CHEMISTRY The chemical name of primobolan is Methenolone, and the pharmaceutical pame of primobolan is 1-methyl-1-testosterone. Thus, primobolan is chemically Methenolone Enanthate, Or Methenolone Enanthate. It is a dihydrotestosterone (DHT). Its chemical structure is 17 beta-hydroxy-1-methyl-5 alpha-androst-1-en-3-one. It does not aromatise to estrogen; primobolan does not form any estrogens when it interacts with the aromatase enzyme. The active life of Primobolan Depot (injectable) is 10-14 days, and of Primobolan (tablets) is 4-6hrs. Its detection time is 4-5 weeks.