Seven Days Of Melanotan 2 Only about 4 hours of sun exposure this week. I feel as though my face has gotten the best results so far. Hoping the sun actually comes Melanotan (MT) II Melanocortin Receptor Agonist MedChemExpress 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 Melanotan II (Tan Jabs): Why They're Not Worth The Risk