Melanotan II (MT-2) is a synthetic analog of the naturally occurring α-MSH (alpha-melanocyte-stimulating hormone) that acts on melanocortin receptors in the body. It is studied primarily for its ability to stimulate melanocytes and increase the production of melanin, the pigment responsible for skin color.
In experimental research, its influence on pigmentation and the skin's response to UV exposure is examined, as well as the effects of melanocortin system activation on appetite and sexual function. Melanotan II is not approved as a drug for skin tanning and is intended strictly for research use only.

