Dromastolone di-propionate is a synthetic derivative of dihydrotestosterone, producing an anabolic effect by promoting protein synthesis, as well as creating a positive nitrogen balance in humans. Since it is a derivative of dihydrotestosterone, dromastolone does not aromatize in any dosage and thus it cannot be converted into estrogen. Therefore, estrogen-related water retention is eliminated. Mastabol 200 Depot combines the fast-acting propionate form with the longer acting enanthate form.