Wild krill from Antarctica contain high levels of an inherent antioxidant called Astaxanthin - this is what gives krill its deep red color. Grizzly Krill Oil contains up to 8 times more Astaxanthin than Krill Oil for humans, making it an extremely powerful antioxidant product for dogs and cats. Antioxidants have been shown to aid in the elimination of harmful molecules (free radicals). These inherent antioxidants also help support the health of your pet's liver, ocular, respiratory, cardiovascular & vascular functions, and helps maintain good health in all the body's cells and tissues.