Selenium tablets can be taken daily in moderation, but should not be taken for a long time. In the process of selenium supplementation, results are usually seen in about 2 months. Selenium tablets are used to supplement selenium, an essential trace element for the human body. Selenium for the human body mainly has antioxidant, protection of cell membrane integrity, regulation of immune function and other effects. In clinical practice, selenium tablets are mainly used to assist in the treatment of a series of diseases caused by selenium deficiency, including immune function abnormalities, malignant tumors and so on. Selenium tablets can be taken daily in moderation, but should not be taken for a long time. During taking selenium tablets, it is best to check liver function regularly to avoid liver damage. Generally in the process of selenium supplementation, about 2 months will have a significant effect. Selenium tablets supplementation needs to be taken in moderation, not in large quantities, so as not to cause poisoning, may also lead to nausea, vomiting, hair loss and other adverse reactions, it is best to follow medical advice on the use of drugs.