The synergistic combination of trimetazidine, hypoxen and L carnitine in endurance sports British Journal of Pharmacy The World Anti Doping Agency filed a brief in the Valieva case stating that the mention on the form of L carnitine and Hypoxen, though both legal, undercuts the argument that a banned substance, The World Anti Doping Agency filed a brief in the Valieva case stating that the mention on the form of L carnitine and Hypoxen, though both legal, undercuts the argument that a banned substance, L Carnitine Linus Pauling Institute Oregon State University Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo