| Compound | Class | Categories | Status |
|---|---|---|---|
| KPV Lys-Pro-Val; alpha-MSH (11-13) | Peptide fragment | Immune research · Tissue research | Identity established |
| LL-37 Human cathelicidin peptide | Cathelicidin peptide | Immune research | Identity established |
| TB-500 Thymosin beta-4 | Endogenous thymic peptide | Immune research · Tissue research | Fragment or analogue |
| Thymosin Alpha-1 Thymalfasin | Thymic peptide | Immune research | Identity established |
| VIP Vasoactive intestinal peptide | Neuropeptide | Immune research · Neurological research | Sequence reported, registry incomplete |