The effects of rice water is further enhanced if it is left to ferment. Fermented rice water is rice water that is left to ferment and has gone slightly sour. It is rich in antioxidants, minerals, B vitamins, vitamin E, and traces of pitera, a substance produced during the fermentation process. ‘Pitera’ has grown in popularity recently, and is touted as the anti-aging elixir due to its ability to promote cell regeneration, and help skin stay young and beautiful.