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In a study on rats that directly compared krill oil and fish oil supplementation, krill oil reduced liver triglyceride levels significantly more.
Scientists looked at three groups of rats -- one group that consumed a control diet, one group that had its diet supplemented with 2.5 percent krill oil, and a final group that was given 2.5 percent fish oil in its diet. Both krill oil and fish oil significantly inhibited the activity of enzymes that metabolize fat in the liver, but the krill oil had a more pronounced effect.