Dwain Chambers will provide one of the most compelling confessions in the history of sport today when he makes good on his vow to help to clean up the sport he tarnished. The British sprinter, who completed a two-year drugs ban in 2005, will provide UK Sport with a comprehensive cheats’ guide and admit to taking a cocktail of seven different drugs.

The information has been supplied by Victor Conte, the controversial brains behind the notorious Bay Area Laboratory Cooperative (Balco), which provided drugs for a string of high-profile athletes including Chambers. The scars from the Balco bust are still festering with the trial of Trevor Graham, the American sprint coach, due to start on Monday.

Conte told The Times that he is in close contact with Chambers and was happy to provide him with a three-page analysis of his old doping regime. “It’s the most detailed, specific, instructive information anyone in the world has ever seen,” Conte said. “It’s got the drugs, the doses, the frequencies and the purposes. Dwain does not have to do this but he is doing it because he has remorse in his heart.”

In the letter sent to The Times, Conte revealed that Chambers, who tested positive for the designer steroid tetrahydrogestrinone (THG) in 2003, actually took seven banned substances. The others were a testo-sterone/epitestosterone cream, EPO, insulin, human growth hormone, modafinil and liothyronine. Conte, who served a jail term for distributing steroids in 2005, previously limited himself to saying he gave Chambers “the full enchilada” of drugs.

Regarding THG, the substance Balco became infamous for, Conte said: “It was primarily used in the off-season and was taken two days per week. The purpose was to accelerate healing and tissue repair. Thirty units of the liquid was placed under the tongue during the morning.”

Chambers has polarised opinion since his second return to the Great Britain team at the World Indoor Championships in March. He won a silver medal in the 60 metres, but UK Athletics made it known that it had only picked him under the threat of legal action. Chambers has completed an unsuccessful trial at Castleford Tigers rugby league club and is considering appealing against his British Olympic Association (BOA) life ban.

Carl Myerscough, the British shot-putter, has already initiated a legal challenge to the BOA bylaw, but Conte revealed that Chambers wants to do the same. “I believe we’ll see him back at the Olympics,” he said. “I am in close contact with him and have continued to provide him with nutritional supplements and consultation. He does not have much money so he has to let someone else [Myerscough] take the lead.”

As well as details of drugs-taking, Conte’s letter explains what he calls the “duck and dodge”. He says athletes, who are only banned after missing three drugs tests, call their own mobile telephones so that the inbox becomes full and the testers cannot leave messages. Conte claims it should be a “one strike” rule because people take advantage by taking drugs until on their last life.

Chambers went to the United States in 2002 to find out why they provided so many top-class sprinters. According to Conte it was a dark epiphany and he started supplying Chambers with drugs under a detailed doping regime. Conte said that Chambers should be lauded for passing on his knowledge when he stood to gain nothing from it. “If they chose to judge him because of the detail then they are shallow people,” he said.