Krill oil: Krill oil seems to be safe for most adults when used for a short amount of time ( 3 months). Research on krill oil has not adequately evaluated its safety or possible side effects. It is likely that it can cause side effects similar to fish oil such as bad breath, heartburn, fishy taste, upset stomach, nausea, and loose stools. People who are allergic to seafood should avoid it.
Answered 12/9/2013
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