While you do need fiber in your diet, not all fiber supplements are equal. The psyllium fiber used by Metamucil is much more effective than other sources of fiber, with additional health benefits suggested by multiple studies. One special effect of this fiber is a sponge-like effect of absorbing fats and cholesterol and removing them from your system. It also supports digestive system health and your natural internal-cleansing mechanisms.Metamucil provides both major types of fiber, soluble and insoluble. The soluble fiber in this supplement can lower cholesterol levels, helping decrease your risk of heart disease. Soluble fiber also helps regulate blood sugar, a valuable effect for diabetics or those with metabolic conditions. Insoluble fiber is the form that promotes regularity and helps relieve constipation. Metamucil, with the power of psyllium fiber: no other fiber supplement can compare.