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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.
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.
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.
FAQs
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.
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.
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.
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.
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.
References
- Kiechl, S., Pechlaner, R., Willeit, P., Notdurfter, M., Paulweber, B., Willeit, K., Werner, P., Ruckenstuhl, C., Iglseder, B., Weger, S., Mairhofer, B., Gartner, M., Kedenko, L., Chmelikova, M., Stekovic, S., Stuppner, H., Oberhollenzer, F., Kroemer, G., Mayr, M., ... Willeit, J. (2018). Higher spermidine intake is linked to lower mortality: a prospective population-based study. The American journal of clinical nutrition, 108(2), 371-380. https://doi.org/10.1093/ajcn/nqy102
- Mohajeri, M., Ayatollahi, S. A., Kobarfard, F., Goli, M., Khandan, M., Mokhtari, S., & Khodadoost, M. (2023). Wheat germ, a byproduct of the wheat milling industry, as a beneficial source of anti-aging polyamines: A quantitative comparison of various forms. Food science & nutrition, 11(11), 7242-7254. https://doi.org/10.1002/fsn3.3650
- Schwarz, C., Stekovic, S., Wirth, M., Benson, G., Royer, P., Sigrist, S. J., Pieber, T., Dammbrueck, C., Magnes, C., Eisenberg, T., Pendl, T., Bohlken, J., Köbe, T., Madeo, F., & Flöel, A. (2018). Safety and tolerability of spermidine supplementation in mice and older adults with subjective cognitive decline. Aging, 10(1), 19-33. https://doi.org/10.18632/aging.101354
- Muñoz-Esparza, N. C., Costa-Catala, J., Comas-Basté, O., Toro-Funes, N., Latorre-Moratalla, M. L., Veciana-Nogués, M. T., & Vidal-Carou, M. C. (2021). Occurrence of Polyamines in Foods and the Influence of Cooking Processes. Foods (Basel, Switzerland), 10(8). https://doi.org/10.3390/foods10081752
- Hofer, S. J., Daskalaki, I., Bergmann, M., Friščić, J., Zimmermann, A., Mueller, M. I., Abdellatif, M., Nicastro, R., Masser, S., Durand, S., Nartey, A., Waltenstorfer, M., Enzenhofer, S., Faimann, I., Gschiel, V., Bajaj, T., Niemeyer, C., Gkikas, I., Pein, L., ... Madeo, F. (2024). Spermidine is essential for fasting-mediated autophagy and longevity. Nature cell biology, 26(9), 1571-1584. https://doi.org/10.1038/s41556-024-01468-x
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