Melanotan II causes hypothermia in mice by activation of mast cells and stimulation of histamine 1 receptors American Journal of Physiology Endocrinology and Metabolism American Physiological Society 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 Urgent warning issued over alarming TikTok beauty trends 7NEWS Figure 2 from Changes of melanocytic lesions inducedby Melanotan injections and sun bed use ina teenage patient with FAMMM syndrome Semantic Scholar Melanotan II: Tanning, Sexual Health Benefits, & Safety Concerns