PDF) Effects of a Superpotent Melanotropic Peptide in Combination With Solar UV Radiation on Tanning of the Skin in Human Volunteers Melanotan 1 and Melanotan 2 are peptides that boost melanin to darken your skin without the sun. Melanotan 1 is FDA approved for rare light sensitivity conditions and gives a more gradual and even tan Melanotan 1 (MT1) for Research: High Purity Peptides VivePeptides Melanotan 1 Ultra Labs Melanotan 1 vs Melanotan 2 : Key Differences