Guide

Does ProButyrate work? Free butyric acid in a dextrin carrier, and the salt trials it is compared with

ProButyrate is a capsule of butyric acid, the short-chain fatty acid that gut bacteria make from fiber, sold by Tesseract Medical Research. Most butyrate supplements use a salt (sodium, calcium or magnesium) or tributyrin, a fat that carries butyrate; this one lists the free acid held in a dextrin fiber carrier. This page covers what the panel prints and leaves out, the trials of butyrate salts, the dose directions, the cost and the reviews.

What ProButyrate is, and what it is not

The Supplement Facts panel prints one row: Natural Butyric Acid Proprietary Complex, 300 mg per capsule, with no daily value. The serving size is one capsule; the “600mg” in the Amazon title means two capsules. The panel footnote describes the form as “solubility-enhanced natural Butyric Acid, pure, individual free fatty acid” in CyLoc, a dextrin fiber matrix, compounded with a release agent named DexKey. The other ingredients are a hypromellose capsule, hydroxypropyl methylcellulose for the sustained release, an unnamed plant-derived enzyme and calcium laurate.

What the panel does not say is how much of the 300 mg is butyric acid. For scale only, sodium butyrate is about 80% butyric acid by weight, so 300 mg of that salt holds roughly 240 mg of acid; ProButyrate is not a salt, and no assay is posted, so the arithmetic does not carry over. The brand’s listing says the product contains only butyric acid, not tributyrin, and argues that sodium and magnesium salts mean larger particles and more capsules; that is the brand’s comparison, not a measured one.

The bottle prints the brand’s domain, TessMed, whose store asks for a sign-in before it shows the ProButyrate page, so the brand’s own price, text and reviews could not be read. The brand sells through practitioner channels such as Fullscript and Emerson Ecologics, with Amazon as the open consumer route.

Why butyrate comes in so many forms

Butyrate is a fuel for the cells lining the colon, and gut bacteria produce it when they ferment fiber. Butyric acid is absorbed quickly in the upper gut and has a strong odor, which is why salts, coatings and fat-based forms such as tributyrin exist. BodyBio Butyrate Sodium and BodyBio Butyrate with Calcium and Magnesium are salts, and CoreBiome Tributyrin is the fat-carried form; the tributyrin in Vivvira Restore and Bio Complete 3 is covered in those guides. A 2026 review says outcomes may depend on delivery technology, release profile and dose.

The delivery claims, and what is posted

The listing says “Sustained release” and “Advanced Absorption” and that each butyric acid molecule is locked in a dextrin fiber carrier that delivers it to the large intestine. Those are the brand’s claims, and two of its statements disagree: a listing graphic says “Patented” while the panel footnote says “patent pending”.

We found no release profile, dissolution test or absorption study for this product, and PubMed searches for ProButyrate, CyLoc and DexKey each returned zero results. No laboratory is named, and we found no certificate of analysis, third-party seal or butyric acid assay; the listing says only that it is made to GMP standards.

The trial of the product itself

There is none. The evidence that exists is for butyrate salts, and the label cannot be set against it, because the trials state their doses in milligrams of the salt and the label states milligrams of a complex.

The evidence for butyrate salts

In 66 adults with IBS already on standard drug therapy, microencapsulated sodium butyrate or placebo was added for 12 weeks. Pain during defecation fell significantly by four weeks, and urgency and bowel habit improved by 12. Reductions in abdominal pain and flatulence were not significant, and neither was the fall in overall symptom severity (Banasiewicz et al., Colorectal Disease, 2013). The abstract gives no dose; a later paper describes it as 300 mg of sodium butyrate a day.

A 2026 trial in 52 adults with type 2 diabetes who met Rome IV criteria for IBS gave 1.5 g a day of microencapsulated sodium butyrate for 12 weeks. Abdominal pain, diarrhea and bloating fell in the butyrate group (Panufnik et al., Scientific Reports, 2026). The trial was registered retrospectively and enrolled people with diabetes.

A 120-adult IBS trial used a mixture: two capsules a day, each with 150 mg of sodium butyrate, five probiotic strains and 64 mg of prebiotic fiber. Adequate relief at four weeks was 64.7% against 42.0% on placebo, but the symptom severity and quality-of-life scores did not differ significantly (Gąsiorowska et al., Journal of Clinical Medicine, 2024). As a mixture, its effect cannot be assigned to the butyrate.

In 51 children aged 4 to 17 with IBS, 500 mg a day of a calcium butyrate formulation produced treatment success, a fall of at least half in the pain score, in 73% against 3.8% on placebo over eight weeks (Cristofori et al., Journal of Pediatric Gastroenterology and Nutrition, 2025). A pediatric trial in inflammatory bowel disease, a different condition, gave 150 mg of sodium butyrate twice a day for 12 weeks and found no difference in remission or disease activity (Pietrzak et al., Nutrients, 2022).

How to take ProButyrate

The bottle says to take 1 to 2 capsules two times daily or as recommended by a healthcare practitioner, so a day is 2 to 4 capsules, or 600 to 1,200 mg of the complex. Other sellers print other directions: Amazon’s comparison table for the 120-capsule bottle says 2 capsules twice daily, Natural Health Center prints 2 capsules twice daily, and Supp.co says 1 to 3 capsules twice daily. The bottle gives no instruction about food. No trial sets a dose or duration for this form; the salt trials ran 8 to 12 weeks.

Side effects and who should not take it

The bottle prints one caution: if pregnant, consult a healthcare practitioner before using it. The Natural Health Center page widens that to anyone who is nursing, trying to conceive, taking medication or living with a medical condition. No side-effect warning is printed, and the pediatric IBD trial reported no adverse events. Reviewers who object to the capsule itself mention its size, and two of six odor mentions on Amazon are negative.

What the reviews say

On Amazon, ProButyrate holds 4.5 from 757 ratings: 78% five-star, 10% four-star, 5% three-star, 1% two-star and 6% one-star. The listing shows a recent first-available date alongside that count, so the ratings probably carry over from an earlier listing; that is not confirmed. Natural Health Center shows 5.0 from two reviews; there is no Trustpilot profile, and the brand store’s reviews could not be read.

Amazon’s summary counts mentions: 52 for digestive effects (42 positive, 10 negative), 42 for quality (38 positive) and 14 for value for money (3 positive, 11 negative). The recurring praise is relief of IBS-type bloating and stomach upset, and an easy capsule with little smell compared with other butyrates. The recurring complaints are price, with one reviewer calling it “pricey”, and no noticeable effect.

Cost, subscription and refund terms

The brand’s own prices are behind its sign-in. Amazon lists Subscribe & Save at $36.00 with no fees and skip-or-cancel terms, and 5% off only with five or more subscribed products. Amazon marks it non-returnable unless damaged or defective. The brand’s shipping page says a refund requires contacting its support address and returning the product with a tracking number; no number of days is printed there, and its home page carries a money-back guarantee banner. The Amazon text we could read held no complaint about unexpected charges or refused refunds, a small sample.

Who ProButyrate is for

• Someone who wants butyrate as the free acid rather than a salt, and accepts that the acid per capsule is not printed.
• Someone who can take two to four capsules a day for the 8 to 12 weeks the salt trials ran.

For a label that can be set against the trial doses, BodyBio Butyrate Sodium is the same kind of salt the sodium butyrate trials used, though without those trials’ microencapsulation. For cramping and urgency with bowel changes, the IBS-D guide and the IBgard guide cover products with trials of their own, and the quiz matches a product to a symptom.

The products in this catalog

Common questions

Sources

• Banasiewicz T, Krokowicz Ł, Stojcev Z, et al. "Microencapsulated sodium butyrate reduces the frequency of abdominal pain in patients with irritable bowel syndrome." Colorectal Disease, 2013;15(2):204–209. PMID 22738315. pubmed.ncbi.nlm.nih.gov/22738315
• Panufnik P, Więcek M, Szwarc P, et al. "Effect of microencapsulated sodium butyrate on abdominal symptoms and carbohydrate metabolism in patients with type 2 diabetes: a randomized placebo-controlled trial." Scientific Reports, 2026;16(1). PMID 41974937. pubmed.ncbi.nlm.nih.gov/41974937
• Gąsiorowska A, Romanowski M, Walecka-Kapica E, et al. "Efficacy and Safety of a Mixture of Microencapsulated Sodium Butyrate, Probiotics, and Short Chain Fructooligosaccharides in Patients with Irritable Bowel Syndrome." Journal of Clinical Medicine, 2024;14(1). PMID 39797089. doi.org/10.3390/jcm14010006
• Cristofori F, Calabrese FM, Iacobellis I, et al. "Calcium butyrate efficacy in pediatric irritable bowel syndrome: Randomized placebo-controlled multiomics-based clinical trial." Journal of Pediatric Gastroenterology and Nutrition, 2025;81(3):551–561. PMID 40635319. doi.org/10.1002/jpn3.70154
• Pietrzak A, Banasiuk M, Szczepanik M, et al. "Sodium Butyrate Effectiveness in Children and Adolescents with Newly Diagnosed Inflammatory Bowel Diseases-Randomized Placebo-Controlled Multicenter Trial." Nutrients, 2022;14(16):3283. PMID 36014789. doi.org/10.3390/nu14163283
• Caban M, Pikus E, Czarnecka-Chrebelska K, et al. "Use of Sodium Butyrate and Its Microencapsulated Forms in Intestinal Diseases-Current Clinical Approach." Digestive Diseases and Sciences, 2026;71(5):1626–1639. PMID 41238998. doi.org/10.1007/s10620-025-09536-4
• Banasiewicz T, Domagalska D, Borycka-Kiciak K, et al. "Determination of butyric acid dosage based on clinical and experimental studies - a literature review." Przeglad Gastroenterologiczny, 2020;15(2):119–125. PMID 32550943. doi.org/10.5114/pg.2020.95556
• Tesseract ProButyrate: label, directions, price, ratings and review summary as listed on Amazon, and the retailer text and rating on the Natural Health Center product page. amazon.com, nhc.com
• Tesseract Medical Research: shipping and returns terms. tessmed.com/shipping-and-returns