Trenbolone cyclohexylmethylcarbonate, also known as trenbolone hexahydrobenzyl carbonate, is a synthetic anabolic-androgenic steroid (AAS) ester. It is a prodrug of the potent steroid trenbolone, where the active hormone is modified with a cyclohexylmethyl carbonate ester group at the 17β-hydroxyl position. This esterification significantly alters the pharmacokinetic profile, slowing the release of the active trenbolone into the bloodstream and prolonging its duration of action. Its primary and most significant application is in veterinary medicine, specifically as a growth promoter in livestock, such as cattle. It is used to improve feed efficiency, increase lean muscle mass, and enhance overall weight gain. In this context, it is strictly regulated and often administered via subcutaneous implants. Illicitly, it has been misused in human sports and bodybuilding for its potent anabolic effects, which include pronounced muscle growth and strength gains, though this use is banned by all major sporting bodies and carries significant health risks. The compound is not approved for human therapeutic use. Its use, particularly in food-producing animals, is subject to stringent regulations and withdrawal periods in many countries to prevent residues in meat. Common side effects associated with trenbolone and its esters are typical of AAS, including androgenic effects, potential hepatotoxicity, negative impact on cholesterol profiles, and suppression of endogenous testosterone production.