How Thymosin Beta 4 Supports Tissue Repair and Regeneration: Weight Loss and Vitality: Medical Weight Loss Love Island generation' skin cancer fear Alpha melanocyte stimulating hormone ( MSH): biology, clinical relevance and implication in melanoma Journal of Translational Medicine Springer Nature Link Tanning from the inside out = Highly Dangerous and Illegal!, Many products advertised on social media platforms promising a tan from the inside out or a tan without sun such as injectable Nasal tanners claim to work by using Melanotan II, a chemical that darkens skin pigmentation. It is illegal to sell medicinal products containing Melanotan II in the UK but since the tanners are sold No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky