In an era when the modern lifestyle, full of demands and exposed to a diet often inadequate and poor in nutrients, has created a gap in the coverage of essential vitamins, this book aspires to become the ultimate guide to understanding their critical importance and their proper supplementary intake. It systematically explores each category of vitamins, from water-soluble to fat-soluble, analyzing in depth their unique health benefits, the potential risks of their deficiency, as well as the possible side effects or interactions from excessive or incorrect intake. With clarity and scientific documentation, it presents the most recent bibliographic references, offering the reader a comprehensive picture of each vitamin individually, but also of how they interact with each other to achieve optimal health. The goal is to empower modern people to make informed decisions about their health, transforming vitamins from a simple supplement into a powerful ally for well-being and vitality.