Methenolone Acetate (Primobolan Acetate) is a dihydrotestosterone (DHT) based anabolic steroid. Primobolan Acetate is an ester derivative of Methenolone sold commonly under the brand names Primobolan (tablet form) or Primobolan Depot (injectable). When it interacts with the aromatase enzyme it does not form any estrogens. It is used by people who are very susceptible to estrogenic side effects, having lower estrogenic properties than nandrolone. Methenolone, in form of Enanthate and acetate, is available as an injection or as an oral formulation. The injection is regarded as having a higher bioavailability. It is an acetate ester which is quite short-acting. Because it by-passes hepatic breakdown on the first pass, it also has a higher survival rate. The tablets are in a short-lived acetate form. Methenolone is not 17-alpha-alkylated, but 1-methylated for oral bioavailability. This reduces the stress on the liver, but also the availability.