8 Foods High in Ergothioneine: The Best Dietary Sources of This Unique Antioxidant Compound

Ergothioneine is a naturally occurring antioxidant compound found overwhelmingly concentrated in mushrooms, with smaller amounts identified in a handful of other foods, that has drawn significant research interest for its potential role in protecting cells from oxidative stress. According to a review published in the National Library of Medicine’s PMC database, ergothioneine is unique among antioxidants because the human body has a dedicated transporter protein that actively absorbs and concentrates it in tissues most vulnerable to oxidative damage.

Because ergothioneine cannot be synthesized by humans or most other animals, it must be obtained entirely through diet, and mushrooms are by far the richest and most reliable dietary source. According to research on ergothioneine content across mushroom species, levels vary considerably by variety, with some types containing many times more than others, though nearly all mushrooms provide meaningfully more ergothioneine than any other food category.

Ergothioneine and Oxidative Stress

Ergothioneine is believed to accumulate in tissues that experience high levels of oxidative stress, including the liver, kidneys, eyes, and bone marrow. According to the National Library of Medicine, this targeted accumulation, made possible by a specific cellular transporter, has led researchers to investigate ergothioneine’s potential role in supporting the body’s natural defenses against oxidative damage, though human clinical research remains in earlier stages compared to more established antioxidants like vitamin C and vitamin E.

How Ergothioneine Was Discovered and Studied

Ergothioneine was first identified over a century ago in ergot fungus, which is how it received its name, though it was later found in much higher concentrations in edible mushrooms. According to the National Library of Medicine, interest in ergothioneine has grown substantially in more recent decades after researchers discovered the dedicated transporter protein, called OCTN1, that allows the body to actively absorb and retain it, a feature that sets ergothioneine apart from most other dietary antioxidants and has helped drive the current wave of scientific interest in its potential health roles.

Ergothioneine Beyond Mushrooms

While mushrooms remain by far the richest dietary source, researchers have identified smaller amounts of ergothioneine in certain other foods, including some legumes and organ meats. According to research on ergothioneine food content, these non-mushroom sources generally provide only a small fraction of what a typical serving of mushrooms contains, which is why nutrition researchers consistently point to mushrooms as the most practical and reliable way to increase dietary ergothioneine intake for most people.

1. Oyster Mushrooms

Among the highest common dietary sources of ergothioneine.

Best eaten: Sauteed, roasted, or added to stir-fries and soups.

2. Shiitake Mushrooms

A well-studied mushroom variety with substantial ergothioneine content.

Best eaten: Sauteed, grilled, or added to broths and stir-fries.

3. Maitake Mushrooms

One of the richest mushroom varieties tested for ergothioneine content.

Best eaten: Roasted, sauteed, or added to grain bowls.

4. Portobello Mushrooms

A widely available mushroom with meaningful ergothioneine content.

Best eaten: Grilled as a burger substitute, or roasted whole.

5. White Button Mushrooms

The most commonly consumed mushroom, providing a moderate but consistent ergothioneine source.

Best eaten: Raw in salads, or sauteed as a side dish.

6. Chicken Liver

One of the few non-mushroom foods identified as a notable ergothioneine source.

Best eaten: Pan-seared, or incorporated into pate.

7. Black Beans

A legume identified in research as containing trace but measurable ergothioneine.

Best eaten: In soups, burritos, or rice bowls.

8. Kidney Beans

Another legume with trace ergothioneine identified in food composition studies.

Best eaten: In chili, salads, or bean dishes.

Ergothioneine and Aging Research

Some researchers have proposed that declining ergothioneine levels with age, combined with its role in protecting vulnerable tissues from oxidative stress, may make it a nutrient worth watching in aging research. According to the National Library of Medicine, this remains an emerging area of study, and while some observational research has linked lower ergothioneine status to certain age-related conditions, this research does not yet establish that increasing intake changes health outcomes.

Ergothioneine Research and Supplementation

Ergothioneine supplements have become more available in recent years, often marketed for their antioxidant properties. According to the National Library of Medicine, while ergothioneine has a strong safety profile in the research conducted so far, the clinical evidence supporting supplementation for specific health outcomes remains limited compared to the interest it has generated, and whole mushrooms remain the best-supported way to increase intake for most people.

Quick Reference: All 8 Ergothioneine Sources at a Glance

5 Evidence-Based Tips for Getting Adequate Ergothioneine

• Eat mushrooms regularly. Mushrooms are by far the richest dietary source of ergothioneine identified in research.
• Choose a variety of mushroom types. Oyster, shiitake, and maitake mushrooms tend to contain the highest levels among common varieties.
• Cook mushrooms gently. Research suggests ergothioneine is relatively stable during cooking, so sauteing or roasting is fine.
• Don’t rely on other foods alone. Non-mushroom sources like beans and liver contain far less ergothioneine per serving.
• Talk to a provider before supplementing. Whole mushrooms remain the best-supported source given the still-developing supplement research.

Who Might Be Interested in Ergothioneine Rich Foods

People interested in antioxidant nutrition and emerging research on cellular protection against oxidative stress may find ergothioneine a compelling nutrient to learn more about, given its unique dedicated transport system in the body. Those curious about aging-related nutrition research should approach the topic with realistic expectations, since human clinical evidence remains in earlier stages. Anyone who already enjoys cooking with a variety of mushrooms can feel confident they are getting substantial ergothioneine as part of a flavorful, nutrient-dense diet.

The Bottom Line

Ergothioneine is a unique antioxidant compound concentrated almost entirely in mushrooms, with oyster, shiitake, maitake, portobello, and white button varieties standing out as the richest sources, followed by much smaller amounts in chicken liver, black beans, and kidney beans. Regularly including a variety of mushrooms in the diet remains the most reliable, well-supported way to increase ergothioneine intake.

This article is for informational purposes only and is not intended as medical advice. Nutrient values are approximate and sourced from USDA FoodData Central and the National Library of Medicine. Consult a healthcare provider or registered dietitian before making significant changes to your diet or starting any new supplement.

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