Tren is a short name for trenbolone, which is a synthetic anabolic steroid used in veterinary medicine to promote muscle growth and enhance feed efficiency in livestock. Trenbolone is a man-made version of the hormone testosterone and is a powerful anabolic steroid that many bodybuilders and athletes use. Tren-based steroids like trenbolone acetate are often utilized by athletes to amplify muscle strength and mass gains. Tren helps stimulate substantial muscle growth and protein synthesis in the body by binding to androgen receptors. Trenbolone ester prodrugs, including trenbolone acetate and trenbolone hexahydrobenzylcarbonate, are or have been marketed for veterinary and clinical use. Trenbolone pills are also available for fitness enthusiasts who are primarily looking for performance and bulking effects. Trenbolone is illegal and only available through the black market, making it hard to check the quality and safety of the product. Trenbolone has several side effects, including increases in erythropoiesis (red blood cells), blood pressure levels, and low-density lipoprotein cholesterol, which can increase the risk of cardiovascular disease, myocardial infarction, and stroke.