Sonnen: I know for a fact that LeBron James takes EPO. We have one supplier

“If the world understood what LeBron did... If you knew how performance enhancers work, then you would understand that it matters. We had the same supplier, I know exactly what he does.

Erythropoietin works, so LeBron takes it. EPO increases the number of red blood cells, and this increases endurance and you can play the whole match,” Sonnen said on the Flagrant podcast.