The active substance Trenbolone Enanthate is a synthetic anabolic androgenic steroid (AAS) , derived from nandrolone, used in veterinary medicine (usually as trenbolone acetate) to promote muscle growth and feed efficiency in livestock. In enanthate form, it prolongs the compound's effective half-life in the body. Although not approved for human clinical use, it is sometimes used illegally by athletes and bodybuilders due to its potent anabolic (increased protein synthesis and muscle mass) and androgenic effects .