Can You Use Melanotan Long Term? Been testing out MT 1 peptide (Melanotan I) lately and honestly this stuff works. Originally developed for skin protection and UV resistance, but most people know it now for boosting melanin and giving Melanotan II Safety: Tanning Injection LIVV Natural 5 days progress. I've been taking 250mcg of Melanotan II and tanning for 10m outside daily. It's working Tighter in the hamstrings, glutes are still holding all of my fat so Melanotan II: Tanning injections, nasal sprays harmful to health