Key takeaways
Calcium polycarbophil (FiberCon) and psyllium (Metamucil) are both over-the-counter fiber supplements used to treat occasional constipation, but they have some differences. Calcium polycarbophil is a synthetic fiber, while psyllium is a natural fiber from plants. Both are bulk-forming laxatives, but psyllium is more likely to cause gas and bloating. Calcium polycarbophil is available in tablet form, whereas psyllium comes in powder packets, scoopable powder, and capsules. Both need to be taken with plenty of water to avoid choking, but psyllium can also contain potassium and sodium, which might be a concern if you're on a restricted diet. Lastly, calcium polycarbophil is generally considered gentler and less likely to cause stomach cramping compared to psyllium.
