Yam is the common name for some plant species in the genus Dioscorea (family Dioscoreaceae). Yam contains choline, 16 amino acids, polyphenol, protein, carbohydrates, vitamins and various components of starch and iodine, calcium, iron, phosphorus. Yam is rich in mucin. Mucin is a protein polysaccharide mixtures, on the human body has a special role in health, skin care can prevent aging and maintaining skin elasticity.