What is the active ingredient in Metamucil?

Metamucil's active ingredient is psyllium, which is derived from the seeds of the Plantago ovata plant. Psyllium is a soluble fiber that works primarily as a bulk-forming laxative. It absorbs water in the intestines, swelling up to form a gel-like substance that helps to promote regular bowel movements and can assist with managing constipation. In addition to its laxative properties, psyllium can also help in lowering cholesterol levels and regulating blood sugar levels, making it beneficial for overall digestive health.

Other ingredients listed are associated with different types of laxatives. Bisacodyl is a stimulant laxative that directly stimulates the bowel muscles to promote movement, while polyethylene glycol is an osmotic laxative that helps retain water in the stool to soften it. Methylcellulose is another bulk-forming agent similar to psyllium but is not the active ingredient in Metamucil. Therefore, psyllium is specifically recognized as the key component responsible for Metamucil’s efficacy as a fiber supplement and laxative.