Question: what is the difference between castor oil and cod liver oil?
Answer: Fish oil is extracted from the flesh of tuna, herring, cod and other deep-sea oily fish species. It's rich in omega-3 fatty acids such as EPA and DHA but doesn't have much vitamin A or D. Cod liver oil comes from the liver of the cod fish. It has less omega-3s but is very rich in vitamins A and D.