Testoviron® is a steroid compound that is described chemically as 17β-Hydroxyandrost-4-en-3-one heptanoate. It is the principal hormone of the testis. The ester, Enanthate, is a stable, white or yellowish-white crystalline powder that is insoluble in water but very soluble in dehydrated alcohol, freely soluble in fatty oil and dichloromethane. Esterification of the 17 beta-hydroxy group produces compounds which have a longer duration of action. Testoviron® is a sterile solution of Testosterone Enanthate USP29, Ph.Eur.5.5 Micronized grade in Miglyol 840, Ethyl oleate, Benzyl benzoate, Benzyl alcohol.