Melanotan II

Overview

Melanotan II is a synthetic peptide that activates multiple melanocortin receptors (MC1R, MC3R, and MC4R) simultaneously, in contrast to more receptor-selective compounds like PT-141 (MC4R-selective) or Melanotan I (MC1R-selective).

Proposed Mechanism

Activates multiple melanocortin receptors (MC1R, MC3R, MC4R) non-selectively — which produces the pigmentation effect it's known for, but is also the documented source of its broader, less predictable secondary effect profile compared to receptor-selective analogs.

Research Context

The original research driver for Melanotan II was skin pigmentation (melanogenesis) via MC1R activation. Because it activates multiple receptor types rather than one, research and reported use has also touched on appetite and libido effects, which researchers attribute to its activity at the other melanocortin receptors it engages.

Evidence Status — Well-documented

Well-documented pharmacologically. Never received regulatory approval; non-selective receptor activation is a documented source of variable individual response in the literature.

The pharmacology of non-selective melanocortin receptor activation is well-documented, and this non-selectivity is itself a well-established, well-studied source of the broader and less predictable effect profile associated with Melanotan II compared to receptor-selective analogs. It has never received regulatory approval as a pharmaceutical product, unlike its more selective relatives PT-141 and afamelanotide.

Research Use Only

This page is a scientific reference summarizing publicly available research literature. It contains no dosing, administration, or protocol guidance, and nothing here constitutes medical advice. BactoCore does not sell this or any peptide referenced in this index — the only product sold directly is bacteriostatic water. See the Safety section for who should not handle research compounds, and the Research Use Disclaimer for full terms.