The first English-language introduction to the developing science of endobiogeny. Dr Lapraz developed a diagnostic method that, while being rooted in modern science, allows an insight into the true causes of imbalance and disease in a patient. This innovative medical concept, based on a refined view of the neuro-endocrine system, integrates classical medicine with herbs and supplements, essential oils, and dietary and lifestyle modifications to create a truly holistic treatment approach to illness. The book sets out endobiogenic principles and methods, including the modelling system known as the Biology of Functions, and is full of remarkable case histories that attest to the efficacy of this approach. It is aimed both at the general public and at members of the health professions.