Nordic Naturals fish oil plus nutrient formulas combine fish oil with select nutrients providing support for particular concerns. Nordic Naturals Omega Joint Xtra delivers highly absorbable glucosamine sulfate to support healthy joints. Omega Joint Xtra contains UC-II Undenatured Type II Collagen to promote the rebuilding of joint cartilage. Combining fish oil with UC-II, Omega Joint Xtra delivers accelerated support for joint mobility, flexibility and comfort. * This product no longer contains added Vitamin D3.