METHENOLONE ENANTHATE (PRIMOBOLAN) is a dihydrotestosterone derived anabolic steroid. Methenolone Enanthate 100 contains methenolone enanthate, a long-acting methenolone ester producing a rapid onset of serum methenolone with a continued duration of action of 5 to 7 days after IM injection. Methenolone Enanthate 100 is moderately anabolic with limited androgenic properties. Methenolone cannot aromatize to estrogen, reducing estrogenic side effects, and has a favorable safety profile among anabolic agents.