Source comparison
Melanotan-2 Work: Peptide Comparison
Melanotan-2 is often compared to Melanotan-1 (afamelanotide), its linear analog, and to PT-141 (bremelanotide), a cyclic derivative. Each peptide differs in receptor selectivity, duration of action, and intended application. The table below clarifies how Melan
This comparison does not assign a generated winner or score.
- Melanotan-2 is often compared to Melanotan-1 (afamelanotide), its linear analog, and to PT-141 (bremelanotide), a cyclic derivative. Each peptide differs in receptor selectivity, duration of action, and intended application. The table below clarifies how Melanotan-2 work relative to these closely related compounds.
- Melanotan-2
- MC1R, MC4R (non-selective)
- ~33 min plasma; 24–48h receptor occupancy
- Tanning, appetite suppression, metabolic research
- Broad receptor activity. Tanning + appetite suppression + libido effects
- Best for multi-target melanocortin research; higher side effect profile due to MC4R activation
- Melanotan-1 (Afamelanotide)
- MC1R-selective
- ~40 min plasma; longer receptor binding
- Photoprotection, erythropoietic protoporphyria (EPP)
- MC1R-selective. Minimal appetite or libido effects
- FDA-approved for EPP; lower side effect burden but no metabolic effects
- PT-141 (Bremelanotide)
- MC4R-selective (some MC1R)
- ~2.7 hours
- Sexual dysfunction, libido enhancement
- Minimal pigmentation; primarily CNS effects via MC4R
- FDA-approved for hypoactive sexual desire disorder; not effective for tanning
- BPC-157
- Not melanocortin. Gastric pentadecapeptide
- ~4 hours (estimated)
- Tissue repair, GI healing
- Entirely different mechanism. No melanocortin activity
- Demonstrates that peptide structure dictates receptor selectivity entirely
- Melanotan-1 is MC1R-selective, meaning it produces tanning with minimal appetite suppression or libido enhancement. It's the compound approved by the FDA under the brand name Scenesse for treating erythropoietic protoporphyria (EPP), a condition where patients experience severe phototoxicity. Melanotan-1's selectivity makes it safer for long-term use in photoprotection protocols, but it lacks the metabolic and appetite-modulating effects that make Melanotan-2 work as a dual-purpose research tool. PT-141, conversely, is MC4R-selective and produces minimal pigmentation. It was developed specifically to isolate the libido-enhancing effects of melanocortin activation without tanning.