Melanotan peptides, specifically Melanotan 1 (MT-1) and Melanotan 2 (MT-2) are synthetic analogs of the naturally occurring alpha-melanocyte-stimulating hormone (α-MSH). These peptides were initially developed for their potential to induce skin pigmentation and provide a tan without exposure to ultraviolet (UV) radiation. The primary purpose was to create a sunless tanning method, reducing the risks associated with traditional sun exposure.