Selenium Selenium Tablets is a health supplement that works to supplement the body with selenium, among other things. Lack of selenium will affect the normal physiological and metabolic functions of the body, which may lead to sensitized viruses invading the body and producing endemic selenium deficiency diseases. Low levels of selenium in the human body may increase the prevalence of cardiovascular disease and may also increase the incidence of thyroid disease. It is important to note that excessive use of selenium tablets may trigger selenium toxicity. Adverse reactions to selenium tablets are gastrointestinal symptoms, such as vomiting, diarrhea, and other symptoms, which in severe cases can trigger shock, as well as respiratory failure. Selenium tablets as a health product, not a substitute for medication for treatment, if you are not feeling well, please go to a regular hospital to consult a doctor.