Cognition/Heart/Longevity

Spermidine

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

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

Proven Benefits

01Improves memory in older adults

02May lower blood pressure

03May support cognitive performance

04May reduce cardiovascular risk

05May support healthy aging

06May reduce mortality risk

Chemical Forms

Recommended

Spermidine trihydrochloride
Spermidine-rich wheat germ extract

Avoid

Generic 'spermidine' with no standardization
Undisclosed plant extracts claiming polyamine content

Expert Note

Most human trials use standardized wheat germ extract delivering 1-2 mg spermidine daily. Pure spermidine trihydrochloride is used in newer supplements, but direct comparative bioavailability data in humans is limited. Avoid products that do not disclose spermidine content per serving, as polyamine levels vary widely between sources.

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.

Safety & Limits

Upper Safe Limit

No established UL; doses up to 6 mg/day have been used in short-term trials without serious adverse effects.

Cycling

Safe for continuous use

Contraindications

Pregnancy or breastfeeding — insufficient safety data

History of orthostatic hypotension — may lower blood pressure further

Cancer patients undergoing active treatment — theoretical concern around polyamine metabolism and cell proliferation

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