Emerging Threat: Melanotan, Repackaging, and Online Sales No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky Eruptive naevi and darkening of preexisting naevi 24 h after a single mono dose injection of melanotan II Semantic Scholar Melanotan II (Tan Jabs): Why They're Not Worth The Risk That quick tan injection is NOT worth the risk., Melanotan peptide injections stimulate pigment cells, and its use has been linked to rapid changes in moles, including the potentially fatal skin