Chambers admits to taking over 300 drugs

British sprinter Dwain Chambers admits in his autobiography that he took more than 300 different concoctions of performance-enhancing drugs.



Chambers, who is detailing his drug use in a book set to be released Monday, says it cost him $30, 000 a year for the banned substances.



He said he was not only on THF, EPO and HGH, but testosterone to help with sleep and reduce cholesterol.



Chambers further says he was also injecting insulin, three units into the lower part of his stomach after a heavy weightlifting session.



During that time, Chambers says he passed 10 doping tests and won the 100-meter gold medal at the 2002 European Championships. He also says he was often troubled by stomach cramps.



Chambers tested positive for THG in 2003 and was banned for two years.



Chambers returned to running and won a gold medal with Britain in the 4 by 100 relay at the 2006 European Championships. His 100 gold medals from the 2002 Europeans were stripped.



Chambers is due to compete for Britain this weekend at the European indoor championships in Turin, Italy, and plans to run at this summer\'s world championships in Berlin.