Melanotan II is a synthetic analog of the melanocyte-stimulating hormone designed to enhance melanin production in the skin. The Melanotan II Lyophilized 10mg you may encounter comes in a powdered form, typically requiring reconstitution with a sterile diluent before use. https://biogeneticsusa.com/blog/all-you-need-to-know-about-melanotan-ii-lyophilized-10mg/