Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
Its no secret, anabolic androgenic steroids are very commonly counterfeited and often the more popularity a particular steroid holds the more often counterfeit product will exist. Winstrol pills, while not the most commonly counterfeited are definitely up there on the list. It is very common for an individual to make a purchase and receive Dianabol rather than the Stanozolol hormone he ordered. This occurs due to Methandrostenolone (the hormone that makes Dianabol) powder being very cheap. Many labs will simply manufacture Dianabol, label it Winstrol and sell it to you and for the newbie especially, as he will get stronger with Dianabol he wont have a clue that hes bought a bogus product; after all, hes receiving gains, simply not the right ones. For this reason it is important to always have assurance in your source and never make such a purchase from a random individual.