Trenbolone (also known under the brand names Parabolan, Tren, Finaject, Finaplex) is a powerful anabolic steroid used in the past in veterinary medicine to increase muscle mass and appetite in livestock. To increase the duration of action, Trenbolone is not used in its original form, as a rule, esterified derivatives are used: trenbolone acetate (with the shortest duration of action), trenbolone enanthate and trenbolone cyclohexylmethyl carbonate and hexahydrobenzyl carbonate. After injection into the muscle, trenbolone esters are gradually decomposed by plasma lipase, providing a long-term intake of the active substance into the blood. It has a powerful anabolic effect, but has many side effects, so it is not the best choice.