The book considers the biological role. classification, methods of analysis and the impact of trace elements on the human body, taking into account the generalized data of domestic and foreign authors. The study of trace element status in various pathological conditions showed the presence of imbalances of trace elements. Timely inclusion in the therapy of various vitamin and mineral complexes normalizes the microelement status of patients and accelerates the recovery process. The book is intended for a wide range of specialists in various fields.