Krill are tiny shellfish with oil containing Omega-3 fatty acids. Puritan s Pride Krill Oil 500 mg provides 86 mg of active Ester-Omega? Omega-3 fatty acids per serving which is partially comprised of EPA (Eicosapentaenoic Acid) 40 mg and DHA (Docosahexaenoic Acid) 25 mg Supportive but not conclusive research shows that consumption of EPA and DHA omega-3 fatty acids may reduce the risk of coronary heart disease.**