Symptoms of zinc deficiency: 1. Yellowish hair and short stature. 2.Hand barbs and white spots. 3.Anorexia, picky eating, omnivorous. 4.Thick tongue, map tongue, mouth ulcers. 5.Poor resistance, recurrent eczema. 6.Easy sweating, hyperactivity, inattention. The role of zinc: 1, promote human growth and development. 2, maintain the normal appetite of the human body. 3.Promote the healing of wounded mouth surface. 4.Improve the immunity of human body. 5, maintain the development of male reproductive organs.