Cognition/Heart/Longevity

Spermidine

Naturally occurring polyamine studied for cellular renewal and memory support in older adults, found in wheat germ and aged cheese.

score

evidence

Caution

risk

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Use with caution

This supplement may interact with medications, medical conditions or sensitive populations. Review safety before use.

Overview

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Safety

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Quick Take

Promising but early-stage; consider if you are 60+ and interested in longevity, but benefits are modest.

Spermidine is a naturally occurring polyamine found in foods like wheat germ, aged cheese, and mushrooms. It plays a key role in cellular homeostasis by inducing autophagy, the body's process for clearing damaged cellular components. Small randomized trials in older adults suggest it may improve memory performance and modestly lower blood pressure, while observational studies link higher dietary intake to lower cardiovascular mortality. It is primarily of interest to older adults seeking to support healthy aging, though evidence remains preliminary.

Potential benefits

Improves memory in older adults

May lower blood pressure

May support cognitive performance

May reduce cardiovascular risk

May support healthy aging

May reduce mortality risk

Protocol

Amount

1-2 mg

Frequency

Once daily

When

Morning with breakfast — absorption may be improved with food, and autophagy rhythms favor daytime intake in some models.

Onset Time

8-12 weeks for memory and blood pressure changes

Who Should Consider

Adults 60+ with subjective memory decline

People interested in longevity interventions

Those with low dietary polyamine intake

Individuals with mildly elevated blood pressure

Food Sources

Wheat germ (richest common dietary source)
Aged cheese such as parmesan and cheddar
Mushrooms, especially shiitake varieties
Natto (fermented soybeans)

How It Works

Spermidine binds to and activates proteins that trigger autophagy, a catabolic process that recycles damaged organelles and proteins. By restoring autophagic flux—which declines with age—it may help maintain mitochondrial function, reduce oxidative stress, and preserve synaptic plasticity in neurons. These cellular effects are thought to translate into improvements in memory and vascular function

Updated 5/19/2026