Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia . 
Trenbolone Enanthate (Tren) users widely experience side effect though they can expect rapid gains in muscle size and strength. The steroid is often used in cutting cycles due to its ability to cause hardening of the muscles, and positively changing a person’s body composition. Trenbolone Enanthate is also said to be responsible for some level of fat loss, but we should not rely on the compound for this benefit. Due to its high androgenic characteristics, Trenbolone Enanthate is not really a suitable steroid to be taken by women. It is generally used by athletes and bodyguards. It can also improve feed efficiency and mineral absorption in animals. A sports person is advised to take Trenbolone Enanthate in the beginning of the sports season and gradually stack it with other anabolic steroids.