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 | $85.00 | 10mg | $8.50/mg | Yes | Buy → |
| Limitless Biotech | $67.99 | 10mg | $6.80/mg | Yes | Buy → |
| Ascension Peptides | $70.00 | 10mg | $7.00/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 | $45.00 | 10mg | $4.50/mg | Yes | Buy → |
| Ascension Peptides | $50.00 | 10mg | $5.00/mg | Yes | Buy → |
| Limitless Biotech | $48.99 | 5mg | $9.80/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 | |
|---|---|---|---|---|---|
| Limitless Biotech | $67.50 | 5mg | $13.50/mg | Yes | Buy → |
| Limitless Biotech | $67.50 | 5mg | $13.50/mg | Yes | Buy → |
| Limitless Biotech | $67.50 | 5mg | $13.50/mg | Yes | Buy → |
4Thymus 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.
Thymus hormone that matures T-cells. Age-related decline makes supplementation logical but limited modern research.
No vendors currently in stock.
5VIP1 vendorVasoactive 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 | |
|---|---|---|---|---|---|
| Limitless Biotech | $64.99 | 5mg | $13.00/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.