Melanin and hair color How natural hair colors are created and change over time Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically Melanotan II: Tanning injections, nasal sprays harmful to health Nasal tanners left me suffocating in hospital' BBC News Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and