Ergothioneine Foods: The Nutrient Even a Healthy Diet May Miss
You probably won’t find ergothioneine listed on a Nutrition Facts label.
It doesn’t have an established daily value, and most people have never heard of it. Yet some researchers believe this naturally occurring amino acid is important enough to be considered a “longevity vitamin.”
There’s just one catch: Your body can’t make ergothioneine. You have to get it through food or supplements.
Let’s look at which ergothioneine foods provide the most and whether food alone can deliver a consistent amount.
What Is Ergothioneine?
Ergothioneine is an amino acid with antioxidant properties. It helps neutralize free radicals and protect cells from oxidative stress, an imbalance that can damage cellular structures and contribute to many of the changes associated with aging.
What makes ergothioneine unusual is how the body handles it. A dedicated transporter called OCTN1 helps absorb and distribute it throughout the body. Ergothioneine then accumulates in areas exposed to higher oxidative stress, including the brain, liver, kidneys, blood, eyes, and skin. It may also help protect the mitochondria, the structures within cells that produce energy.
Why Do Researchers Call Ergothioneine a Longevity Vitamin?
Ergothioneine has attracted attention because higher blood levels consistently appear alongside markers of healthier aging.
Small human studies have found lower levels in older adults with mild cognitive impairment, dementia, and Parkinson’s disease. In one five-year study, lower levels were associated with poorer cognitive performance at the start and faster decline across several areas of thinking and memory.
The pattern extends beyond the brain. In a study that tracked more than 3,200 adults for over 21 years, ergothioneine stood out among 112 measured metabolites as the one most strongly associated with a lower risk of cardiovascular disease and death.
These studies don’t prove that ergothioneine prevents disease or extends lifespan. But together, they suggest it may play a broader role in healthy aging than its low profile would lead you to expect.
Ergothioneine Foods: Which Sources Stand Out?
Mushrooms are by far the richest dietary source of ergothioneine because fungi are among the few organisms capable of producing it.
Oyster, porcini, shiitake, and maitake mushrooms tend to contain some of the highest amounts. Common varieties, including white button, cremini, and portobello mushrooms, also provide ergothioneine, although generally in lower concentrations.
Other ergothioneine foods include:
Tempeh
Asparagus
Garlic
Kidney beans
Chicken liver
Oats
Spirulina
Tempeh contains more ergothioneine than most non-mushroom foods because fungi are used during fermentation. The remaining sources on that list typically provide much smaller amounts.
Can You Get Enough Ergothioneine From Food?
Current estimates suggest Americans consume around 1.1 milligrams per day, compared with as much as 4.6 milligrams per day in some European countries. Much of that difference may come down to mushroom consumption.
Even if you regularly eat mushrooms, however, calculating your intake isn’t straightforward. Ergothioneine levels can vary considerably between mushroom species and even within the same variety. Growing medium, soil quality, location, and farming practices may all affect the final amount.
In other words, ergothioneine-rich foods can meaningfully contribute to your intake, but they don’t always provide a predictable amount.
When Targeted Ergothioneine Intake May Make Sense
Whole foods should remain the foundation of an antioxidant-rich diet. But a targeted supplement may be worth considering if you rarely eat mushrooms or want a more consistent source of ergothioneine.
Some ergothioneine supplements use MitoPrime®, a pure form of L-ergothioneine produced through a patented natural fermentation process.
There’s no official target for ergothioneine intake, so the best approach is one that helps you get it consistently through food, supplements, or both.
Devan Ciccarelli is a NASM-Certified Personal Trainer, Nutrition Coach, and Women's Fitness Specialist who writes on health and lives in Florida with her two kids.
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