Sake is an alcoholic beverage that's made from fermented rice that has been polished to remove the bran. The brewing process for sake is similar to that of beer, but the rice is fermented using a unique Japanese ingredient called koji.
It only used four simple and clean ingredients: rice, water, koji, and yeast. Sake is a very clean beverage because it does not contain any sulfites or chemicals like other spirits or wines do. It sometime can have some distilled alcohol added but the reality is that it's a very straightforward beverage as it's made with only this this four simple and clean ingredients.