 In an interview with Oprah Winfrey that aired January 17 and 18, 2013, on the Oprah Winfrey Network, Armstrong confessed that he has used banned performance-enhancing drugs throughout much of his cycling career, most recently in 2005.He admitted that he used erythropoietin, diuretics and human growth hormone, and that he had blood doped as well as falsifying documents saying he passed drug tests.Doping helped him for each of his seven Tour de France wins, Armstrong told Winfrey.