I am adding comment because I want to not to enlighten, convince or entertain you. Don't need to justify anything to you actually, you are someone who has spent vast amounts of time convincing yourself that bread is bad for you and now you want me to waste my time convincing you why taking EPO responsibly is bad for you? How about taking cocaine responsibly? Emphasis on responsibly? Okay, if you insist or are too lazy: This from Wiki: The simple act of increasing the number of red blood cells in blood raises its viscosity, which can cause it to clot or coagulate more readily.[20] This increases the chances of heart attack, stroke, and pulmonary embolism, which has been seen in cases where there is too much blood reintroduced into the blood stream. Because blood doping increases the volume of red blood cells, it effectively introduces a condition called polycythemia, a blood disorder that has known adverse outcomes. This from sportsmedicine.about.com: Is Erythropoietin (EPO) Dangerous? Yes, EPO has its dangers. EPO injections thicken the blood, which increases the strain on the heart. This is particularly dangerous when the heart rate slows down, such as during sleep. The increased thickness, or viscosity, of the blood increases the risk of blood clots, heart attacks, and strokes. According to the book "The death of Marco Pantani" by Matt Rendell, some cyclists reportedly set an alarm each night to wake up and cycle on a trainer for ten minutes to jump-start their circulation and reduce the possible health risks of using EPO. This from medicalconsumers.org: This is the true story of an expensive anti-anemia drug that came on the market for one purpose; was heavily promoted for several unproven uses; and how the drive for profits led two drug companies to commit fraud. Kathleen Sharp, a veteran investigative reporter, describes what happened from the perspective of a drug salesman whose company pressured him into achieving higher and higher sales targets. The drug maker provided a playbook of tactics known to manipulate physicians into writing more prescriptions and at higher, more dangerous, doses. Eventually, the drug salesman-turned-whistleblower comes to the horrifying conclusion that over a half a million people have died as a result of this drug. Its benefits, if any, remain unclear; its safety never established. It is still on the market. Central to the story is one of the first biotech drugs to go on the market. Erythropoietin is the man-made version of human erythropoietin, which is produced naturally in the body and stimulates the bone marrow to make red blood cells. Epo, as it is called, became known as a “blood booster,” sold by Amgen and Johnson & Johnson under the brand names: Procrit, Epogen, Aranesp, and Eprex (Europe). Sorry, cop out or not, I am not going to read it all out loud for you. Use it, don't use it, half million deaths is more than heroin killed last year, even when used responsibly...