Psyllium husk is indigestible and a source of soluble dietary fiber. It is used to relieve constipation, irritable bowel syndrome, and diarrhea. Other uses include gluten-free baking, where ground psyllium seed husks bind moisture and help make breads less crumbly.
The husks are used whole in their natural state, or dried and chopped or powdered for easier consumption. In either of these forms, one takes them by mixing them with water or another fluid.