Disclosure: We earn a commission from vendors on this page. Rankings are based on price, COA availability, and reputation.
Best Immune Peptides (2026)
Immune peptides strengthen your body's defense systems — from T-cell activation to antimicrobial action. Here are the best vendors for each.
At a Glance
1Thymosin Alpha-13 vendorsGold standard immune peptide. FDA orphan drug for hepatitis B. Activates T-cells and dendritic cells. Well-tolerated even long-term.
Gold standard immune peptide. FDA orphan drug for hepatitis B. Activates T-cells and dendritic cells. Well-tolerated even long-term.
Gold standard immune peptide. FDA orphan drug for hepatitis B. Activates T-cells and dendritic cells. Well-tolerated even long-term.
| Vendor | Price | Amount | $/mg | COA | |
|---|---|---|---|---|---|
| EZ Peptides | $58.00 | 10mg | $5.80/mg | Yes | Buy → |
| Ascension Peptides | $75.00 | 10mg | $7.50/mg | Yes | Buy → |
| Ion Peptide | $42.00 | 5mg | $8.40/mg | Yes | Buy → |
2KPV3 vendorsPotent anti-inflammatory tripeptide derived from alpha-MSH. Strong gut and skin inflammation data. Very few side effects.
Potent anti-inflammatory tripeptide derived from alpha-MSH. Strong gut and skin inflammation data. Very few side effects.
Potent anti-inflammatory tripeptide derived from alpha-MSH. Strong gut and skin inflammation data. Very few side effects.
| Vendor | Price | Amount | $/mg | COA | |
|---|---|---|---|---|---|
| EZ Peptides | $38.00 | 10mg | $3.80/mg | Yes | Buy → |
| Ascension Peptides | $79.99 | 10mg | $8.00/mg | Yes | Buy → |
| Ion Peptide | $49.00 | 10mg | $4.90/mg | Yes | Buy → |
3LL-373 vendorsNatural antimicrobial peptide — kills bacteria, viruses, and fungi directly. Also modulates immune response.
Natural antimicrobial peptide — kills bacteria, viruses, and fungi directly. Also modulates immune response.
Natural antimicrobial peptide — kills bacteria, viruses, and fungi directly. Also modulates immune response.
| Vendor | Price | Amount | $/mg | COA | |
|---|---|---|---|---|---|
| Ion Peptide | $45.00 | 5mg | $9.00/mg | Yes | Buy → |
| BioLongevity Labs | $94.97 | 5mg | $18.99/mg | Yes | Buy → |
| Swiss Chems | $71.99 | 5mg | $14.40/mg | Yes | Buy → |
4Thymulin2 vendorsThymus hormone that matures T-cells. Age-related decline makes supplementation logical but limited modern research.
Thymus hormone that matures T-cells. Age-related decline makes supplementation logical but limited modern research.
5VIP3 vendorsVasoactive intestinal peptide — broad anti-inflammatory. Used in CIRS/mold illness protocols. Complex dosing.
Vasoactive intestinal peptide — broad anti-inflammatory. Used in CIRS/mold illness protocols. Complex dosing.
Vasoactive intestinal peptide — broad anti-inflammatory. Used in CIRS/mold illness protocols. Complex dosing.
| Vendor | Price | Amount | $/mg | COA | |
|---|---|---|---|---|---|
| Ion Peptide | $79.00 | 10mg | $7.90/mg | Yes | Buy → |
| BioLongevity Labs | $74.97 | 5mg | $14.99/mg | Yes | Buy → |
| Royal Peptides | $465.00 | 10mg | $46.50/mg | Yes | Buy → |
How We Rank Vendors
Every vendor is scored on three factors: price per mg (40%), third-party COA testing (30%), and community reputation (30%). Scores floor at 8.0 — if a vendor is on our site, they are worth buying from.
Normalized to $/mg for fair comparison across vial sizes.
Third-party lab results confirming purity and identity.
Community feedback, shipping reliability, and track record.