What is the best food source of spermidine?

Wheat germ contains the highest spermidine concentration of any commonly available food, at approximately 24-35 mg per 100 grams. Natto (fermented soybeans) and aged cheese are also rich sources. For practical daily intake, adding wheat germ to cereals or smoothies and including legumes, mushrooms, and aged cheese regularly provides a meaningful dietary spermidine load without supplementation.

Does cooking destroy spermidine?

Spermidine is relatively heat-stable, and cooking does not eliminate it entirely. Some reduction occurs with prolonged high-heat cooking, but steaming, lightly cooking vegetables, and standard food preparation methods preserve a meaningful proportion of food spermidine. Fermentation, as in aged cheese and natto, can increase spermidine content relative to the unfermented food.

Does fasting increase spermidine?

Fasting and caloric restriction have been shown to increase endogenous spermidine synthesis in animal models, and this is thought to contribute to autophagy induction during fasting periods. Whether this effect is meaningful in the context of intermittent fasting protocols in humans, and whether it requires dietary spermidine supplementation alongside fasting, remains an open research question.

Spermidine Foods: Top Sources and How Much You Need

Creator: Superpower
Published: 2026-04-04

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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.

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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, providing a meaningful baseline for anyone tracking longevity-relevant biomarkers over time.

This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making changes to your health routine. Superpower offers blood panels that include the biomarkers discussed in this article. Links to individual tests are provided for informational context.

Frequently Asked Questions

At food-derived amounts, no safety concerns have been identified. At supplemental doses studied in humans (typically 1-5 mg of concentrated extract per day), spermidine appears well tolerated. However, isolated spermidine at very high doses has not been extensively studied for long-term safety in humans. Dietary sources are considered the most conservative approach given the current evidence base.

The simplest approach is adding one to two tablespoons of wheat germ daily to cereal, yogurt, or smoothies — that alone provides roughly 2-5 mg of spermidine. Beyond that, regularly including aged cheese, mushrooms (especially shiitake and oyster varieties), legumes, and fermented soy products like natto or tempeh builds a consistently higher baseline. A Mediterranean-style dietary pattern naturally tends to be higher in polyamine content overall.

Yes. Polyamine content in cheese increases with fermentation and aging duration. A young cheddar contains meaningfully less spermidine than one aged over 12 months. Parmesan, Gruyere, and other long-aged hard cheeses tend to have the highest concentrations. The bacterial activity during aging produces polyamines as a byproduct, which is why fermented foods generally contain more spermidine than their unfermented counterparts.

The observational studies that first linked spermidine to reduced mortality measured dietary intake, not supplemental intake. This suggests that food-derived spermidine is biologically relevant. Supplements offer a standardized and concentrated dose, but food sources provide spermidine alongside fiber, vitamins, and other bioactive compounds that may contribute to the overall health associations observed. The two are not mutually exclusive, but food-first is a well-supported approach.

No specific foods have been shown to lower circulating spermidine levels. However, the body's endogenous spermidine production naturally declines with age, and diets low in polyamine-containing foods (highly processed, low in legumes, whole grains, and fermented products) would contribute less dietary spermidine to the total pool. Maintaining a varied, whole-food-based diet is the most practical way to support adequate polyamine intake.