Naturally found in the body, Glucosamine and Chondroitin are natural building blocks for connective tissue that have been studied extensively by the National Institutes of Health for their role in regenerating cartilage and lubricating joints. Natrol Glucosamine and Chondroitin blends these two powerful joint health ingredients into a formula designed to keep your joints healthy — and comfortable. Easy-swallow smaller tablets. Clinically tested levels. Made in the USA!