Psyllium, similarly to other soluble fibers, passes through the small intestine without being completely broken down or absorbed. Instead, it absorbs water and becomes a viscous compound that benefits constipation, diarrhea, blood sugar, blood pressure, cholesterol, and weight loss. People use psyllium as a dietary supplement. It is available in the form of husk, granules, capsules, or powder. Manufacturers may also fortify breakfast cereals and baked goods with psyllium. Psyllium husk is the main active ingredient in Metamucil, a fiber supplement that reduces constipation. Taking fiber supplements can help control the body’s glycemic response to a meal, such as reducing insulin and blood sugar levels. In fact, psyllium works better for this mechanism than other fibers, such as bran. This is because the gel forming fibers in psyllium can slow down the digestion of food, which helps regulate blood sugar levels.