Spermidine Foods: Top Dietary Sources and How Much You Need

Top Dietary Sources of Spermidine

1. Wheat germ

Wheat germ is the most concentrated common food source of spermidine, typically containing 24-35 mg per 100 grams. A single tablespoon (about 7-8 grams) provides roughly 2-2.5 mg of spermidine. Wheat germ is also a notable source of vitamin E, folate, zinc, and healthy fats. It can be added to cereals, yogurt, smoothies, or baked goods as a practical way to increase dietary spermidine.

2. Soybeans and soy products

Whole soybeans, edamame, and fermented soy products (including natto, tempeh, and miso) are substantial spermidine sources. Natto, the Japanese fermented soybean product, is particularly rich in polyamines due to bacterial fermentation. Soybeans in various forms provide 6-15 mg of spermidine per 100 grams, with fermented forms generally at the higher end of this range.

3. Aged cheese

Aged hard cheeses, including cheddar, Parmesan, and Gruyere, accumulate spermidine through the fermentation and aging process. Values vary significantly by cheese type and aging duration. Cheddar aged over 12 months may contain 4-20 mg per 100 grams. This makes aged cheese one of the more accessible spermidine sources in Western diets, though the caloric density and sodium content of cheese are relevant considerations for regular consumption.

4. Mushrooms

Certain mushroom species are good spermidine sources. Oyster mushrooms and shiitake mushrooms are among the richer sources within this category, containing roughly 5-10 mg per 100 grams. Dried mushrooms are more concentrated than fresh. Mushrooms also provide B vitamins, selenium, and beta-glucans with independent health relevance.

5. Legumes

Lentils, chickpeas, peas, and other legumes provide moderate spermidine along with substantial fiber, plant protein, and iron. Values are typically 2-8 mg per 100 grams depending on variety and preparation. Legumes have a well-established evidence base for cardiovascular and metabolic benefits independent of their spermidine content, making them a valuable inclusion in any dietary pattern.

6. Corn and whole grains

Whole corn and other whole grains contain polyamines at moderate levels. Among grains, wheat germ (described above) is the standout, but whole corn, millet, and brown rice provide smaller but still meaningful contributions to total dietary spermidine.

7. Broccoli and cruciferous vegetables

Broccoli, cauliflower, and Brussels sprouts provide modest amounts of spermidine, generally in the 2-5 mg per 100 gram range. Their inclusion in a spermidine-conscious dietary pattern is complementary given their extensive evidence base for other health-relevant phytonutrients.

Spermidine Content: a Reference List

• Wheat germ — 24-35 mg/100g
• Natto (fermented soybeans) — 11-20 mg/100g
• Aged cheddar — 4-20 mg/100g
• Soybeans (cooked) — 6-12 mg/100g
• Oyster mushrooms — 5-10 mg/100g
• Lentils (cooked) — 2-8 mg/100g
• Broccoli — 2-5 mg/100g
• Peas — 2-5 mg/100g
• Corn — 1-4 mg/100g

Values are approximate. Spermidine content varies by cultivar, growing conditions, processing, and storage. These figures are drawn from published food composition analyses and should be treated as rough estimates.

How Much Spermidine Do You Need?

There is no established dietary reference intake (DRI) for spermidine. Estimates of average Western dietary intake range from approximately 7-15 mg/day. Population-level observational studies examining spermidine intake and health outcomes, including a notable study of older adults in Austria, have associated higher dietary spermidine intake (above approximately 11.6 mg/day) with reduced cardiovascular mortality. However, these are associations from observational cohorts, not causally established effects.

Spermidine supplements typically provide 1-5 mg per dose (often as wheat germ extract). Whether supplementation adds benefit beyond adequate dietary intake in healthy adults has not been established in large-scale clinical trials.

Testing Biomarkers Relevant to Cellular Health and Longevity

Spermidine itself is not a routinely measured clinical biomarker. However, several markers tested through standard blood panels are relevant to the cellular health pathways that spermidine research intersects.

• hs-CRP — Systemic inflammation; reduced inflammation is associated with better autophagy function
• Fasting insulin — Metabolic health; insulin signaling interacts with autophagy regulation
• Homocysteine — Methylation status and vascular health; spermidine interacts with one-carbon metabolism
• Lipoprotein(a) — Cardiovascular risk; relevant in the context of spermidine's studied cardiovascular associations

Superpower's Baseline Blood Panel covers inflammation, metabolic health, and cardiovascular markers in a single draw, providing a meaningful baseline for anyone tracking longevity-relevant biomarkers over time.