Blood Doping
Blood doping is the altering of the number of RBC's (red blood cells) to increase the flow of oxygen by a series of techniques. Mostly used by athletes. The most common way is taking out about two pints of the athlete’s blood a few weeks before the competition they are competing in. The blood is frozen until a couple days before it is needed, thawed out, and then injected back into the athlete. This method is known as autologous doping (transfusion of blood from same person). Another type of doping is called homologous which is the transfusion of blood from a different person. And last EPO (Erythropoletin) injections.
There are many cons to using blood doping. One is that your body may reject the blood of someone