Zinc is necessary for a healthy immune system, and is also of use in fighting skin problems such as acne, boils and sore throats. It is further needed for cell division, and is needed by the tissue of the hair, nails and skin to be in top form. Zinc is further used in the growth and maintenance of muscles. Children, for normal growth and sexual development also require zinc. It also seems as if zinc helps to control the oil glands, and is also required for the synthesis of protein and collagen - which is great for wound healing and a healthy skin.

There is a shortage of zinc in many people's diet, since zinc is destroyed in the milling process and is also lost in cooking. A deficiency will result in an under-performing immune system, open to infections, allergies, night blindness, loss of smell, falling hair, white spots under finger nails, skin problems, sleep disturbances etc. Men with zinc shortage may have a problem with fertility, while women may experience irregular periods. Children with too little zinc may have stunted growth and slow sexual maturity. With too little in the body, the sense of smell might suffer, as well as your sense of taste.

Elevated intake of zinc (1- 2 gram per day) over an extended period can actually harm your immune system instead of assisting it. Intake of zinc should be kept to under 100 mg per day as larger amounts may result in nausea, diarrhea, dizziness, drowsiness and hallucinations.

If you wish to take a zinc supplement, rather take it at night on an empty stomach, as zinc can interfere with the absorption of other minerals such as copper and iron. In a multi-vitamin situation, make sure that the zinc and iron is nearly in the same amounts. Large intakes of zinc can cause nausea and diarrhea.