Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically 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, Melanotan 2 results what results to expect Melanotan 1 (MT 1) UK Research Peptide Peptides Lab UK Melanotan Tanning Injections The Low Down Lynton Lasers Melanotan II Safety: Tanning Injection LIVV Natural