Melanotan II: Tanning injections, nasal sprays harmful to health Reduced MC4R signaling alters nociceptive thresholds associated with red hair Science Advances No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky Melanotan II: Tanning injections, nasal sprays harmful to health K T I TIE O IG EK "" With just a little UV exposure, the release of a Melanocyte Stimulating Hormone stimulates a natural increase in the production Melanotan 2 Injectable Peptide