Now look at the right side of the above diagram, the sources. To keep you alive, your body needs two things, plain energy to burn in the form of carbs or fat and then amino acids in the form of protein. Your body has an amazing series of emergency backup system to keep you alive should food be scarce. Your stomach is the gas tank for ordinary use. Your bodyfat is the backup up generator to be turned on when food is scarce. And your muscles are the emergency backup, your body wont turn on this nuclear power plant to cannibalize muscle unless its a DIRE emergency. Energy can come from any of the three systems but amino acids can only come from the stomach or the muscles.
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.
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