Reversing Gray Hair: Inspiring the Development of New Therapies Through Research on Hair Pigmentation and Repigmentation Progress Hypopigmented burn hypertrophic scar contains melanocytes that can be signaled to re pigment by synthetic alpha melanocyte stimulating hormone in vitro PLOS One Melanotan II reverses memory impairment induced by a short term HF diet ScienceDirect No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky