Purity, Freshness - 3rd Party Tested With Shellfish-Free Glucosamine Sulfate and Undenatured Type II Collagen Omega-3 Formula to Support Joints, Cartilage, and the Body"s Natural Anti-Inflammatory Response Dietary Supplement Pharmaceutical Grade* Molecularly Distilled*Every batch is third-party tested for environmental toxins, including heavy metals, dioxins, and PCBs. All Nordic Naturals fish oils surpass the strictest international standards for purity and freshness. Certificates of analysis available upon request.Like Omega Joint, Nordic Naturals Omega Joint Xtra combines concentrated omega-3 fish oil with glucosamine sulfate to synergistically promote joint comfort, mobility, and flexibility. To increase effectiveness Omega Joint Xtra has added UC-II undenatured Type II Collagen to accelerate the benefits, enhancing joint health and comfort.