Steroids are synthetic or man-made versions of testosterone, a male sex hormone which is made naturally by the body and used to build muscle mass and prevent muscle breakdown; increased facial hair growth and deepening of the voice and play an important role during male development puberty. You can take it either orally or injected into a muscle.
When anabolic steroids increase the levels of testosterone in the blood, they stimulate muscle tissue in the body to grow larger and stronger. However, the effects of too much testosterone circulating in the body can be harmful over time.
A doctor can legally prescribe them if your body doesn't make enough testosterone.