Many of the German doctor's treatments are controversial, including using injections of a substance called Hyalart, extracted from the crest of cockerels, which is claimed to help lubricate knee injuries and take away the pain. He has also injected honey or Actovegin into patients.
He has treated many footballers including Jürgen Klinsmann, Ronaldo and Jonathan Woodgate and other sportsmen and women such as Paula Radcliffe  Kelly Holmes, Maurice Greene  and Usain Bolt.
He helped cure Michael Owen's hamstring problems in time to play at the Euro 2000 tournament and has also helped Owen's Liverpool F.C. and England colleague, Steven Gerrard  and Harry Kewell. Darren Gough  and Alex Tudor, Essex cricketers, have benefited from the German doctor's pioneering treatments. On 6 May 2009 it was announced that he was helping Akpo Sodje recover from a longstanding hamstring problem
José María Olazábal, the 1994 US Masters golf champion was suffering from the crippling effects of rheumatoid arthritis when he visited Müller-Wohlfahrt but was able to win at Augusta again in 1999.
Rugby World Cup winner Will Greenwood  is another who has benefited from the doctor's treatment after 8 months with a groin problem. Weeks later he was staking a claim to a recall to the England team.
Even international sportsmen as far away as Australia have sought treatment from Müller-Wohlfahrt - Australian rules footballers Max Rooke and Mark Coughlan were treated for chronic hamstring injuries. Likewise he has also treated professional cyclists including Stephen Roche.
- Mensch, beweg dich!, Zabert Sandmann, ISBN 978-3-423-34093-9
- So schützen Sie Ihre Gesundheit, Zabert Sandmann, ISBN 3-932023-52-8
- So gewinnen Sie mehr Lebenskraft, Zabert Sandmann, ISBN 3-89883-037-3
- Verletzt, was tun?, with Hans-Jürgen Montag, ISBN 3-9806973-1-2
- Besser trainieren!, Zabert Sandmann, ISBN 978-3-89883-170-3
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