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Krill oil comes from krill, tiny shrimp-like creatures that live in very cold ocean waters. Krill oil might have health benefits similar to those of fish oil.

Why do people take krill oil?

Krill oil contains EPA and DHA, the same omega-3 fatty acids in fish oil, although usually in smaller amounts. The effects of krill oil have not been researched as thoroughly as those of fish oil. But a few preliminary studies suggest that krill oil could be superior in some ways. Krill oil might be better absorbed in the body than fish oil.

One study of krill oil found that it was more effective than fish oil in improving cholesterol levels, triglycerides, and blood glucose.

Another study found that krill oil, like omega-3s in general, could improve rheumatoid arthritis and osteoarthritis symptoms such as pain, stiffness, and functional impairment. It also lowered levels of C-reactive protein, a marker for inflammation in the body that's been linked with heart disease.

In addition, krill oil seems to ease menstrual cramps. One study found that women who took it needed fewer painkillers.

Because some studies indicate that the fatty acid DHA may benefit a developing child’s brain, krill oil is sometimes taken by pregnant women or given to children. Experts do not recommend this, however, since safety or efficacy of krill oil in pregnant women and children has not been proven.

As krill oil becomes more popular, some scientists are concerned about the environmental impact of large-scale krill harvesting. Krill are an important food source for many animals, including whales, seals, and penguins and other birds.

How much krill oil should you take?

Since krill oil is not an established treatment, there's no standard dose. Talk to your health care provider to see if krill oil is right for you.

Can you get krill oil naturally from foods?

The only source of krill oil is krill.

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