Selenium Deficiency

Selenium is an essential trace mineral that is vital in maintaining human health. Selenium primarily exists as selenoproteins, which have diverse roles in the body's regular physiological processes and metabolism. In particular, glutathione peroxidase (G-Px), a selenoprotein, contributes to antioxidant defense, safeguarding the body against the damaging effects of reactive oxygen and nitrogen species. Another significant selenium-dependent function involves iodothyronine deiodinases, which facilitate the conversion of inactive thyroxine or tetraiodothyronine (T4) into the active thyroid hormone triiodothyronine (T3). Selenium's impact extends to the immune system, influencing its proper function and affecting the progression of HIV to AIDS. Research suggests that selenium deficiency is associated with an increased risk of various health conditions, including cardiovascular diseases, infertility, myodegenerative disorders, and cognitive decline. Current research is investigating the potential role of selenium in cancer treatment. Our understanding of selenium's significance in human health has evolved over the past 200 years since its discovery in 1817. Previously considered a carcinogen, selenium is now recognized as a crucial nutrient with a narrow therapeutic-to-toxic range.  Historically, selenium deficiency was associated with a type of cardiomyopathy known as Keshan disease, which was initially documented in China in the 1930s. The administration of selenium supplementation to individuals residing in areas where Keshan disease is endemic has demonstrated a significant reduction in the incidence of this condition, underscoring selenium's therapeutic potential.