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. 
250 mgs. / 1 cc. vials or preloads. Sustanon 250 is one of the most popular steroids and for good reason. It is precisely set up to give you results for up to a month after injection because each of the testosterones that make up Sustanon 250 stay active in the body for differing time periods. It gives you almost instant results that you can feel since it will hit you about 3 hours after your first injection. The reason for this is the fast acting properties of the testosterone propionate that is in it. The testosterone phenylpropionate and testosterone isocaproate will typically stay active for about 2-3 weeks each and the testosterone decanoate stays active in the body for up to a month. This combination is what gives Sustanon 250 its quick onset which continues to hit you for about 4 weeks after the last injection. This drug also degrades and tapers nicely for the same reasons. Some people will argue that Sustanon is good because since it is made up of multiple types of testosterone, that it "will hit multiple androgen receptors." This could not be further from the truth. You only have one type of androgen receptor. All steroids hit the same androgen receptor regardless of what you are taking.