Fermented rice water: A hair care secret from the Yao Women! Kopryza is an exclusive hair care ingredient made from the fermentation of Black Kavuni rice, a rare variety of rice from South India using Bacillus bacteria. Fermenting rice water enhances the existing vitamins and nutrient levels in it, which nourish your hair follicles. It promotes healthy hair growth and improves the overall condition of your hair. The heavy amino acids present in rice water, in particu-lar, help in the regeneration of hair and aid in faster growth of your hair