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Researchers at Akershus University College, Norway, ran a study on comparing the effects of krill oil vs fish oil on
serum lipids. Here is the description of the study:
One hundred thirteen subjects with normal or slightly elevated total blood cholesterol and/or triglyceride levels were
randomized into three groups and given either six capsules of krill oil (N = 36; 3.0 g/day, EPA + DHA = 543 mg) or
three capsules of fish oil (N = 40; 1.8 g/day, EPA + DHA = 864 mg) daily for 7 weeks. A third group did not receive
any supplementation and served as controls (N = 37). They found a significant increase in plasma EPA, DHA, and
DPA was observed in the subjects supplemented with n-3 PUFAs as compared with the controls, but there were no
significant differences in the changes in any of the n-3 PUFAs between the fish oil and the krill oil groups. No
statistically significant differences in changes in any of the serum lipids or the markers of oxidative stress and
inflammation between the study groups were observed.
The authors concluded that "Krill oil and fish oil thus represent comparable dietary sources of n-3 PUFAs, even if
the EPA + DHA dose in the krill oil was 62.8% of that in the fish oil."
Please note that the amount and concentration of EPA/DHA in these two products - Fish oil Vs Krill oil are different.
Ulven SM, et al, Metabolic effects of krill oil are essentially similar to those of fish oil but at lower dose of EPA and
DHA, in healthy volunteers. Lipids. 2011 Jan;46(1):37-46.