The active ingredient in Citrucel powder is methylcellulose, which is a nonallergenic fiber. Each teaspoon contains 2 grams of fiber. Methylcellulose is a synthetic, water-soluble fiber derived ...

Citrucel is designed to relieve constipation by adding bulk to your stool, helping it pass through your digestive tract more easily. This is due to its content of methylcellulose fiber (1).

Bulk-forming fiber supplements include psyllium (Metamucil) and methylcellulose (Citrucel). Although fiber supplements are an effective remedy for constipation, more studies and research are ...

But methylcellulose also aids the absorption of water into the intestines, which helps make stools softer, so it's a common ingredient in laxatives like Citrucel. According to the U.S. National ...