Many methods of blood doping are illegal, particularly in professional sport.

Accordingly, cobalamin is of little to no value in blood doping.

At the time, blood doping was not a banned practice.

Vinokourov also tested positive for blood doping after winning Monday's stage 15.

The first case came in the 2004 Olympics, when he was accused of blood doping by Olympic officials.

Somebody tell me why athletes won't go back to blood doping.

In the news conference later, Tarasov was questioned about blood doping.

At the time, blood doping was not considered a huge deal in road cycling and he mostly escaped punishment.

This preparation included blood doping, as Moser would later admit.

The Spanish police have implicated more than 100 riders in their investigation of blood doping.