Melanotan II
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Melanotan II is a synthetic cyclic lactam analog of the naturally occurring hormone α-MSH (melanocyte-stimulating hormone), originally developed at the University of Arizona. This licensed peptide is primarily known for its ability to darken the skin by increasing the production of melanin, the pigment responsible for skin color. In addition to its tanning effects, clinical trials have suggested that Melanotan II may also have aphrodisiac properties.
Research Background: Melanin and UV Exposure
Researchers at the University of Arizona proposed that natural skin pigmentation could serve as a protective mechanism against skin cancer. By increasing melanin levels before UV exposure, the body could potentially reduce the risk of damage from harmful rays. The naturally occurring α-MSH hormone stimulates melanin production, but it requires sunlight to activate. Directly using α-MSH as a treatment proved impractical due to its very short half-life, prompting scientists to search for a more stable synthetic alternative.
After testing hundreds of molecules, researchers developed Melanotan, a licensed peptide ([Nle4, D-Phe7]-α-MSH) that is roughly 1,000 times more potent than the natural hormone. Melanotan I and II were created to stimulate melanin production without the need for sun exposure.
Early Clinical Research at the University of Arizona
In 1996, the University of Arizona conducted a Phase 1 clinical trial with three healthy men to assess Melanotan II’s effects.
Subsequent studies published in 1998 and 2000 examined Melanotan II in men with psychogenic and organic erectile dysfunction.
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