Selenium supplementation does not lower blood sugar, so if you supplement selenium but don’t use hypoglycemic drugs to treat high blood sugar, your blood sugar will still rise. The need for selenium supplementation is usually seen in people who are deficient in selenium, and selenium deficiency may cause a series of symptoms such as cardiac arrhythmia, heart enlargement, tachycardia or bradycardia, and muscle atrophy, which can be alleviated by supplementation of selenium; however, selenium supplementation can not be used as a treatment for hyperglycemia. Patients suffering from hyperglycemia can be treated with dietary control, proper exercise, and if necessary, the use of hypoglycemic drugs, such as metformin, etc. All of the above methods can help lower blood sugar. Patients with elevated blood sugar should actively cooperate with their doctors for treatment.