Zinc is a blue-white metal, soluble in alkali, acetic acid, inorganic acid, insoluble in water, and has high corrosion resistance in the atmosphere. The content of zinc in the human body accounts for about 0.003% of body weight, which is equivalent to about 2 grams of zinc in adults. Zinc of 90% is present in bones and muscles, and the remaining 10% plays an important function in the blood. Zinc is an essential mineral for the human body and is important for the immune system and metabolic function. About 2 billion people in developing countries are affected by zinc deficiency, which causes growth retardation, weakened immunity, diarrhea in children, as well as amenorrhea, sexual dysfunction, narcolepsy, loss of appetite, and reduced IQ.