Benefiber fiber supplement powder has less fiber per serving than Metamucil original course powder, according to Benefiber and Meta Wellness. Benefiber has three grams of fiber per 2-teaspoon serving, compared with 6 grams found in a 2-teaspoon serving of Metamucil.
Out of the total fiber contents, Benefiber contains 3 grams of soluble fiber, states Benefiber, whereas Metamucil contains 5 grams of soluble fiber, according to Meta Wellness. The fiber found in Benefiber is wheat dextrin, which the company claims to be a non-thickening natural fiber supplement. Metamucil fiber comes from natural psyllium fiber, states Meta Wellness. Customers take both supplements by dissolving them in a liquid beverage of choice.