NOW® Neptune Krill Oil is a unique EFA formula that contains a full profile of essential fatty acids, antioxidants and phospholipids. The naturally occurring nutritional compounds in Neptune Krill Oil have been shown in studies to help support a wide range of internal functions, including cardiovascular, cognitive, joint, and immune systems.* It is manufactured under strict quality control standards, and tested to be free of potentially harmful levels of mercury, heavy metals, PCB's, dioxins and other contaminants.