For well-trained non-professional cyclists, the performance enhancing drug rHuEPO (recombinant human erythropoietin) appears to have a small effect on high intensity laboratory cycling tests, but the performance enhancing effects were mostly undetectable in a laboratory time trial test and an endurance road-race up Mont Ventoux (France), according to a new study.

Source: For amateur cyclists, EPO blood doping may have little effect on real-world road race performance – ScienceDaily