Community Consensus
Community Consensus
Reader sentiment on the compounds this article compares. Votes count toward each compound's own tally.
- Spermidine1.3k votes · 87%👍
Reader sentiment only. Not medical advice, not a recommendation, and not a measure of evidence quality.
Quick answer
Wheat germ is the richest common dietary source of spermidine at roughly 20 to 25 mg per 100 g, followed by dried soybeans and natto, well-aged cheese such as mature cheddar and parmesan, mushrooms, chicken liver, green peas and other legumes, then a long tail of vegetables and whole grains in the low single digits per 100 g. Two things make food the more interesting route than a capsule. Spermidine is heat-stable, so ordinary cooking does not destroy it the way it destroys sulforaphane, and fermentation actually raises polyamine content, which is why natto and aged cheese rank so high. And normal portions add up fast: two tablespoons of wheat germ, a serving of mushrooms and 30 g of parmesan is comfortably 10 mg, which exceeds what most spermidine supplements supply and sits in the intake range the Bruneck population study associated with lower all-cause mortality. Published food polyamine figures vary widely with cultivar, ripeness and ageing time, so treat all values as orders of magnitude.
Key takeaways
- Wheat germ leads the list at roughly 20 to 25 mg of spermidine per 100 g, so a 15 g serving supplies 3 to 4 mg.
- Dried soybeans and natto, aged cheese, mushrooms, chicken liver and green peas are the other strong sources.
- Spermidine is heat-stable. Ordinary cooking does not destroy it, unlike sulforaphane, which depends on a fragile enzyme.
- Fermentation and ageing increase polyamine content, which is why natto and mature cheese outrank their fresh equivalents.
- The main cooking loss is leaching into boiling water, so soups and steaming retain more than water you pour away.
- Total dietary intake in Western populations is roughly 7 to 15 mg a day, with Mediterranean patterns at the higher end.
- In the Bruneck cohort of 829 adults, the top intake tertile at around 11 mg a day or more had lower all-cause mortality than the bottom tertile at around 6 mg. That is an association, not proof of cause.
- People eating more spermidine are also eating more legumes, vegetables and whole grains, so the polyamine cannot be separated from the pattern.
- Wheat germ is high in polyunsaturated oil and goes rancid quickly. Refrigerate it after opening and discard it if it smells sharp.
- Wheat germ contains gluten, which rules it out for coeliac disease and wheat allergy along with most wheat germ extract supplements.
- Aged cheese is high in spermidine and also high in histamine and tyramine, which matters for histamine intolerance and for anyone on a monoamine oxidase inhibitor.
- Food delivers more spermidine than a typical supplement, costs nothing extra, and is the only version with any human outcome data behind it.
The short answer
Wheat germ is the richest common food source of spermidine, at roughly 20 to 25 mg per 100 g. After that come dried soybeans and natto, well-aged cheese, mushrooms, chicken liver, green peas and other legumes, and then a long tail of vegetables and whole grains in the low single digits per 100 g.
Two things make food the more interesting route here. Spermidine is heat-stable, so unlike sulforaphane it does not need protecting from your cooking. And ordinary portions of the top foods deliver amounts that compare well with, and often exceed, what spermidine supplements supply.
The catch is that published polyamine figures vary widely between analyses, because content depends on cultivar, ripeness, how long a cheese was aged and how a soybean was fermented. Treat every number below as an order of magnitude, not a nutrition label.
How much spermidine is in food
These are approximate values drawn from published food polyamine analyses, expressed per 100 g of the food as eaten.
| Food | Spermidine, approx. mg per 100 g | Realistic portion | Approx. per portion |
|---|---|---|---|
| Wheat germ | 20 to 25 | 15 g, two tablespoons | 3 to 4 mg |
| Dried soybeans | ~20 | 40 g dry | ~8 mg |
| Aged cheese (mature cheddar, parmesan) | Up to ~20, highly variable | 30 g | up to ~6 mg |
| Natto | ~9 to 12 | 50 g pack | ~5 mg |
| Mushrooms | ~9 | 80 g | ~7 mg |
| Chicken liver | ~5 to 10 | 60 g | ~4 mg |
| Green peas | ~5 | 80 g | ~4 mg |
| Mango | ~3 | 150 g | ~4 mg |
| Broccoli, cauliflower | ~2 to 3 | 100 g | ~2 to 3 mg |
| Whole grain bread | ~1 to 3 | 60 g, two slices | ~1 to 2 mg |
⚠ CLAIM (wellness): Wheat germ is the richest widely available dietary source of spermidine, at roughly 20 to 25 mg per 100 g, with dried soybeans, aged cheese, natto and mushrooms next. Basis: published food polyamine analyses, Ali 2011 and Munoz-Esparza 2019. Lane: wellness-guidance.
Put a normal day together from that table and it adds up quickly. Two tablespoons of wheat germ, a portion of mushrooms and 30 g of parmesan is comfortably 10 mg, which is in the range the population research associates with lower mortality, and above what most spermidine supplements supply.
What a normal diet delivers
Estimated total dietary spermidine intake in Western populations lands somewhere around 7 to 15 mg a day, with Mediterranean eating patterns at the higher end because of the legumes, vegetables, mushrooms and aged cheese in them.
The study that put spermidine on the map, the Bruneck cohort in northern Italy, followed 829 people for two decades and compared intake tertiles. The top third, eating roughly 11 mg a day or more, had lower all-cause mortality than the bottom third at around 6 mg. The authors put the size of the gap between top and bottom tertile at roughly the same as a five-year difference in age.
⚠ CLAIM (wellness): In the Bruneck prospective cohort of 829 adults followed for 20 years, higher dietary spermidine intake was associated with lower all-cause mortality, with the top intake tertile at roughly 11 mg per day or more. This is an observational association and does not establish that spermidine caused the difference. Basis: Kiechl 2018, American Journal of Clinical Nutrition. Lane: wellness-guidance.
That last sentence carries a lot of weight. People who eat more spermidine are eating more legumes, vegetables, mushrooms and whole grains, which is a description of a better diet in general. Nobody has run a trial that separates the polyamine from the pattern, so food-first is the honest recommendation for a reason beyond cost: it is the only version of this that has any human outcome data behind it at all.
Does cooking destroy spermidine?
Mostly no, and this is where spermidine differs from the compounds it usually gets grouped with. Spermidine is a small, stable, water-soluble amine with no fragile enzyme system attached to it, so it survives normal cooking temperatures. There is nothing here resembling the myrosinase problem that makes sulforaphane so easy to destroy.
The realistic losses are physical rather than chemical. Boiling leaches water-soluble compounds into the water, so soups, stews and steaming keep more than a pot of water you pour down the sink. Beyond that, cook normally.
Fermentation goes the other way and raises polyamine content, because microbes produce polyamines as they grow. That is exactly why natto, aged cheese and other fermented and matured foods sit near the top of the table, and why a young cheddar and a three-year-old one are not the same food for this purpose.
Wheat germ in practice
Wheat germ is the embryo of the wheat kernel, removed during the milling of white flour, and sold as a loose flake or a coarse powder. It is cheap, it tastes mildly nutty, and it goes into porridge, yoghurt, smoothies and baking without much thought.
Two practical notes. It is rich in polyunsaturated oil, which means it goes rancid quickly. Buy it in a size you will finish, keep it in the fridge or freezer after opening, and throw it out if it smells like old paint. And it is wheat, so it contains gluten. If you have coeliac disease or a wheat allergy, wheat germ is not an option for you and neither, in most cases, is the standard wheat-germ-extract supplement.
Foods that are not the shortcut they look like
A few sources come up constantly and deserve a caveat rather than a place on a shopping list.
- Aged cheese is genuinely high in spermidine, but it is also high in histamine and tyramine. People with histamine intolerance, and anyone taking a monoamine oxidase inhibitor, have a good reason to be careful with exactly the foods that top this list.
- Chicken liver is a strong source but also extremely high in preformed vitamin A, which has a real upper limit and matters in pregnancy in particular.
- Soy and natto are excellent sources. Natto is fermented with Bacillus subtilis and is also very high in vitamin K2 as MK-7, which is relevant to anyone taking warfarin.
- Corn, orange juice and green tea appear on aggregated lists because they contain polyamines, but the polyamine in question is often putrescine rather than spermidine. The three are not interchangeable.
Food or a capsule?
| Food | Supplement | |
|---|---|---|
| Typical spermidine delivered | 7 to 15 mg a day across a whole diet | 1 to 6 mg per serving |
| Human outcome evidence | Observational, but it exists | Two small trials, one positive on one measure, one null at twelve months |
| Dose certainty | Poor, content varies by cultivar and ageing | Better, if the label is verified |
| Comes with | Fibre, protein, micronutrients, a better diet overall | A capsule |
| Cost | Negligible | Meaningful, monthly, indefinitely |
The case for a supplement is dose certainty and convenience, and for people who cannot or will not eat wheat germ, mushrooms and aged cheese, it is a reasonable thing to reach for. The case for food is that it delivers more spermidine, costs nothing extra, and is the only version with any human outcome data attached to it. For most people the sensible order is food first, supplement as a top-up if you want one, which is the same conclusion reached in the mitochondrial supplements pillar.
The bottom line
Wheat germ, soybeans and natto, aged cheese, mushrooms, legumes and green peas will move your spermidine intake further than a capsule will, and cooking will not undo it. Refrigerate the wheat germ, watch the histamine load if aged cheese is your main source, and remember that the only human evidence linking spermidine to anything worth having came from measuring what people ate, not what they supplemented.
Educational information only, not medical advice, and not evaluated by the FDA. Spermidine is not a treatment for any disease and dietary associations do not establish cause. Wheat germ contains gluten. Talk to a clinician before making large dietary changes if you are pregnant or breastfeeding, take a monoamine oxidase inhibitor or warfarin, have histamine intolerance, or have coeliac disease or a wheat allergy.
Frequently asked questions
What foods are highest in spermidine?
Wheat germ is the clear leader among widely available foods, at roughly 20 to 25 mg per 100 g. Dried soybeans are close behind at around 20 mg per 100 g, as is well-aged cheese such as mature cheddar or parmesan, though cheese values vary enormously with ageing time. Natto sits around 9 to 12 mg per 100 g, mushrooms around 9 mg, chicken liver somewhere between 5 and 10 mg, and green peas around 5 mg. Mango, broccoli, cauliflower and whole grain bread contribute in the low single digits. Published figures differ between analyses because content depends on cultivar, ripeness and processing, so treat these as approximations.
Does cooking destroy spermidine?
Not in any meaningful way. Spermidine is a small, stable, water-soluble amine with no fragile enzyme system attached to it, so it tolerates normal cooking temperatures. This is a real point of difference from sulforaphane, where the myrosinase enzyme that generates it is destroyed by heat and technique genuinely matters. The realistic loss with spermidine is physical rather than chemical: boiling leaches water-soluble compounds into the cooking water, so soups, stews and steaming retain more than boiling and draining. Fermentation goes the other way and increases polyamine content, because the microbes produce polyamines as they grow.
How much spermidine do people eat in a day?
Estimates for Western diets land somewhere around 7 to 15 mg a day, with Mediterranean eating patterns at the higher end because of the legumes, vegetables, mushrooms and aged cheese they contain. For context, the Bruneck cohort study divided its 829 participants into intake tertiles, with the top group at roughly 11 mg a day or more and the bottom group at around 6 mg. Most people are therefore already somewhere in the studied range without doing anything deliberate, which is a useful thing to know before buying a 2 mg capsule.
Is wheat germ the best way to get spermidine?
It is the most concentrated and cheapest way, and it is also the raw material behind almost every spermidine supplement, so it is a direct substitute rather than an inferior one. Two tablespoons stirred into yoghurt, porridge or a smoothie supplies 3 to 4 mg, which is at or above most supplement doses. Two practical caveats. Wheat germ is rich in polyunsaturated oil and turns rancid quickly, so buy small quantities and keep it refrigerated after opening. And it is wheat, so it contains gluten and is not an option for coeliac disease or wheat allergy.
Do spermidine foods actually extend lifespan?
No human study has shown that. What exists is an association: in a prospective cohort of 829 adults in northern Italy followed for two decades, people in the highest tertile of dietary spermidine intake had lower all-cause mortality than those in the lowest, and the authors compared the size of that gap to roughly a five-year difference in age. Associations of this kind cannot separate the compound from the diet that carries it, and people eating more spermidine are eating more legumes, vegetables, mushrooms and whole grains generally. The animal evidence for lifespan extension is much stronger but it is in yeast, flies and mice.
Is aged cheese a good spermidine source?
It is one of the richest, and the longer the ageing the higher the content, because the maturation microbes generate polyamines as they go. That is also the problem with relying on it. The same ageing process raises histamine and tyramine, so aged cheese is exactly the food people with histamine intolerance are told to avoid, and tyramine matters for anyone taking a monoamine oxidase inhibitor. If cheese is your main spermidine source and you get headaches, flushing or congestion after eating it, that is worth taking seriously rather than pushing through.
Are polyamines and spermidine the same thing?
Spermidine is one of three main dietary polyamines, alongside putrescine and spermine, and they are chemically related but not interchangeable. Your body converts putrescine to spermidine and spermidine to spermine, and food contains all three in varying ratios. This matters when reading food lists, because several foods that appear on aggregated polyamine tables, including corn, orange juice and green tea, are high in putrescine rather than spermidine specifically. A food ranked highly for total polyamines is not necessarily a good spermidine source.
Should I eat spermidine foods or take a supplement?
Food first is the defensible answer. A normal diet built around wheat germ, legumes, mushrooms and aged cheese delivers 7 to 15 mg a day, while typical supplements supply 1 to 6 mg per serving, and the human evidence that made spermidine interesting came from measuring what people ate rather than what they supplemented. A supplement makes sense for dose certainty, for convenience, or for people who cannot eat the top food sources, and for anyone with coeliac disease the wheat germ route is closed anyway. It is a reasonable top-up rather than a replacement for the eating pattern.
References
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- 3.Kiechl S, Pechlaner R, Willeit P, et al. Higher spermidine intake is linked to lower mortality: a prospective population-based study. Am J Clin Nutr. 2018;108(2):371-380.
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- 9.Schwarz C, Horn N, Benson G, et al. Effects of spermidine supplementation on cognition and biomarkers in older adults with subjective cognitive decline (SmartAge): a randomized clinical trial. JAMA Netw Open. 2022;5(5):e2213875.
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