Peptides / Category
Sexual Health Peptide Testing
Melanocortin-pathway peptides are cyclic and require cyclization confirmation by mass loss (–2 Da disulfide closure). Counterfeits often ship the linear precursor.
Recommended Panel
- ✓RP-HPLC purity
- ✓LC-MS (cyclization confirmation)
- ✓Disulfide bond mapping
Common Impurities to Watch For
Linear (uncyclized) precursor, oxidized disulfide, racemization.
Sexual Health peptides we test (3)
Melanotan I (Afamelanotide)
1646.85 g/mol
Linear α-MSH analog (Scenesse); approved for erythropoietic protoporphyria.
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Melanotan II
1024.18 g/mol
Cyclic α-MSH analog; widely used as a tanning research peptide.
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PT-141 (Bremelanotide)
1025.18 g/mol
Melanocortin-receptor agonist derived from Melanotan II. FDA-approved as Vyleesi.
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