Larazotide Guide
Tight Junction Peptide for Leaky Gut
Complete Larazotide (AT-1001) guide covering tight junction mechanism, leaky gut treatment, celiac disease protocol, MCAS gut permeability dosing.
AT-1001 Tight Junction Peptide for Leaky Gut, Celiac Disease & MCAS Gut Permeability
Larazotide acetate (AT-1001) is the first peptide drug designed specifically to close intestinal tight junctions and block the zonulin-mediated permeability cascade underlying leaky gut, celiac disease, and MCAS. It has completed multiple Phase 2 trials showing measurable reduction in gut permeability biomarkers and symptom scores in celiac patients on gluten-containing diets.
What Is Larazotide?
Larazotide acetate is an 8-amino acid synthetic peptide derived from the N-terminal region of Zonula occludens toxin (Zot), a protein from Vibrio cholerae that naturally opens tight junctions. Paradoxically, Larazotide uses a shorter Zot fragment to competitively block the zonulin receptor on intestinal epithelial cells — preventing the full-length zonulin from triggering tight junction disassembly. The result is closed, structurally intact tight junctions that maintain paracellular barrier integrity.
In celiac disease, gliadin fragments trigger zonulin release, which opens tight junctions and allows immunogenic peptides to cross the intestinal barrier — triggering the characteristic inflammatory cascade. In a landmark 2015 Phase 2 trial (published in Alimentary Pharmacology & Therapeutics), Larazotide 0.5 mg three times daily significantly reduced celiac symptom scores compared to placebo over 12 weeks in patients on a gluten-containing diet, with a favorable safety profile and minimal systemic absorption.
Beyond celiac, Larazotide is explored in MCAS (where gut permeability amplifies mast cell antigen exposure), type 1 diabetes (where pancreatic islet permeability may be zonulin-mediated), long COVID gut dysbiosis, and any inflammatory condition associated with elevated serum zonulin levels. It is orally active and acts locally in the gut lumen with minimal systemic exposure — a uniquely favorable safety profile for a therapeutic peptide.
Guide FAQs
Complete Larazotide (AT-1001) guide covering tight junction mechanism, leaky gut treatment, celiac disease protocol, MCAS gut permeability dosing.
Yes. Shotlee supports tracking Larazotide doses, side effects, and health metrics. It is free to use.
PubMed, ClinicalTrials.gov, and the FDA website are the most reliable sources for current Larazotide research and regulatory updates. Peer-reviewed journals including the New England Journal of Medicine, The Lancet, and JAMA publish the most impactful clinical trial results. This guide is updated regularly to reflect the latest available evidence. Use Shotlee to track your personal protocol outcomes alongside the published research.
Before starting Larazotide, establish baseline measurements including body weight, waist circumference, blood pressure, and relevant lab work with your healthcare provider. Download Shotlee and begin logging your baseline metrics at least one week before starting treatment. This pre-treatment data provides the comparison point needed to objectively evaluate your treatment response over time. Additionally, discuss potential side effects and management strategies with your prescriber so you are prepared for the initial adaptation phase.
Evidence-based lifestyle modifications that complement Larazotide protocols include: maintaining adequate protein intake (1.2-1.6g per kg body weight per day) to preserve lean mass, performing resistance training two to three times per week, staying well hydrated with at least eight glasses of water daily, prioritizing seven to nine hours of quality sleep, managing stress through regular physical activity or mindfulness practices, and eating smaller more frequent meals during dose titration phases. Track these lifestyle factors alongside your Larazotide data in Shotlee to identify which combinations drive your best results.
Track Your Larazotide Protocol in Shotlee
Free dose logging, side effect tracking, and health metric monitoring for your complete protocol.