Lysine and zinc are both nutrients that are important to the body, but they have different functions. Lysine is an essential amino acid, meaning it cannot be produced by the body and therefore must be obtained through diet. Lysine is important for growth, tissue repair and the production of enzymes, hormones and antibodies. It also plays a role in the absorption of calcium and the formation of collagen, a protein important for the health of the skin, bones and cartilage. Lysine is commonly found in foods such as meat, fish, dairy products, eggs, nuts and legumes. Zinc is a mineral that is also essential for the body. It plays a crucial role in many biological processes, including immune function, wound healing, DNA synthesis, cell growth, sense of taste and smell, and the maintenance of healthy skin, hair and nails. Zinc is found in foods such as meat, shellfish, nuts, seeds, dairy products and whole grains.