Oat Fiber is the product of grinding the oat hull, which is the outer layer shell of the oat kernel. Oat Fiber acts as a perfect substitute for wheat flour for creating gluten-free or low-carb keto recipes. It can be used alone, or in tandem with other flours such as almond or coconut flour. Also, oat Fiber is an excellent source of dietary fiber making it a great addition to your diet.