In this book, the author covers issues related to hydrogen peroxide as a source of atomic oxygen necessary for the body. Hydrogen peroxide helps to normalize redox processes and destroy everything that prevents the body from functioning normally. The mechanism of action of hydrogen peroxide, as well as the proposed ultraviolet irradiation of blood as one of the effective ways to correct the immune system, is discussed in detail. Detailed recommendations and comments on already known methods of treatment with hydrogen peroxide are offered. Feedback from readers on its use, including in combination with ultraviolet irradiation of blood for various diseases, is given. The book is intended for a wide range of readers, including doctors and people interested in introducing simple and reliable methods of treatment into the practice of official medicine. 3rd revised edition.