WADA warned of the dangers of buying illicit products on the internet. ‘Many companies operating illegally both in the United States, China, and elsewhere have no regard for product safety and mislabeling is common – both intentional and unintentional’, read a statement . ‘Products are often misrepresented, and their safety is not at all guaranteed. In addition, federal agents report that many of the underground steroid labs seized are extremely unsanitary, further illustrating the danger in buying these products illegally. For example, recent lab seizures uncovered huge amounts of raw materials being mixed in bathtubs and bathroom sinks.’
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.