Cod liver oil comes from cod, while fish oil is taken from various fatty fish. Both are good sources of omega-3s and can help support heart health.

Both haddock and cod are healthy, but cod may be better for blood pressure and heart health due to its lower sodium content and higher omega-3 fatty acids.

Both fish are nutritious and low in fat, but small differences in vitamin B12, sodium, and omega-3s may influence which one is better for your health goals.