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 . 
So the common side effects that many people associate with taking anabolic steroids include water retention and gynecomastia. Water retention is simply where the body holds too much water and can give the appearance as though the muscles are softer and bloating can also be caused. Gynecomastia is where the user’s breast gland becomes swollen and appears to be enlarged. So of course these side effects would be huge drawbacks for someone who is a bodybuilder because of the fact that it takes away from the kind of physique that they are trying to achieve. But users of tren do not have to worry about these side effects as they are caused by the levels of estrogen within the body being too high.