Melanotan II (MT2) is a synthetic analogue of the peptide hormone alpha-melanocyte-stimulating hormone (α-MSH). It primarily stimulates melanogenesis, which is the process of producing melanin in the skin, leading to tanning. This makes MT2 commonly used for skin tanning purposes.

Beyond tanning, Melanotan II has several other reported effects and uses:

• It can induce erections in men with erectile dysfunction (ED).

• It has been explored for potential benefits in conditions like rosacea and fibromyalgia.

• Some research suggests it may increase insulin sensitivity, influence certain behaviors, and enhance peripheral nerve regeneration.