Selenium yeast tablets for drugs, its instructions for use of the drug does not specify the time to take this product, generally before and after meals can be. Selenium yeast tablets for selenium supplements, mainly used for low selenium cardiovascular, cerebral and cerebrovascular, liver disease, tumor disease patients or other low selenium-induced diseases, the time to take this product is not a clear and strict provisions, the patient can be based on the instructions for use of the drug or under the guidance of a physician to follow the instructions of the doctor to take. It should be noted that long-term overdose of this product can cause liver damage, nail deformation and hair loss and other adverse reactions. This product is used for people with low selenium nutritional status and is chewed and taken according to the instructions for dosage. It should be contraindicated for those who are allergic to this product.