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.
The administration of PEDs runs counter to the dominant ethos of the medical science profession. The following is a direct quote from the Hippocratic Oath: “I will neither give a deadly drug to anybody who asked for it, nor will I make a suggestion to this effect.” Among the harmful side effects attributed to the use and the abuse of anabolic steroids include liver disease (including cancer and cystic hemorrhaging), anemia, renal dysfunction, impotence, pituitary gland dysfunction (including hypertrophy), and dysfunction of both the male and female reproduction system 4 . The off-label use of hGH in normal adults has some equally undesirable side effects, such as acromegaly (which is associated with cardiac disease), diabetes, osteoarthritis, and liver cancer. Additionally, there have been documented cases of athletes using hGH illegally produced from cadavers, risking the frightening transmission of Creutszfeld-Jakob syndrome, a uniformly fatal neurodegenerative disease for which there is no treatment 5 .