Melanotan 2: The UV-Free Tanning Peptide
Melanotan II (MT-II, MT-2) is a synthetic cyclic heptapeptide analog of alpha-melanocyte-stimulating hormone (α-MSH). It acts as a potent non-selective agonist at melanocortin receptors MC1R through MC5R, with its primary research interest centered on rapid melanogenesis — the biological process of melanin production that causes skin tanning.
Mechanism of Action
Melanotan II's peptide sequence (Ac-Nle-c[Asp-His-D-Phe-Arg-Trp-Lys]-NH₂) incorporates a cyclic structure and D-amino acid substitution that provide enhanced receptor binding affinity and enzymatic stability compared to native α-MSH. Upon MC1R activation in melanocytes, MT-II triggers cAMP/PKA signaling cascades that upregulate melanogenic enzymes (tyrosinase, TRP-1, TRP-2), leading to increased melanin synthesis and skin pigmentation without UV exposure.
The ~33-hour half-life allows for flexible administration schedules. Beyond pigmentation, MT-II's activity at MC3R, MC4R, and MC5R subtypes also involves appetite modulation and libido pathway signaling in research models.
Role in the Ascension Stack
Within the Clavicular Ascension Stack, Melanotan II provides the melanocortin pigmentation pathway — enabling rapid tanning with minimal UV exposure. This pairs with GHK-Cu for comprehensive skin appearance research (pigmentation + collagen/firmness) and with the metabolic compounds (retatrutide) for body composition research where a lean, tanned appearance is the combined endpoint.
Clavicular Ascension Stack — 12 Compounds
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