Wutongzi is the fruit of the sycamore tree, the ancient general use of it to do the size of the pill. The diameter of about 0.5CM size, it is slightly smaller than soybeans, and red beans about the same, the purpose is to facilitate the taking.

Shantung, commonly known as tung tree, Maotong, odoriferous camphor wood, large horse mulberry leaves, scientific name Idesia polycarpa Maxim. Santalum album is a perennial broad-leaved deciduous tree, about 5 meters high. The bark is smooth, and the shoots have yellow hairs. Leaves are alternate, clustered at the ends of branches. The center pole is hollow, light texture.