Gut Barrier Health: Are You Overlooking this Antioxidant?
If you want a healthy gut barrier, you’ve probably heard plenty about probiotics, fiber, and fermented foods. But researchers are also looking at a lesser-known compound that may help the intestinal lining handle oxidative stress: ergothioneine.
Found naturally in foods like mushrooms, ergothioneine stands out because your body has a dedicated system to absorb and retain it. Even more interesting? The gut may be just the beginning of its story.
What Is the Gut Barrier?
The gut barrier is the protective boundary between the contents of your digestive tract and the rest of your body. It includes intestinal cells, the tight junctions holding those cells together, and a protective mucus layer.
Together, these components create a selective barrier: nutrients can cross into circulation, while microbes, toxins, and other unwanted substances are kept out. But this protective lining faces a steady stream of challenges, including inflammation and oxidative stress.
Oxidative stress can interfere with this system by damaging intestinal cells and disrupting tight junctions. When intestinal permeability increases, sometimes called “leaky gut,” substances that would normally stay inside may be able to pass through more easily than they should.
Ergothioneine for Gut Health and Beyond
Ergothioneine is an amino acid well-studied for its antioxidant and cell-protective properties. Unlike many antioxidants, your body has a dedicated transporter, OCTN1/SLC22A4, which moves it into cells.
That transporter is highly expressed in the small intestine. And that makes the gut important to ergothioneine in two distinct ways:
It May Help Protect the Gut Barrier Under Stress
In mice with experimentally induced colitis, ergothioneine helped restore the intestinal mucus layer and increased levels of occludin, a protein that helps form tight junctions between intestinal cells. Newer preclinical findings point to similar effects on other proteins involved in barrier integrity.
Animal research has also found that ergothioneine helped preserve intestinal structure and goblet cells, which produce protective mucus, during severe oxidative injury.
However, human studies are still needed to determine whether ergothioneine provides the same gut barrier benefits in people.
It Relies on the Gut to Reach the Rest of the Body
Ergothioneine’s specialized transporter helps it move across the small intestine and into circulation, where it can be taken up and retained in tissues throughout the body.
Ergothioneine tends to accumulate in tissues particularly vulnerable to oxidative stress, including the blood, liver, kidneys, eyes, and brain.
That distribution may help explain why researchers are studying ergothioneine beyond gut health to longevity and healthy aging. Lower blood levels have been linked with faster cognitive decline in older adults, while higher levels have been associated with a lower risk of all-cause mortality.
Give Your Gut Barrier More Support
Your body is remarkably good at absorbing and retaining ergothioneine. But it can’t make it. Mushrooms are the richest dietary source, with smaller amounts found in foods such as tempeh, oats, and some meats. Ergothioneine is also available in supplemental form for a more concentrated, consistent amount.
Still, ergothioneine is only one piece of the gut barrier puzzle. Give your gut microbes plenty of fiber from foods like vegetables, fruit, legumes, nuts, and whole grains.
Don’t overlook what’s happening outside your diet either: stress may also influence intestinal permeability, so make room for whatever helps you decompress, whether that’s a daily walk, yoga, meditation, or simply more downtime.
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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