PHOENIX BIOLOGICS VitaCarte - Bovine Tracheal Cartilage 100% pure bovine tracheal cartilage derived from range grown, certified hormone-free cattle. Maximum biological activity proven in clinical trials. Far superior to other cartilage in biological activity. Inspired by dramatic results published in peer-reviewed journals. More than $10 million invested in clinical trials. Over four decades of research and development. Rigorous quality control standards ensure purity & potency. Unique proprietary process, protected by U.S. patent, preserves the molecular structure and maximum biological activity.