Longevity supplement
Spermidine is a naturally occurring polyamine (1-(3-aminopropyl)butane-1,4-diamine) found in wheat germ, aged cheese, mushrooms, and soy products that induces autophagy — the cellular self-cleaning process. Research led by Frank Madeo and colleagues at the University of Graz, Austria, has established spermidine as a geroprotective compound in animal models. Human clinical trials, including the SmartAge study, have explored cognitive benefits in older adults with promising but preliminary results.
Present autophagy and geroprotection research without overstating human clinical evidence. Distinguish between dietary spermidine intake and supplementation. Do not publish dosing protocols or sourcing instructions. Track ongoing clinical trials.
The SmartAge randomized clinical trial found that 12 months of spermidine supplementation improved memory performance in older adults with subjective cognitive decline (Schwarz et al., JAMA Netw Open, 2022; Madeo as senior author, University of Graz).
A comprehensive review in Nature Aging described the mechanisms of spermidine-induced autophagy and geroprotection, establishing the mechanistic framework for its longevity effects (Hofer et al., Nat Aging, 2022; Madeo lab, University of Graz).
An earlier randomized controlled trial showed positive effects of spermidine on memory performance in older adults at risk for dementia (Cortex, 2018).
Spermidine is found naturally in wheat germ, aged cheese, soy products, and mushrooms. It is available as a dietary supplement but is not FDA-approved as a drug for any indication.
Evidence level: Preclinical
Sources: PubMed / NCBI, PubMed / NCBI
Autophagy induction is well-established in preclinical models. The Nature Aging review by Hofer/Madeo provides the mechanistic framework. Human longevity outcomes are not yet proven.
Evidence level: Peer reviewed
Sources: PubMed / NCBI, PubMed / NCBI
The SmartAge trial (JAMA Netw Open, 2022) is the key human study. Results showed memory improvements in subjective cognitive decline but are preliminary. Cite directly and note study limitations.
Evidence level: Established
Sources: Wikipedia, PubMed / NCBI
Dietary sources are well-established. Distinguish between dietary intake and pharmacological supplementation, which may involve different doses and effects.
Source records are stored in the repo and linked from each claim.
Metformin is an FDA-approved biguanide antidiabetic (marketed as Glucophage and generics) used as first-line therapy for...
Evidence reviewNAD+ (nicotinamide adenine dinucleotide) is an essential cellular coenzyme whose levels decline with age. Two precursors...
Regulatory watchRapamycin (sirolimus) is an FDA-approved mTOR inhibitor (marketed as Rapamune) used to prevent organ transplant rejectio...
Evidence review