In addition to increasing the nutrient efficiency, trenbolone can as no other drug stimulate the following most typical activities of anabolic steroids: acceleration of protein synthesis and maintenance of positive nitrogen balance. Protein synthesis determines how rapidly the body will build muscles, at that, the higher the nitrogen balance is, the more proteins will be built. Our muscle tissue consist of about 16% nitrogen, and, despite the fact that this value seems to be low, if the percentage falls below the optimum line, catabolic processes will win the battle in the body.
Trenbolone does carry with it progesterone-related side effects as well. Trenbolone can also increase Prolactin levels drastically in the body. These side-effects are sometimes mistaken with estrogen related side-effects . puffy nipples, gynecomastia , bloating, water retention etc. Anti-estrogens and aromatase inhibitors are known for counteracting such negative side effects. For Prolactin related issues, the use of vitamin B6 has been demonstrated to curb such side-effects in studies using as much as 600mg daily. Anti-prolactin drugs such as Cabergoline and Bromocriptine can also be very effective at reducing unnaturally elevated Prolactin levels.
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 .