As is the case with most anabolic steroids, there is a strong risk to reward ratio at play. In many cases, the higher the dose the greater the reward will be; however, the higher the dose goes the higher probability of adverse effects occurring becomes. When planning your steroid cycles this is an important piece of the puzzle to keep in mind; after all, if you fall prey to numerous adverse effects you're not going to find your cycle all that valuable. It must also be stated; while there are standard doses of certain steroids that seem to be well-tolerated by most, as we are all unique individuals with our own genetic response some will be able to tolerate more while others may not be able to tolerate a specific steroid at all at any dose. In the end, regardless of where your total dose falls, understand that you are responsible for yourself and the actions you take.
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.