Primobolan® is a steroid compound that is described chemically as 17β-Hydroxy-1-methy1-5α-androst-1-en-3-one heptanoate. Primobolan® is a sterile solution of Methenolone Enanthate, Ph.Jpn., Micronized grade in Migyyol 840, Ethyl oleate, Benzyl benzoate, Benzyl alcohol.