Comprised of 99% psyllium hydrophilic mucilloid which is a natural substance that comes from the husk of the psyllium seed. The psyllium husk has a soluble fiber content of over 80% compared to less than 15% for oat bran and 10% for wheat bran. They are combined with special flavoring to make the product more palatable for your horse. This makes it easier to feed and causes less waste than powdered products.