Vitamins - especially B- and D-vitamins - influence the development and outcome of many neurodegenerative and other diseases. Among others, dementia, neural tube defects, epilepsy, and osteoporoses can be caused by vitamin deficiency. This book provides up-to-date knowledge on the role of water and fat soluble vitamins in the prevention of human diseases. Having knowledge about the association of vitamins and disease, as well as keeping track on the patients vitamin status has become increasingly important to every physician and clinical chemist.