High-Intensity Support Ultimate Omega Xtra offers the highest-intensity omega-3 benefits with 3400 mg omega-3s plus 1000 IU vitamin D3. This powerful formula supports heart, brain, and mood health, joint mobility, body composition, and optimal immune system function.* About Nordic Naturals Since 1995 Nordic Naturals has been committed to delivering the world's safest, most effective nutrients essential to health.