Melatonin 101 Dosing, Timing, and What to Do When Melatonin Isn't Working I accidentally undid years of skin work and didnt realize it until it was too late., At the beginning of November, I started taking melanotan 2 and honestly?, I loved it., My tan deepened How Long Does It Take For Melanotan To Work? Top Melanotan II Benefits You Need to Know Victory Select Doctors warn against tan injections