Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Does the MOTC (Melanotan II) peptide injection accumulate or stop being effective once stopped? Melanotan 2 Small Peptide Vial Labels Matte Silver Finish Melanotan is BACK! After recent regulatory changes, compounding pharmacies are once again able to produce Melanotan peptide! If you've been missing the benefits of this popular peptide, now's your chance