Best peptides for immune support
Peptides that modulate immune function, support immune defense, and help regulate inflammatory responses.
What to know
Thymosin Alpha-1 is the gold standard immune peptide — FDA-approved in 35+ countries for hepatitis B/C and as an immune adjunct. LL-37 is a natural antimicrobial peptide with broad-spectrum activity. These peptides modulate rather than simply boost immunity, which is an important distinction for autoimmune considerations. Immune peptide protocols are typically used short-term (2-4 weeks) or cyclically.
Recommended peptides
LL-37
LL-37 is a human antimicrobial peptide (cathelicidin) that plays a key role in innate immune defense against bacteria, viruses, and fungi.
BPC-157
BPC-157
BPC-157 (Body Protection Compound-157) is a synthetic peptide derived from a protein found in human gastric juice. It has shown remarkable healing properties in preclinical studies across tendons, ligaments, muscle, gut, and nervous system tissue.
Selank
Selank is a synthetic analog of the immunomodulatory peptide tuftsin with anxiolytic and nootropic properties, approved for clinical use in Russia.
Thymosin Beta-4
Thymosin Beta-4 is the full-length naturally occurring protein from which TB-500 is derived. It plays a central role in tissue repair, cell migration, and immune modulation.
Recommended stacks
Anti-Aging Longevity Stack
advanced — $300-600
Multi-pathway anti-aging protocol targeting telomeres, mitochondrial function, skin health, and immune modulation.
Gut Restoration Stack
beginner — $80-160
Targeted gut healing protocol for leaky gut, IBS, GERD, or post-antibiotic gut repair using oral and injectable peptides.
Immune Defense Stack
beginner — $100-200
Short-term immune system protocol for illness prevention, post-illness recovery, or pre-travel immune preparation.
Explore other goals
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Reviewed by Fat Man in the Arena · Updated March 2026