Trenbolone enanthate is a potent, long-acting synthetic anabolic-androgenic steroid (AAS) derived from nandrolone, primarily used in bodybuilding for massive muscle growth and fat loss. As a C17β enanthate ester, it provides a slow release of trenbolone, but it was never formally marketed for human medical use. It carries significant risks, including cardiovascular issues, hypogonadism, progestogenic side effects.