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 administered to Russian athletes at the Sochi Winter Olympics consisted of oxandrolone , a metenolone ester, and a trenbolone ester. 
If there is a only steroid cycle you would want to run but itself, than testosterone would definitely be it. This taking into consideration sex drive, estrogen levels and all the other changes that Testosterone-only cycle causes in our bodies and which are the mildest ones compare the many others stacks possible. While a longer test cycle may promote greater results, sticking with an 8-weeks Testosterone use is known to be the safest and most rewarding one in terms of muscle and strength improvements. However, some side effects can still appear so that make sure you follow the above-mentioned way of cycling, including PCT.