Revolutionary Extended Release (XR) powdered joint supplement for all classes of horses, recommended to support healthy joint function. Extends the release of glucosamine over 24 times longer than other joint supplements. One dose keeps glucosamine in horse's system for a full 24 hours. XR glucosamine releases slowly over time, providing a constant supply of available glucosamine to the joints. Research has shown extended release formulas can extend the action of the active ingredient in the body. Other formulas are released quickly and are only available to the horse for a short period of time. Each 1/2 oz contains 5,000 mg XR glucosamine, 100 mg MSM, 50 mg chondroitin sulfate, 50 mg Ester-C, 10 mg hyaluronic acid and 10 mg manganese sulfate.