Metamucil with psyllium fiber is a fiber supplement that helps to promote digestive and heart health* (*As part of a diet low in saturated fat and cholesterol. Use as directed.); Love your heart and help lower your cholesterol with Metamucil. Mix Metamucil powder into at least 8 ounces of water for a delicious, convenient way to add fiber to your diet. One adult serving of Metamucil has 3 grams of fiber. (As part of a diet low in saturated fat and cholesterol); Psyllium fiber; The only leading fiber supplement brand proven to help lower cholesterol*. With 100% natural psyllium fiber. (*As part of a diet low in saturated fat and cholesterol. Use as directed.)