Before conducting a study on humans, researchers will often perform animal studies to see if there is a potential benefit for people. Krill oil was given to lab rats to see what the effect on cognition and depression would be if any.
The rats were given krill oil for 7 weeks and evaluated for cognition. A group of the subjects were given an antidepressant to see if there would be a significant difference with krill oil.
The found that krill oil improved cognition and did as well for depression as the antidepressant. The study authors believe this might be due to the combination of omega-3 fats and astaxanthin found in krill oil.
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