Quick Answer
Butyrate (butyric acid) is a short-chain fatty acid your gut bacteria make from fiber. It's the main fuel for the cells lining your colon and helps maintain the gut barrier. Most people should build it through fiber and resistant starch first; a butyrate supplement can help when fiber triggers symptoms or the gut needs extra support.
A Nutritionist's Take
"Your gut bacteria are supposed to make butyrate from fiber, but with overgrowths that process often isn't smooth. People get scared of fiber and end up in a negative feedback loop. Supplementing butyrate can break that loop; the goal is a gut that makes it on its own."
— Jordan Dorn, Certified Nutritionist
Most gut health advice stops at probiotics. Take the good bacteria, eat some yogurt, done. But the bacteria themselves are only half the story. What really matters is what they make, and one of the most important things they make is butyrate.
Butyrate is the fuel the cells lining your colon run on. When there's plenty of it, your gut lining stays strong and digestion tends to feel calm. When there isn't, things start to break down. Here's the problem I see over and over: the people who need butyrate most are often the ones who can't make it well, because the fiber their bacteria need to produce it makes them bloated and uncomfortable. So they avoid fiber, make even less butyrate, and stay stuck.
In this article, I'll cover what butyrate actually does, the foods that help your body make more of it, how the different supplement forms compare, and how to tell whether you need a supplement or just more of the right fiber.
In this article 10 sections
What Is Butyrate (Butyric Acid)?
Butyrate is a short-chain fatty acid (SCFA). When beneficial bacteria in your colon ferment fiber, they produce three main SCFAs: acetate, propionate and butyrate. Butyrate is the one your colon cells, called colonocytes, prefer as their main energy source [1]. Butyric acid and butyrate are essentially the same compound; "butyrate" is the form it takes in the body and in most supplements.
A small amount of butyrate also comes directly from food, mainly butter and ghee, which is where the name comes from (the Greek word for butter). But the amount in food is small compared to what a healthy gut produces itself.
How Your Gut Makes Butyrate
Butyrate production depends on two things: the right bacteria and the right fuel. Bacteria such as Faecalibacterium prausnitzii, Roseburia and Eubacterium rectale are among the main butyrate producers. They feed on fermentable fiber and resistant starch that your small intestine can't digest, which reach the colon intact.
That's why butyrate is really a team effort between your diet and your microbiome. If either piece is missing, production drops. Prebiotic fibers like the arabinogalactan in larch are a gentle way to feed these bacteria, and a well-chosen probiotic can help rebuild the community that makes butyrate.
Butyrate Benefits
Here's what the research supports, with the strength of the evidence labeled:
Fuels the colon lining (well established). Butyrate is the preferred energy source for colonocytes, which keeps the single-cell-thick lining of your colon healthy and renewing [1].
Supports the gut barrier (strong lab and animal evidence). Butyrate helps maintain the tight junctions between gut cells, the "seals" that keep the barrier selective about what gets through. That's why it comes up so often in conversations about leaky gut [1][2].
Helps balance gut inflammation (lab, animal and early human evidence). Butyrate has well-documented anti-inflammatory effects on the gut lining in research settings [2].
May ease IBS symptoms (human trial). In a placebo-controlled trial, people with IBS who took microencapsulated butyrate had significantly less frequent abdominal pain after 12 weeks than those on placebo [3]. That's one of the stronger human results for a gut supplement, though more trials are needed.
Supports regularity and comfort (mechanistic plus customer reports). By fueling a healthy colon lining and microbiome, butyrate supports comfortable, regular digestion.
Foods High in Butyrate (and Foods That Help You Make It)
Very few foods contain butyrate directly. The real strategy is eating the fibers your bacteria turn into butyrate:
Direct sources: butter and ghee from grass-fed cows, and some aged cheeses like Parmesan. They contain small amounts of butyric acid.
Resistant starch: cooked-and-cooled potatoes and rice, slightly green bananas, oats, and legumes like lentils and beans. Cooling cooked starches increases their resistant starch.
Inulin and other prebiotic fibers: Jerusalem artichoke, chicory root, onions, leeks, garlic and asparagus.
Pectin-rich foods: apples, citrus and carrots.
One honest caveat: many of these foods are high-FODMAP. If you have SIBO or a sensitive gut, they may cause bloating at first. That's exactly the situation where a supplement can bridge the gap while you work up to more fiber. Our guide to getting rid of SIBO naturally covers how to approach that.
Food First or Supplement? How to Decide
For most people, fiber comes first. If your digestion handles fiber well, gradually adding resistant starch and prebiotic foods is the most sustainable way to raise butyrate.
A supplement makes more sense when:
Fiber consistently causes bloating, gas or pain, so you've been avoiding it.
You're dealing with an overgrowth like SIBO or candida, or several gut issues at once.
You're in the repair phase after a cleanse or a round of antibiotics and want to support the gut lining directly.
In those cases, providing butyrate directly can get things back on track while you slowly reintroduce fiber. The goal isn't to take it forever. Long term, you want a gut that makes plenty of butyrate on its own.
Butyrate Supplement Forms Compared
Sodium butyrate is common and inexpensive, but it adds sodium, which matters if you're watching your intake.
Calcium/magnesium butyrate delivers butyrate bound to calcium and magnesium instead of sodium. That's the form we use in our Butyric Acid supplement, a micronized, vegan Cal-Mag butyrate.†
Tributyrin is three butyrate molecules attached to a glycerol backbone. Digestive enzymes release the butyrate gradually, and it has less of the characteristic smell.
Whichever form you choose, look for third-party testing and clear labeling of how much actual butyrate each capsule provides.
What Customers Report
As of October 2026, our Butyric Acid has 59 customer reviews averaging 4.9 out of 5: 56 five-star, 2 four-star, 0 three-star, 1 two-star and 0 one-star. Several reviewers describe easier bowel movements and less bloating, often alongside probiotics, prebiotics or colostrum. Not every comment was positive: one reviewer said it was too expensive and slow to arrive, and another found one capsule a day suited her better than two. Results vary.
How to Take Butyrate
Follow your product's label and start at the low end. Taking butyrate with food helps some people tolerate it better. Give it a few weeks before judging results, since the gut lining renews over time. Many people pair it with a probiotic and a gentle prebiotic like arabinogalactan; our GI Health & Gut Lining Support Protocol combines Butyric Acid, Arabinogalactan, Colostrum and our Multi-Strain Probiotic for that reason.†
Why Does Butyric Acid Smell?
Butyric acid has a strong, cheesy smell. It's the same compound behind the aroma of Parmesan and rancid butter. A noticeable smell when you open a bottle is normal and doesn't mean the product has gone bad. Capsules keep the taste out of the picture.
Side Effects and Safety
Butyrate is generally well tolerated. The most common issues are temporary digestive changes, like mild gas or looser stools, when you start. Starting with a lower dose usually helps. If you have kidney disease, are pregnant or breastfeeding, or take prescription medications, check with your healthcare provider first. Persistent digestive symptoms, blood in the stool or unexplained weight loss always deserve a medical workup rather than a supplement.
The Bottom Line
Butyrate is where gut bacteria and gut lining meet. Feed your microbiome the fiber it needs to make butyrate, and if fiber is the very thing your gut can't handle right now, a butyrate supplement can break that cycle while you rebuild. The long-term goal is always a gut that does this job on its own.
References
Hamer HM, et al. Review article: the role of butyrate on colonic function. Aliment Pharmacol Ther. 2008;27(2):104–119. PMID 17973645
Canani RB, et al. Potential beneficial effects of butyrate in intestinal and extraintestinal diseases. World J Gastroenterol. 2011;17(12):1519–1528. PMID 21472114
Banasiewicz T, et al. Microencapsulated sodium butyrate reduces the frequency of abdominal pain in patients with irritable bowel syndrome. Colorectal Dis. 2013;15(2):204–209. PMID 22738315
