This book was created to be a user manual because it's not just technology that needs a guide; the human-machine also requires its instruction manual. By addressing a few conditions, one is able to prevent, cure, or at least improve most diseases. The question is: how to raise awareness among those who do not think about targeting the cause, but only the symptom? Creating guidelines for maintaining health and not just follow industry protocols for treating illnesses is the main goal of The Longevity Handbook. This book summarizes decades of research and offers new studies and findings to be applied for integral health: a new awareness about the functioning of the human-machine and how to get the most out of it, supply it with the best, achieve high performance, eliminate what hinders its operation, adjust all gears, and strengthen its system. With adjustments and prevention, this wonderful and perfect machine will have more longevity and, above all, quality of life while it is in operation. Unique formulas developed by the author based on vitamins, minerals, fibers, and probiotics available in foods and supplements are also presented in this book, along with their associated benefits, implications for immunity, and overall health. The purpose of this work is to serve as a source of information and research showing another view on the origin of diseases, which are often omitted or neglected in orthodox prevention and treatment. Examples are given on the benefits that can be achieved by stopping to use a single, common tool (drugs) and starting to treat the causes, using various sciences such as clinical nutrition, medical biochemistry, orthomolecular practice, phytotherapy, biophysics, homeopathy, homotoxicology, and traditional Chinese medicine.