Doctor-RecommendedThe glucosamine sulfate in GS-1500 is up to 98% absorbable, which makes it more readily available to the body to support healthy articular cartilage. Clinical studies show it's a key building block for connective tissue and cartilage.One packet per day is all you needGlucosamine Sulfate is clinically studied to build cartilage, and now comes in an easy-to-use, dissolvable powder. One packet, mixed once a day with water or your favorite beverage, is all you need for optimum joint support.