Precautions for taking selenium yeast tablets include: prohibited for those who are allergic to this product, use with caution for those with allergies; prohibited for use when the properties of this product have changed; keep this product out of the reach of children; if you are using other medicines, consult your physician or pharmacist before using this product. Selenium yeast tablets are light yellow or light yellowish brown tablets, with the special odor of yeast, sweet taste, should not have a strange odor. Selenium yeast tablets are commonly used to prevent and control diseases caused by selenium deficiency. Long-term use of selenium yeast tablets can cause liver damage and nail deformation, hair loss and other adverse reactions. Its contraindications are currently unclear. The drug needs to be used under the guidance of a doctor.