Brand names: Metamucil, Fiberall, Hydrocil, Konsyl, Perdiem, SerutanPsyllium is a fiber supplement that can be taken every day to bulk up stool, making it easier to pass. It works by breaking down in the gut and becoming a food source for the "good bacteria" there. It is used for treating constipation, irritable bowel syndrome (IBS) and diverticulosis. In addition, psyllium may also lower cholesterol levels by 10 to 15 percent. On the downside, psyllium does contain calories and may cause gas.
Brand name: CitrucelMethylcellulose is a fiber that is nonallergenic, non-fermentable, can be taken every day, and is created from the cell wall of plants. It is not absorbed by the intestinal tract but instead absorbs water to create a softer stool. Methylcellulose is often used to treat constipation, diverticulosis, irritable bowel syndrome, and some cases of diarrhea. Because it does not ferment, it is less likely to cause intestinal gas.
Brand names: Fibercon, Fiber-Lax, Equalactin, MitrolanSimilar to methylcellulose, polycarbophil is created from plants and is not absorbed by the body. It absorbs water in the intestinal tract and creates a bulkier and softer stool. Polycarbophil is less likely to cause bloating and can be used long term. It may be used to treat constipation, IBS and diverticulosis. This form of fiber is not appropriate for people who have difficulty swallowing.