Zinc is a constituent of many enzymes. It is essential for the proper function of these various enzymes. It is necessary for the metabolism and structural stability of nucleic acids. The zinc content of the adult human body ranges from 1.4 to 2.5 grams, with the highest concentrations in the bone, liver, kidney, pancreas and muscle tissue. It is a constituent of the enzyme carbonic anhydrase. This enzyme is, in turn, a constituent of red blood cells and gastric juices, and plays an important role in the deposition of calcium salts in teeth and bones. It has been associated with a variety of bodily functions such as the healing of wounds, reproduction, growth, and maintenance of glucose tolerance in the body. All of these functions have been shown to be impaired upon prolonged zinc deficiency.