Cod liver oil is a rich source of the omega 3 essential fatty acids epa and dha these two essential fatty acids have been shown to support a number of health related functions cod liver oil is also a good source of vitamin d epa eicosapentaenoic acid and dha docosahexaenoic acid are both long chain fatty acids that have been shown to provide a number of health benefits including reduced blood pressure and cholesterol improved immune function and reduce inflammation they also provide t