Actistatin® Rapid Joint Relief Equine The Only Full Spectrum Glucosamine + Chondroitin + Actistatin is fully patented and 100% pure. The pharmaceutical- grade composition of all four bio-available glucosamines optimizes cartilage repair and hydration by elevating and sustaining levels more effectively than any other brand. Unlike other products that substitute perna mussels or unproven herbal agents in place of true chondroitin sulfate, GLC 5500 contains clinically proven CS A-4 to help reduce degenerative enzymes and speed healing. With Actistain, this all-natural releasing agent helps increase delivery and absorption.