What is Krill Oil? Krill oil is derived from tiny, shrimp-like crustaceans known as krill, which are found in the cold waters of the Antarctic Ocean. Krill are a rich source of omega-3 fatty acids, specifically eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), along with antioxidants such as astaxanthin. Krill oil has gained popularity as