with your licensed healthcare provider.

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