UC-II Advanced Joint Relief, 60 Vegetarian Capsules, NOW FoodsNOW Foods UC II Advanced Joint Relief Joint Health Supplement. With Undenatured Type II Collagen. Plus Hyaluronic Acid, Boron, Vitamin D 3. Promote optimal joint health and mobility with Advanced UC II Joint Relief, featuring UC II, a patented form of collagen with undenatured type II collagen. Undenatured type II collagen is the principal structural protein in cartilage that gives it tensile strength and toughness. It works with the immune system to