Neptune Krill Oil (NKO) naturally has Astaxanthin, a powerful free radical scavenger and immune-supporting carotenoid. Clinical studies have shown that NKO can:-Help to support joint comfort-Help support healthy triglyceride and LDL cholesterol levels - cardiovascular support-Cognitive health and brain functionNeptune Krill Oil (NKO) is manufactured under strict quality control standards. It is tested to be free of potentially harmful levels of contaminants (i.e. mercury, heavy metals, PCB's, dioxins, and other contaminants). Neptune Krill Oil (NKO) is a 100% pure, certified sustainable source of krill.