Erik Zabel, a Former T-Mobile cyclist and team mate of Jan Ullrich admits to using the banned blood booster EPO at the Tour d... Zabel, one of Germany's most successful cyclists, admitted to taking erythropoietin (EPO), which has been proven to boost endurance levels and apologised for lying about it. The admissions by Zabel and team mate Rolf Aldag come after two other ex Team Telekom riders -- Bert Dietz and Christian Henn -- said this week they were part of a systematic doping regime on the team that won the Tour de France in 1996 (Bjarne Riis)and 1997 (Jan Ullrich). Dietz told German television that Team Telekom carried out a systematic doping regime for its riders between 1994 and 1998.