Zinc is an essential mineral which can be found in hundreds of enzymes in the body which, in their turn, affect many important functions in the body. Zinc helps the immune system to function normally and protects the cells against oxidative stress, and it also contributes to maintain a normal acidity-basicity balance and helps the DNA synthesis function normally. Zinc is also important because it contributes to a normal function and digestion of protein, fat, carbohydrates, and vitamin A. Some people take zinc supplements for their appearance since it helps keep skin, hair, and nails healthy. But zinc also contributes to other functions, like maintaining healthy eyesight, normal fertility and reproductive capability, and normal testosterone levels in the blood. And not everyone knows that zinc contributes to the skeletal structure.