Mo Farah Brought Joy and Late Closing Speed to Distance Running The New York Times Performance enhancing substance was procured from Switzerland for athlete Mo Farah SWI swissinfo.ch L Carnitine Micro Doping Why is it so Controversial? Nike Oregan, Alberto Salizar, Mo Farah Scandal Barry Fudge, physiologist and former UK Athletics head of endurance, says Mo Farah's victories were due to meticulous planning, hard work and determination as opposed to "some magical drug or illicit aid". Mo Farah admitted performance enhancing supplement use minutes after denying it, says leaked Salazar probe report