Citrucel contains fiber for irregularity that won't cause excess gas (Based on laboratory testing. Individual results may vary)Clinically proven effective to help relieve occasional constipation (When used as directed)Citrucel powder contains Methylcellulose Fiber, which is a non toxic, non allergenic, and non irritant fiberGreat tasting, orange flavored powder that gently helps relieve irregularity (When used as directed)Citrucel is recommended by physicians (Among therapeutic fiber laxatives)