Spermidine
Spermidine is a polyamine, a small molecule found in all living cells and in foods such as wheat germ, soybeans and aged cheese.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
Overview
A polyamine; named active content must be distinguished from extract weight.
What human studies found
The longevity story is ahead of the trials.
An early memory pilot suggested a possible signal, with substantial uncertainty. The later, larger SmartAge trial did not improve its primary memory outcome over twelve months. 1 2
A short trial of a high-purity formulation examined tolerability and circulating polyamines. Such measurements cannot establish a longevity benefit, and one formulation cannot validate every wheat-germ supplement. 3
Compare declared spermidine in milligrams, not just wheat-germ extract weight. Check the complete allergen information and whether the measured amount is per capsule or per suggested serving.
Where the evidence stops
- The cited trials do not demonstrate longer human lifespan or dementia prevention.
- Extract mass and actual spermidine content are different quantities.
- Exploratory findings need confirmation; they do not overturn a negative primary endpoint.
Key studies
The most recent publications linked to Spermidine's ratings.
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
