Dr. Rau has, since early in his career, developed a focus on natural therapies, especially homeopathy and nutritional changes. Success in the healing of his patients gave him inspiration to study with the leading practitioners of alternative healing methods. Amongst these were orthomolecular medicine, Chinese and Ayurvedic as well as European holistic medicine. Dr. Rau has developed his own holistic healing theory based on over 30 years of building knowledge and experience. This theory is Dr. Rau’s Biological Medicine. It is based on the principles of detoxification, nutrition, digestion and sustainable strengthening of the immune system.