Psyllium SAPSupport for chronic constipation (science based) Psyllium husk is a well known dietary fiber that has been used in traditional medicine for many centuries. The most common use of psyllium is to relieve constipation by increasing stool production, weight, and improving bowel movements and frequency. Psyllium SAP provides high quality, non GMO psyllium husk that may help improve gastrointestinal health and relieve constipation.