Melanotan II: Tanning injections, nasal sprays harmful to health 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 Melanotan (MT) II Melanocortin Receptor Agonist MedChemExpress 95% (HPLC), MC3 R MC4 R melanocortin agonist, lyophilized solid Sigma Aldrich How Tanning Injections Work [Print Article] All Things Tanning For Tan Fans! Get a tan that lasts with melanotan tanning injections! Melanotan stimulates melanin production in the skin, the pigment responsible for giving us that coveted bronzed look. With regular injections, you can achieve