Krill Oil is known for its unique fatty acid (FA) profile, which includes EPA and DHA, plus phospholipids. In addition, krill oil naturally has astaxanthin, a powerful free radical scavenger and immune-supporting carotenoid.* Clinical studies have shown that NKO® can help to support joint comfort, healthy blood lipid levels already within normal range, and may help to maintain healthy feminine balance.* The phospholipid-bound forms of EPA and DHA from krill oil have also demonstrated exceptionally high bioavailability.* Neptune Krill Oil is manufactured under strict quality control standards. It is tested to be free of potentially harmful levels of contaminants such as PCBs, dioxins, mercury and other heavy metals. This double strength product has twice the krill oil (1,000 mg per softgel) than our regular strength product (500 mg per softgel). NKO® is a registered trademark of the Aker BioMarine Antarctic AS. US Patent No.: 8,278,351.