Nuka is formed during the process of polishing genmaiand is most commonly used to make tsukemono. It contains protein, fibre, calcium, phosphorous, iron and vitamins A, B1 and B2. Its alkaline quality is effective in the regeneration of new, smooth skin, making it an excellent beauty product. The fibre content can help remove cancer-causing elements by discharging toxins from the body. It is beneficial in treating diabetes, reducing blood cholesterol rates and preventing sclerosis of the arteries.