Each caplet of Fibercon® has the natural action of fiber and contains no chemical stimulants or preservatives, so it works naturally to restore regularity and relieve constipation. The active ingredient of FiberCon is calcium polycarbophil (CPC). CPC is an inert synthetic polymer (compound) with water-absorbing ability, which is higher than natural fibers such as psyllium or carboxymethylcellulose. Calcium polycarbophil is not digested by the human enzymes or the microorganisms in the colon and therefore remains as a solid until it is eliminated from the digestive system. It is comparable to natural bulk fiber laxatives, as it adds bulk volume and moisture to stools to effectively relieve constipation and maintain regularity.