EPO is a hormone which accelerates the production of red blood cells in the bone marrow. Red blood cells carry oxygen to working muscle. Make sure your friiend gets a ferritin test also. It is possible that a low RBC can result from high levels of oxidative stress in the muscle cells. Ferritin works also as an antioxidant and can be depleted in this scenario to serve a protective function. Anemia and a lower RBC could result in this scenario. Several nutritional factors also make RBCs more vulnerable to accelerated destruction. Email me (email@example.com
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EPO has been shown to raise the VO2max, though relatively few studies in elite athletes have really been done. It is important to know however that VO2max is not really a great predictor of performance. Raising the VO2 in and of itself is no assurance you'll be running any faster, especially if you are already at a high level of fitness. Aside fhe reported deaths in athletes using EPO, the hormone has also been show to accelerate the growth of tumors.