Wild krill from the pristine waters of Antarctica contain high levels of a natural antioxidant called Astaxanthin: this is what gives krill its deep red color. Our Krill Oil contains up to EIGHT times more Astaxanthin than Krill Oil for humans, making it an extremely powerful antioxidant product for dogs and cats. Our Krill Oil is an obvious choice for anyone wanting to safeguard their pet against the harmful actions of free radicals—the unstable molecules created primarily during digestion.