The main component of yeast selenium is selenium, which is an essential trace element for human body. This drug is mainly used to treat some cardiovascular diseases, liver diseases or tumor-related diseases caused by selenium deficiency. Some studies have found that selenium has immunomodulatory, antioxidant and tumor-preventive effects, and some studies have found that yeast selenium, when taken orally with eugenol, has a unique effect on patients with hypothyroidism. There are also studies that yeast selenium can reduce the level of antibodies to Hashimoto’s thyroiditis, but in clinical applications it is found that it does not have a particularly significant effect in reducing antibody levels. Therefore, selenium is good for the body, but it is not suitable for everyone. It is recommended to check the elements to see if selenium is deficient, if not, no supplementation is needed.