Zinc is one of the most essential trace elements in the human body. Zinc deficiency can lead to a decrease in testosterone synthesis, amino acid metabolism disorders, protein synthesis disorders, making sperm density decrease, sperm formation stagnation, and affecting sperm activity. Generally, animal foods contain more zinc than plant foods. The food with the highest zinc content is oysters, other foods such as shellfish, shrimp, sea fish, beef and other lean red meat, animal liver, dairy products, nori, kelp, peanuts, mixed legumes, cereal germ and bran, cocoa, lotus seeds, sesame seeds, nuts, celery, tomatoes, potatoes, brown sugar and so on all contain a certain amount of zinc. Fruits have the highest content of apples. Chinese herbs such as Chinese wolfberry, ripe earth, mulberry, ginseng and eucommia also contain high amounts of zinc. Men would do well to eat some seafood. Generally speaking, three or four oysters can provide a normal man with the zinc he needs throughout the day.