Bob's Red Mill Psyllium Fiber Powder is made from the outer husks of the seed of the psyllium plant that have been ground to a super-fine texture. It is an outstanding source of dietary fiber, and provides a remarkable amount of soluble fiber. Add Psyllium Fiber Powder to smoothies for an easy fiber boost. It can also be used in gluten free or vegan baked goods as a substitute for xanthan gum or eggs.