As it is high in soluble fiber, psyllium can help lower cholesterol as well as provide from relief from constipation and diarrhea. Because of the high fiber content, psyllium can also reduce the risk of heart disease. Psyllium husk is also used to increase the fiber content of foods. Psyllium husk and powder can be taken as a supplement, but you can also mix it in with juices and smoothies. You can also add psyllium husk or powder to other foods, including to soups and stews as a natural thickener. Use psyllium husk in baked goods, including granola, or mixed in with cereal to naturally increase the dietary fiber content.