The Encyclopedia of Peptides

A to Z / Repair & recovery

Larazotide

Also known as AT-1001, larazotide acetate.

Best known for The "leaky gut" peptide that reached phase 3
Evidence★★★☆☆
Safety dataModerately characterised
Route Oral
United StatesInvestigational
AustraliaNot listed by name; unapproved therapeutic good
as at 16 September 2026

What it is

Larazotide is an eight-amino-acid peptide developed as a treatment for coeliac disease. It works locally in the gut and is not meaningfully absorbed: unusual and advantageous for an oral peptide.

Larazotide reached phase 3, further than almost any peptide in this section. It is not approved, and development was discontinued after that trial. It is the most clinically advanced compound associated with the “leaky gut” concept.

What the full entry covers

The book carries the rest of this entry:

Related entries

A certificate of analysis tells you what is in a vial. The evidence rating above tells you whether the compound has been shown to work in humans. Neither answers the other's question. How to read a certificate of analysis.

This page describes what is known and not known about Larazotide. It is not medical advice and not a recommendation to use it.