Best Peptides for Gut Health: BPC-157, Larazotide & the Gut-Brain Axis

The gut is often called the "second brain" - it houses 70% of the immune system and produces 90% of the body's serotonin. Peptides that support gut health can have far-reaching effects on overall wellness.

Top Gut Health Peptides

[BPC-157](/blog/bpc-157-complete-guide) - The Gut Guardian

BPC-157 was originally isolated from human gastric juice, making it a natural gut-protective peptide:

• •Repairs gut lining (intestinal epithelium)
• •Protects against NSAID-induced stomach damage
• •Heals intestinal ulcers and fistulas in animal studies
• •Reduces intestinal inflammation
• •Can be taken orally for gut-specific effects

Larazotide Acetate

• •Specifically targets intestinal tight junctions
• •Reduces intestinal permeability ("leaky gut")
• •Studied for celiac disease management
• •Works by tightening the gaps between intestinal cells

KPV (Lysine-Proline-Valine)

• •Anti-inflammatory tripeptide
• •Reduces intestinal inflammation via NF-κB pathway
• •Studied for inflammatory bowel conditions
• •Can be administered orally or rectally for local effects

LL-37

• •Antimicrobial peptide that targets gut pathogens
• •Modulates gut immune response
• •Supports healthy gut microbiome balance

The Gut-Brain Axis Connection

BPC-157 is particularly interesting because it influences the gut-brain axis:

• •Modulates dopaminergic and serotonergic systems via gut signaling
• •May reduce anxiety and depression-like behaviors through gut repair
• •Protects against stress-induced gut damage

Oral vs. Injectable for Gut Peptides

For gut-specific effects, oral administration may be preferred:

• •BPC-157 oral: Direct contact with gut lining
• •BPC-157 injectable: Systemic effects that also benefit the gut
• •Some researchers use both routes simultaneously

Peptidrop's peptide database includes gut-specific protocols and the AI generator can create targeted gut health stacks based on specific gut concerns.

For research on peptides and gastrointestinal healing, see PubMed. Leading gastroenterology research is published in Gut.