Zinc is a trace element, and its content and daily intake in the body are very small, but it plays a very important role in sexual development, sexual function and the generation of germ cells. The normal zinc content of human body is 2-3 grams, and most tissues contain trace zinc, especially liver, muscles and bones. Zinc is the main component of enzymes in the body and is also related to brain development and intelligence. Zinc can also promote the proliferation and activity of lymphocytes, maintain normal epithelial and mucosal tissues, prevent the invasion of bacteria and viruses, and promote wound healing.