*Vitamin A is one of the trace elements necessary for the human body. Vitamin A can promote the synthesis of immune proteins, maintain the normal metabolism of epithelial cells, and promote the synthesis of immunoglobulins. This function is mainly because it participates in the synthesis of glycoproteins. In maintaining or regulating normal immune functions, it will Plays a very crucial role. Vitamin A is an essential nutrient for the human body. Vitamin A can keep the surface of tissues or organs healthy, and eating more can restore rough skin to normal.