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Larazotide

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Also seen as: Larazotide Acetate

The Dose Guy’s verdict
Aug 29, 2026
4 sources

Larazotide is the rare peptide on this shelf with hundreds of patients in real trials. It tightens the gut lining, and in celiacs still symptomatic on a gluten-free diet, the 0.5 mg dose cut symptomatic days by 26%. The catch is that the phase 3 program failed, the higher doses did nothing, and almost all the evidence is celiac-specific. A small pediatric MIS-C trial is the one exception. If you have celiac disease and a strict gluten-free diet is not enough, larazotide is a genuine lead. If you are chasing general gut healing, the data barely extends past celiac.

Would I take it?Caution. Real celiac data, but the program stalled.

What it is

Larazotide is a synthetic octapeptide that regulates the tight junctions between the cells lining your gut. When those junctions loosen, things that should stay inside the gut, like gliadin fragments from gluten, leak through and trigger immune flares. Larazotide tightens them back up. The mechanism is well established in cell and animal models: it rearranges the structural proteins, ZO-1, occludin, claudins, that form the seal between cells.

The clinical story is celiac disease, specifically people who maintain a strict gluten-free diet and still have symptoms, which is a larger group than you would think. Larazotide is not a general anti-inflammatory or a broad healing peptide. It does one thing, regulate the gut barrier, and the trial program tested it almost exclusively in one population. For broader healing work, BPC-157 and TB-500 cover more ground.

What the research shows

More human trial data than most peptides here, almost all celiac:

In adults with persistent celiac symptoms on a gluten-free diet, larazotide 0.5 mg three times daily improved the primary symptom endpoint and produced a 26% decrease in symptomatic days versus placebo. The 1 mg and 2 mg doses did not differ from placebo on any endpoint.Gastroenterology 2015 · phase 2 · n=342
During a 2.7 g daily gluten challenge for 6 weeks, larazotide 1 mg three times daily limited gluten-induced symptoms versus placebo, p=0.002.Aliment Pharmacol Ther 2013 · RCT · n=184
A meta-analysis of four RCTs found better symptom improvement with larazotide during gluten challenge, but no significant benefit over placebo among patients already following a gluten-free diet.Clin Res 2021 · meta-analysis · n=626
The one non-celiac trial: in 12 children with MIS-C, adjuvant larazotide produced faster gastrointestinal symptom resolution, spike-antigen clearance and return to usual activities. No larazotide-related adverse events through 24 weeks. Small, but the gut-barrier mechanism showed up outside celiac.Sci Transl Med 2025 · phase 2a · n=12

Realistic protocols

Oral, three times a day before meals, at the lowest dose. The trials made one thing clear: 0.5 mg works and higher does not. Larazotide has an inverted dose-response in the celiac data, where the higher doses showed no benefit at all, likely because the tight-junction regulation has a sweet spot and too much overshoots. So the protocol is simple and the dose is fixed.

Take it before meals because that is when gliadin exposure happens and when you want the gut barrier reinforced. It is an add-on to a gluten-free diet, not a replacement for one. The trials ran 12 weeks and showed consistent safety at that length.

Standard0.5 mg TIDThree times daily, before meals. Higher doses did not work in trials.
Duration12 weeksTrial length. Safety was placebo-comparable over this period.
Context+ GFDAdd-on to a gluten-free diet, not a substitute for it.

Side effects

Clean safety across the celiac trials, hundreds of patients deep:

commonHeadache and urinary tract infection were the most common adverse events in the 14-day gluten-challenge trial, at rates no different from placebo.
monitorIn the 342-person trial, overall safety was comparable with placebo over 12 weeks.
unknownNo long-term data beyond 12 weeks, and no safety data in non-celiac populations. The celiac gut is a specific context.

Where to buy

Disguised Research–
$99.99 / unit
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