In 2013, during an appearance on the Oprah Winfrey Show, Lance Armstrong admitted to taking performance-enhancing drugs after denying the allegation for years. His admission came after the U.S. Anti-Doping Agency (USADA) had found that Armstrong had used banned substances—including erythropoietin (EPO) and human growth hormone— and that he had undergone blood transfusions and testosterone injections. When he declined to enter USADA’s arbitration process, Armstrong was stripped of his seven Tour de France titles. The following year, he admitted to using performance-enhancing drugs.