Is a synthetic peptide that mimics the action of α-MSH, a hormone that stimulates melanin production. It promotes tanning without excessive sun exposure, reducing the risk of burns and skin damage.

In addition to enhancing pigmentation, Melanotan II may increase libido and improve erectile function due to its effects on the nervous system. However, it is not approved by most medical authorities and is mainly used for research purposes.

Possible side effects include nausea, darkening of moles, headaches, and increased blood pressure. Due to limited safety data, its use should be approached with caution.