There is no authoritative information on what foods are high in selenium. Selenium is generally found in some amount in seafood, animal offal, grains, dairy products and other foods, such as oysters, pig liver, wheat and cheese. Selenium is a nutrient element, and there is no relevant authoritative information specifying what foods with high selenium content are available. However, according to other relevant information, seafood such as oysters, scallops, abalone and oysters contain a certain amount of selenium. Secondly, there are also animal offal such as pork liver, pork loin and chicken liver, as well as grains such as wheat, soybeans, corn and oats that contain selenium. In general, seafood and animal offal contain 0.4 to 1.5mg of selenium, grains contain 0.01 to 0.04mg of selenium, and dairy products contain 0.1 to 0.3mg of selenium. In addition, there are dairy products such as cheese and sliced milk that are rich in selenium. In your daily life, you need to mix and match your meals reasonably and balance your nutrition to ensure a balanced intake of various nutrients. Due to the limited ingredients in food, if you are deficient in selenium, you need to consider going to the hospital and taking medication to supplement selenium as prescribed by your doctor.