Azuki (Red bean) was one of the main products used for washing the face and body before soap was introduced in Japan. Azuki contains Saponin, which is a natural cleansing agent that removes old keratin, sebum and dirt. It is very mild for the skin, and it won't strip off the oil from your face and pores. Also saponin reduces excessive sebum production which is beneficial for oily skin and acne. Another benefit of Saponin is that it produces a natural foaming action to help remove dead skin cells and tightens and softens the skin, promotes circulation, giving it a healthy, natural glow.