The fiber in Metamucil® is proven to lower cholesterol.* The fiber in Metamucil helps modulate blood glucose levels after meals.** Plus, if you're on a low-carb diet, you'll love the fact that Metamucil Capsules contain zero net carbs and 100 percent natural fiber. A high-fiber diet helps you feel full. At 3 grams of dietary fiber per serving, taken up to three to four times per day, you can add as much as 9 grams of dietary fiber to your diet with Metamucil. Metamucil is the number-one doctor- and pharmacist-recommended fiber brand.