Civil selenium yeast tablets are selenium supplements. It can be used for preventing and treating diseases caused by selenium deficiency. It is suitable for patients with low selenium tumors, liver diseases, cardiovascular and cerebrovascular diseases or other diseases caused by low selenium. Selenium is an essential trace element for human body, and proper intake of selenium can improve the selenium level in the body. It can improve the activity of glutathione peroxidase (GSH-PX) in vivo. GSH-PX can protect the integrity of cell membrane, scavenge free radicals and enhance the immune function in vivo, so it has the function of preventing and treating diseases. The oral LD50 of this product is greater than 5g/kg body weight. It shows that this product has low toxicity and high safety. Patients with cardiovascular and cerebrovascular diseases, patients with liver diseases, diabetics, cancer patients, cancer patients with radiotherapy and chemotherapy, prostate patients, people with alcohol, tobacco and entertainment, people with irregular life, low immunity, people who often wear makeup, children with selenium deficiency, AIDS patients, fitness and beauty, daily health care, etc. all need appropriate selenium supplementation. Selenium can scavenge free radicals and resist oxidation, improve immunity, inhibit the repair of non-programmed DNA, inhibit the DNA synthesis of tumor cells, and the role of selenium in myocardial lesions. It plays an important role in preventing human cancer, cardiovascular disease, Keshan disease and Kaschin-Beck disease. Selenium yeast tablet is an organic selenium preparation with high bioavailability, low toxicity and definite curative effect. It has pharmacological effects such as protecting cell membrane integrity, scavenging free radicals, accelerating lipid peroxide decomposition, antioxidation, enhancing immune function and myocardial function.