Metamucil is a bulk-proucing laxative and fiber supplement manufactured by Procter & Gamble. The Metamucil brand has existed since 1934. The active ingredient is psyllium seed husks. It is often used to treat constipation, hemorrhoids, diverticular disease, and irritable bowel syndrome. It may also reduce cholesterol when taken daily. Metamucil is sold in powdered drink mixes, capsules, and wafers. Not only does Metamucil come in a variety of forms it is available in several flavors Orange, Berry, and Pink Lemonade. A sugar-free version is also available.