Melanotan II vs PT-141
Both are categorized under Melanocortin in our directory—here is how they differ in name, use, and label context.
Melanotan II
Melanocortin
A synthetic melanocortin peptide originally developed for tanning—now notorious for unregulated online sale.
Melanotan II activates melanocortin receptors, increasing skin pigmentation and (as a side effect) libido. It is not FDA-approved; injectable products sold online are unregulated with risks of nausea, mole changes, and u…
PT-141
Melanocortin
A melanocortin receptor agonist approved as Vyleesi for hypoactive sexual desire in women.
PT-141 (bremelanotide) works centrally on melanocortin-4 receptors—not by blood flow like PDE5 drugs. FDA-approved as a nasal spray (Vyleesi). Research-grade PT-141 sold online is not the same as the prescription produ…
Quick comparison
- Melanotan II: Melanocortin — A synthetic melanocortin peptide originally developed for tanning—now notorious for unregulated online sale.…
- PT-141: Melanocortin — A melanocortin receptor agonist approved as Vyleesi for hypoactive sexual desire in women.…