Joint, Tendon, Ligament I is formulated with specific ingredients to support joint mobility and the ligament structure.† Cynatine® FLX is a solubilized keratin, a protein found naturally in the body with natural antioxidant activity clinically shown to support joint mobility and resilience.† AprésFlex® is the next-generation Boswellia serrata extract providing enhanced-absorption AKBA for healthy joints.† This formula can be combined with Joint, Tendon, Ligament II if indicated for optimal results.