Rice bran is the nutrient-dense outer husk of rice grain. It is a good natural source of fiber and contains magnesium, vitamin B6 and iron.NOW Real Food&amptrade; Rice Bran is an excellent natural additive to many baked goods and is primarily used to boost fiber content. It adds a rich texture and imparts a subtle flavor that is ideal for cereals, or as a tasty and nutritious thickening agent for smoothies. Add it to breads and muffins to improve color and taste.