if you are self-injecting medical-grade testosterone you need to do it the way your medical provider prescribed it. many forms are in oil or designed for slow absorption so intramuscular is usually the preferred method. if you do not want to inject it in the muscle as for a testosterone patch or cream but don't inject intramuscular testosterone intradermally (just under the skin).
what happens if i inject my testosterone just under the skin and not in the muscle? is it still effective?