Melanotan II reverses memory impairment induced by a short term HF diet ScienceDirect Red Alert! MC1R Study Says: Redheads Can Tan, But They React Badly To It Reduced MC4R signaling alters nociceptive thresholds associated with red hair Science Advances Redhead Gene Doubles Melanoma Risk, Without Sun DNA Science No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky