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.
Many bodybuilders use steroids to increase their muscle mass and to build a perfect body shape, during a steroid cycle the muscles have a fast growth, but at the end of the cycle a part of the muscles goes away. This consequence can not be stopped, but there is a way to reduce them and try to preserve a great part of your muscle mass. First we will talk about some processes that happen in the body system during the steroids cycle, this is about: hormone levels, recovery process is faster after the training sessions, nutrients are being faster processed by the body.
GHB's unique attributes have some legitimate uses. In Europe, it is still used as an anesthetic, for alcohol and opiate addiction therapy, and for narcolepsy therapy. Only this last indication of narcolepsy is recognized by the US Food and Drug Administration, which recently approved GHB (ie, sodium oxybate [Xyrem]) to treat a small subset of patients with narcolepsy who have episodes of weak or paralyzed muscles (ie, cataplexy). Because of sodium oxybate's history of abuse as a recreational drug, the FDA approved it as a Schedule III Controlled Substance. A limited distribution program that includes physician education, patient education, a patient and physician registry, and detailed patient surveillance has been established. Under the program, prescribers and patients will be able to obtain the product only through a single centralized pharmacy.