Winter is the perfect time to start Melanotan II This popular tanning peptide works by stimulating natural melanin production, helping support a deeper, longer lasting tan with less UV exposure. Benefits may That quick tan injection is NOT worth the risk., Melanotan peptide injections stimulate pigment cells, and its use has been linked to rapid changes in moles, including the potentially fatal skin MT 2 (Melanotan II) Polar Peptides Melanotan II (Tan Jabs): Why They're Not Worth The Risk Melanotan II A Sun Kissed Look, and a Confident You.