The #1 selling omega-3 in the US with added vitamin D3. With concentrated levels or omega-3s and 1000I.U. vitamin D3 for additional bone, mood, and immune support, Ultimate Omega®-D3 promotes heart and brain health, joint mobilty and optimal wellness. Every batch of Nordic Naturals fish oils is tested by a third-party certified lab for environmental toxins, including heavy metals. All fish oils are in the triglyceride form and surpass the strictest international standards for purity and freshness. Certificates of Analysis available upon request. - Wild caught. Pure. No fishy aftertaste. Friend of the Sea certified.