The role of selenium on brain infarction is mainly reflected in the scavenging ability of selenium on oxygen free radicals, the necrotic brain cells will release a large number of oxygen free radicals after brain infarction, which will damage the brain tissue, so supplementing selenium can increase the body’s scavenging ability of free radicals, which can reduce the damage of harmful free radicals on the brain tissue, and can also reduce some symptoms of brain infarction, and can also strengthen the collateral circulation. Selenium is a trace element, which can also enhance the immunity of the body and has a certain effect on the recovery of cerebral infarction. A large number of clinical studies have proved that selenium can also fight against cancer, as well as increase the function of heart blood vessels and have a certain effect on the regeneration of heart cells, so supplementing selenium has a very good effect on brain infarction, and it is also recommended that people check the content of selenium elements when necessary, and supplement selenium to enhance immunity and prevent the occurrence of diseases, etc.