Melanotan II: Melanocortin Receptor Research Beyond Pigmentation

Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH), engineered for greater potency and a longer research half-life than the native peptide. It binds non-selectively across multiple melanocortin receptor subtypes, which is exactly what makes it a useful — if complex — research tool.

Mechanism of Action

Melanotan II activates several melanocortin receptors (MC1R through MC5R) with varying affinity, producing effects well beyond skin pigmentation:

• ·MC1R — activation in melanocytes drives eumelanin synthesis, the mechanism behind its pigmentation research applications
• ·MC3R/MC4R — central nervous system receptors implicated in appetite regulation and energy homeostasis, an active area of obesity and metabolic research
• ·#c8d4e8] font-semibold">MC4R specifically — also linked in preclinical models to sexual arousal pathways, the basis for interest in compounds like [PT-141, which was developed as a more MC4R-selective derivative

Because Melanotan II is non-selective, it serves as a useful comparator when researchers want to isolate which melanocortin receptor subtype is responsible for a given downstream effect — contrasting its broad activity against more targeted compounds sharpens the mechanistic picture.

Research Applications

• ·Pigmentation and photoprotection research — the original and most studied application, examining UV-independent melanogenesis
• ·#c8d4e8] font-semibold">Appetite and energy balance studies — MC3R/MC4R activation's role in satiety signalling, relevant to broader [metabolic health research
• ·Sexual function research — central MC4R activation and its downstream effects on arousal pathways, a precursor line of research to PT-141's development
• ·Receptor selectivity and pharmacology studies — using Melanotan II's broad binding profile as a baseline against newer, selective melanocortin agonists

Comparing Melanotan II and PT-141

| Variable | Melanotan II | PT-141 |

|---|---|---|

| Receptor selectivity | Non-selective (MC1R–MC5R) | More MC4R-selective |

| Primary research focus | Pigmentation + broad melanocortin activity | Sexual arousal pathway research |

| Side-effect profile in research models | More pronounced due to broad receptor activity | Comparatively narrower |

Reconstitution and Storage

Melanotan II is supplied lyophilized and reconstituted with bacteriostatic water at standard peptide-research concentrations. Store reconstituted solution refrigerated at 2–8°C and protected from light, consistent with other melanocortin-class peptides.

Melanotan II is a precursor line of research to PT-141, which was developed as a more MC4R-selective derivative.

Shop Melanotan II or reference the Melanotan II dosage protocol.

Note: Melanotan II is sold by JA Performance strictly for laboratory and in vitro research use. Not for human consumption.