He works with Actovegin. Derived from calf's blood it, like insulin, effecting glucose and aiding aerobic oxidation in muscles. It is used to super charge the healing/repair processes. In December 2000 to into 2001,
there was talk of putting it on the banned list(Armstrong and team's use was a talking point), but IOC said more research was needed.
Everyone say he is a miracle doctor, with intuitive insight for every athlete's physiology, biomechanics and pathology. But, the treatment is always the same: Actovegin injection. He is a hammer, and every athlete's injury is a nail.
The most comprehensive article on M-W
may be here, translated from German. (The authors wrote a snippet in English, but write tehy are worried about a missed translation being susceptible to a lawsuit.)
In Germany, injections are okay, but WADA says IV's are banned/require a TUE. Banned by the US's Food and Drug Administration, and several other countries. Foreign athletes seem to have a one-and-done appointment, rather than a continuing relationship. In 2004 olympics, 16 declared its use, mostly in impact sports. He works closely with players from several teams in Germany.