See below: Both are good sources of omega-3's & both should be purchased from reliable sources. Major concern is possible mercury contamination, which is more likely & in higher concentration in fish as they are higher in food chain & toxins are more concentrated. Krill come from deep antarctic waters where toxins are less likely to be found. Sources also recommend astaxanthin (an antioxidant) be present.
Answered 4/14/2014
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