Trenbolone Acetate has a double bond at carbons 9 and 11, which significantly raises its binding affinity to the androgen receptor, slows down its rate of metabolism and inhibits it from aromatizing. The result of these characteristics is that it is considered one of the most powerful anabolic steroids around. In addition to its hormone structure, Trenbolone Acetate also has the benefit of having a relatively small ester attached to it. This ester is attached in order to regulate the release time of the hormone after its injection. This controlled release gives Trenbolone Acetate an extended half-life of two days. However, Trenbolone Acetate could have a range of forty eight to almost seventy two hours. This means Trenbolone Acetate is a fairly fast acting steroid, and it also means that injections should happen somewhat frequently so as to stabilize blood levels. While Trenbolone Acetate carries with it some of the common characteristics of other steroids, there is one single characteristic that lifts it far above the pack, making it superior in terms of potency and power. Trenbolone Acetate enhances protein synthesis, which is essentially the building block of muscle growth.
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 .  The infamous "duchess" cocktail allegedly administered to Russian athletes at the Sochi Winter Olympics consisted of oxandrolone , a metenolone ester, and a trenbolone ester.