Generally speaking, seafood, animal offal, lean meat and dairy products are high in selenium, while mushrooms, cereals, fruits and vegetables, nuts, eggs and their processed foods are also rich in selenium. Generally, as long as the diet structure is balanced, the intake of selenium is sufficient and no special supplementation is needed. If you want to supplement selenium through food, you can eat more sea fish, sea shrimp and other seafood, and you can also eat an egg every day, which can basically meet the daily requirements of selenium. In addition, you can also choose food with “selenium-rich food certification” logo. If you are suffering from diseases such as Keshan disease and selenium deficiency, the symptoms of selenium deficiency are more serious, and the effect of selenium supplementation through food intake is usually limited and takes a longer time, so the doctor will guide the use of selenium supplementation drugs according to the patient’s condition. It should be noted that although selenium has certain benefits to the body, it is only an ordinary trace element, and all kinds of diseases need to follow medical advice to actively treat. Excessive selenium supplementation can lead to hair loss, nail loss and other manifestations of selenium toxicity, so it is recommended to consult a doctor before supplementing selenium and use discretion according to your own situation, not to blindly supplement selenium.