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Regular fish oil is pressed from the whole body of the fish, while cod liver oil is pressed from the liver of the fish. Both can be good sources of the omega-3 fatty acids DHA and EPA, but cod liver oil contains substantial, and in some cases, excessive amounts of vitamin A, as well as a good amount of vitamin D, which are not generally found in regular fish oil supplements. One type of oil is not necessarily better than the other, but which one you choose should be based on your nutritional needs and your reason for taking it.
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