Peptides for tanning do exist. Melanotan 1 and Melanotan 2 both work at increasing melanin in the skin. Melanotan 1 takes longer to activate. Melnotan 1 is FDA approved. Melanotan 2 does libido, Who's tan is reay for summer. This peptide can help. Melanotan 1 (MT1) Therapy: Realistic Results and Expectations Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically There are two peptides people talk about for tanning: Melanotan 1 and Melanotan 2. Melanotan 1 works slower and mainly targets the skin, leading to a more gradual and even increase in Melanotan II Wikipedia