The husk of psyllium is the actual coating of mucilage around the seed. It is considered a pure dietary fiber. Its nutritional value consists mainly of glycosides, proteins, polysaccharides, vitamin b1, and choline. Fiber content of over 80% compared to less than 15% for oat bran and 10% for wheat bran. The husk is composed mostly of a fiber called hemicellulose which is a complex carbohydrate found in whole grains, fruits and vegetables. Hemicellulose is indigestible, however, it is partially broken down in the colon and feeds the friendly intestinal flora.