Eicosapentaenoic acid (EPA) is an essential omega-3 fatty acid, distinguished from other long-chain polyunsaturated fatty acids by its specific chemical configuration. Bluefish, swordfish, salmon, and mackerel are rich in EPA. EPA has been studied in anorexia, and omega 3 fatty acid supplementation has been evaluated for its effect in fatigue, peripheral neuropathy, and prevention of infection.