Source comparison
10. PT-141 vs Melanotan-II
PT-141 is chemically derived from Melanotan-II (MT-II) — both share the cyclic heptapeptide backbone — but with key differences: Selectivity: PT-141 has higher MC4R/MC3R selectivity with reduced MC1R activity; MT-II has higher MC1R activity (hence MT-II’s tann
This comparison does not assign a generated winner or score.
- PT-141 is chemically derived from Melanotan-II (MT-II) — both share the cyclic heptapeptide backbone — but with key differences:
- Selectivity: PT-141 has higher MC4R/MC3R selectivity with reduced MC1R activity; MT-II has higher MC1R activity (hence MT-II’s tanning effect)
- Carboxyl terminus: PT-141 has a free C-terminal carboxyl; MT-II has a C-terminal amide
- Tanning effect: significantly reduced in PT-141 compared to MT-II, owing to reduced MC1R activity
- Clinical approval: PT-141 approved as Vyleesi (2019); MT-II never approved
- Research use: PT-141 preferred for sexual-function and MC4R research; MT-II retained for MC1R / pigmentation research
- For UK laboratory research, PT-141 is the appropriate molecule for MC4R-focused studies; MT-II is the appropriate choice for MC1R-focused pigmentation biology work.