Grizzly 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. Antioxidants like Astaxanthin in Grizzly Krill Oil have been shown to aid in the elimination of free radicals. Due to FDA regulations, we are not allowed to mention the impacts of excess free radicals on your pet’s health, but we welcome you to research that information elsewhere on the web._x000D_ Grizzly Krill Oil is a naturally concentrated product: a 4 ounce bottle will last the average cat (< 25 pounds) at least 4 months; the 8 ounce bottle even longer. For dogs, the 4 ounce bottle will last 2 months for a 50 pound dog, and up to 4 months using the 8 ounce bottle. Every bottle comes with a handy dispenser pump for easy use.