As far as omega-3 fatty acids are concerned, you get as much benefit from fish oil capsules as you get from the fish itself. This according to a researcher at the University of South Dakota, Dr. William S. Harris.
Nevertheless, Harris said he would encourage people to eat fish rather than relying on fish oil capsules. "Fish of course brings with it proteins and minerals and other factors that are good for our health that the capsules don't bring, but we weren't able to measure any of those things," he said.
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