What is cod liver oil cod liver oil 1000mg is a high quality source of omega 3 which is rich in epa eicosapentaenoic acid and dha docosahexaenoic acid why use cod liver oil cod liver oil contains 237mg of omega 3 per soft gel and has many beneficial properties within the body due to the action of epa and dha these two long chain fatty acids help contribute to normal blood cholesterol levels and healthy cardiac function cod liver oil is high in vitamin a which contributes to normal