Excellent Source of Fiber Soluble fiber from foods such as psyllium seed husks, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease. A serving of whole psyllium husks supplies 6 grams of the 7 grams soluble fiber necessary per day to have this effect. This product is sold by weight not volume. Natural color variation may occur in this product. Only 16 oz. packaging is part of TerraCycle® program.