The Longevity Series — Guides

What is Spermidine? A Plain-English Guide

The polyamine with the unfortunate name — found in wheat germ, natto and aged cheese, and one of the fastest-rising compounds in longevity research.

What spermidine is

Spermidine is a polyamine — a small molecule produced naturally in the body and found across the food supply. Its concentration in tissues declines with age, which is one reason it has become a major subject of longevity research, with population studies examining dietary spermidine intake and ageing.

Where it's found in food

The richest common sources are wheat germ, natto (fermented soybeans), mushrooms, aged cheese, peas and whole grains. A typical Western diet delivers roughly 10–15mg per day; supplements add a defined amount on top — our Spermidine 10mg Capsules provide 10mg per serving, a high strength for the UK market.

Why it's researched in longevity

Spermidine is studied in the context of autophagy — the cell's routine housekeeping process of clearing and recycling damaged components — which is itself a central topic in ageing biology. To be direct: this is an active research field, and no health claims are authorised for spermidine in the UK. What can be said plainly is that it is a naturally occurring dietary compound, intake declines matter to researchers, and it is among the most-studied food-derived molecules in the longevity space.

Wheat-germ extract vs synthesised

Most supplements use wheat-germ extract standardised for spermidine content — check the label states the actual spermidine milligrams, not just the extract weight. A “1000mg wheat germ extract” capsule may contain only 1mg of spermidine. Dose transparency is the single biggest quality signal in this category.

How it fits a longevity stack

Spermidine is commonly run alongside NAD+ precursors — they address different research areas (polyamines vs NAD+ metabolism) and are taken at different points: spermidine is often taken in the evening, NMN in the morning. See the complete NMN guide for the other half of the stack.

Shop NAD+ & longevity supplements →

Frequently asked questions

Is spermidine vegan?

Wheat-germ-derived spermidine is plant-based. Check the capsule shell — ours are 100% vegan.

Is spermidine gluten-free?

Wheat-germ extracts may contain traces of gluten. If you are coeliac or gluten-sensitive, check the specific product's allergen statement before buying.

How much spermidine per day?

UK products typically provide 1–10mg daily. Follow your product's label and do not exceed the stated dose.

Who should not take spermidine?

Not suitable for under-18s or for women who are pregnant or breastfeeding. If you take medication or have a medical condition, speak to your doctor before use.

Keep reading

NMN Supplements UK: The Complete Guide · NMN vs NR · How to take NMN

This guide is for general information only and does not constitute medical advice. Spermidine products are food supplements, not medicines — they are not intended to diagnose, treat, cure or prevent any disease.