Selenium (symbol Se, atomic number 34) is a trace element that is an essential nutrient and an essential component of some of the most important antioxidants in the body, in particular the selenoproteins glutathione peroxidase, thioredoxin reductase, and selenoprotein P. Selenium is involved in the optimal functioning of the immune system.
Professor Alehagen has pointed out that there exists a special interrelationship between selenium and Coenzyme Q10 that can be exploited for clinical benefit in cases of heart disease. Adequate selenium must be available for the cells to achieve optimal concentrations of Coenzyme Q10, and, similarly, adequate levels of Coenzyme Q10 are necessary for the cells to achieve optimal function of selenium.