Immune System Peptides
Research peptides that modulate immune function, enhance T-cell activity, reduce inflammation, and support antimicrobial defense.
Immune System Peptides
This category covers peptides researched for their immunomodulatory properties, including direct immune cell activation, anti-inflammatory signaling, and antimicrobial activity. Several peptides in this category overlap with the healing and longevity categories due to the intimate connection between immune function, tissue repair, and aging.
Complete Peptide Directory
| Peptide | Description | Primary Mechanism |
|---|---|---|
| Thymosin Alpha-1 | 28-amino acid thymic peptide that enhances broad immune competence | Enhances T-cell maturation, dendritic cell function, NK cell activity |
| Zadaxin | Pharmaceutical-grade thymosin alpha-1 (thymalfasin) for clinical use | Same as thymosin alpha-1; approved in multiple countries for hepatitis and cancer adjunct |
| Imunofan | Synthetic hexapeptide immunomodulator from Russian pharmaceutical research | Modulates oxidative stress, immune cell function, and inflammatory signaling |
| Splenopentin | Pentapeptide derived from spleen extract with immune-enhancing activity | Enhances T-cell and B-cell proliferation; modulates cytokine production |
| Thymic Peptide Complex | Multi-peptide extract from thymus tissue for immune restoration | Broad T-cell activation and maturation; thymic microenvironment support |
| LL-37 | Human cathelicidin with direct antimicrobial and immune-signaling properties | Membrane disruption; LPS neutralization; immune cell chemotaxis |
| Defensin Beta | Human beta-defensin antimicrobial peptide family | Innate immune defense; antimicrobial membrane disruption; immune cell recruitment |
| Cathelicidin (CAMP) | Precursor protein of LL-37; broad-spectrum antimicrobial peptide | Antimicrobial defense; wound healing promotion; immune signaling |
| GV1001 | Telomerase-derived peptide vaccine with immunostimulatory properties | hTERT-derived; cancer immunotherapy; telomerase-targeted immune activation |
Common Research Themes
Innate vs. Adaptive Immunity: Thymosin Alpha-1 primarily enhances adaptive immunity (T-cells, dendritic cells), while LL-37, Defensin Beta, and Cathelicidin primarily modulate innate inflammatory pathways. This distinction matters for different research applications.
Immune-Aging Connection: Thymosin Alpha-1, Zadaxin, and Thymic Peptide Complex are studied specifically for reversing age-related immune decline (immunosenescence).
Antimicrobial Defense: LL-37, Defensin Beta, and Cathelicidin represent the host defense peptide arm of innate immunity, with direct pathogen-killing activity complementing their immune-modulatory functions.
Cancer Immunotherapy: GV1001 represents a distinct approach — using a telomerase-derived peptide to stimulate anti-tumor immune responses.
Getting Started
If you are new to this category, we recommend starting with Thymosin Alpha-1 — the best-characterized immunomodulatory peptide, approved in multiple countries for clinical use. From there, explore related peptides through the See Also sections on each page to build a comprehensive understanding of the research landscape.
Metabolic & Weight Loss Peptides
Research peptides that regulate metabolism, appetite, glucose homeostasis, and fat metabolism, including GLP-1 receptor agonists and lipolytic compounds.
Thymic & Immune Peptides
Research peptides derived from or acting on the thymus gland, modulating T-cell maturation, innate immunity, and age-related immune decline.