Glow from the Inside Out: The Beauty Secret of Yam Powder Yam (Dioscorea opposita), also known as Huai Shan and Yam, is a common edible and medicinal plant. Its roots are fat and grow like yams, hence the name yams. Yam is not only widely loved as a delicious ingredient, but also has a wealth of beauty effects. However, as a natural medicine, yam also has