Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn 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 pigment with Melanotan What It Is and Its Relation to Skin Cancer Before and after Melanotan tanning therapy, sunless tanning results Melanotan 1 10MG Simple Peptide Melanotan 1 Ultra Labs