test-Krill Oil Vs. Fish Oil: Which Has More Benefits?
Vitamins & Supplements
Krill Oil Vs. Fish Oil: Which Has More Benefits?
Amy Sunderman, MS, RD • February 21, 2022

Benefits of Krill Oil vs. Fish Oil

Less than a decade ago, fish oil caused quite a stir. Almost 19 million adults in the U.S. used fish oil supplements by 2012, making it the most popular natural product used that year.1 The widely-studied benefits of fish oil and the healthy omega-3 fatty acids it provides made this supplement an obvious choice. But recently, nutritional researchers and health-conscious consumers alike are turning their attention toward krill oil for a few excellent reasons.

Like fish oil, krill oil is naturally loaded with healthy omega-3 essential fatty acids — namely Eicosapentaenoic Acid (EPA) and Docosahexaenoic Acid (DHA). Omega-3 essential fatty acids may support cardiovascular health, healthy cognitive function, joint health and a lot more.2 But krill oil may also offer some advantages over other marine oils for getting your daily dose of omega-3s.

Difference Between Krill Oil and Fish Oil

With krill oil supplements becoming so popular, many people are wondering about the most significant differences between krill oil and fish oil. You may have taken fish oil for a long time and now wonder if it’s worth switching from fish oil to krill oil, or you may be new to taking omega-3 supplements altogether. Either way, in this article we hope to answer all your questions about the differences between the two oils and the potential advantages of both.

Fish Oil vs Krill Oil

There are several differences between fish oil and krill oil, including the sources of the oils used in the supplements, the nutrients and nutritional values within the supplements and how your body absorbs those nutrients.

1. Is Krill Oil the Same as Fish Oil?
Although both supplements contain omega-3 fatty acids and the sources for both supplements are ocean-dwellers, the two oils come from very different places.

Fish oil can come from a variety of fish including anchovies, halibut, herring, mackerel, salmon, sardines, cod and albacore tuna. The fish used for making fish oil supplements may be either wild-caught or farmed.

Krill, on the other hand, are very tiny, shrimp-like crustaceans that live in the waters of Antarctica and feed on plankton.3 Because they are in the same family as shrimp, people who have shellfish allergies should avoid taking krill oil supplements.

2. Krill Oil May Be Absorbed Better Than Fish Oil
Research suggests that although both supplements contain EPA and DHA omega-3 fatty acids, the fatty acids from krill may be absorbed better by our bodies.4 The omega-3 fatty acids in krill are bound to phospholipids4 which allows them to be released into the bloodstream and cells at a more efficient rate. As a result, you might be able to take less (which could mean smaller, potentially easier to swallow pills) and still enjoy the same health benefits as fish oil. And as a bonus, krill oil doesn’t cause fishy burps like fish oil can.

3. Krill Oil Contains Other Nutrients
Krill oil also contains other nutrients such as phospholipids, choline, and astaxanthin, the carotenoid antioxidant. Choline is an essential precursor to acetylcholine, a stimulatory neurotransmitter. It's involved in healthy brain function and essential for normal cellular function.

Astaxanthin is a high-powered antioxidant with a molecular structure that makes it very effective at neutralizing free radicals. This super-carotenoid offers many benefits of its own that are complementary to the benefits of omega-3 fatty acids, including supporting healthy skin,5 eyes,6 weight7 and brain health. You can read more about astaxanthin in the article Astaxanthin Benefits.

Is Krill Oil Better Than Fish Oil?

The omega-3 fatty acids in krill oil may be more accessible for your body to absorb, and you get a few bonus nutrients in krill oil as well, but there are some situations in which fish oil may be a better choice. Most importantly, people who are allergic to shellfish shouldn’t take krill oil supplements, but if they don’t have allergies to other types of fish, they may be able to take fish oil (just read the label carefully and consult with your doctor).

Fish oil may also provide other advantages, including higher total concentrations of DHA and EPA per supplement, and fish oil is usually less expensive than krill oil. But remember that your body may absorb the omega-3 fatty acids from krill more readily than fish oil, so the lower amount of DHA and EPA in krill oil may be better absorbed than the higher amounts listed in fish oil.

Which is Better: Krill Oil or Fish Oil?

To demonstrate some of the differences between the nutrients in fish oil vs. krill oil, we’ve broken down a few of our favorite fish oil and krill oil formulas:


Krill Oil Dosage

There is no standard intake of fish oil, krill oil or any other omega-3 supplement. An appropriate dose depends on age, health and other conditions.8 If you’re not sure how much you should take, check with your doctor or nutritionist first, but research has provided some intake suggestions. Studies have shown that consuming at least 200 mg of DHA9 and 220 mg of EPA10 daily is linked with potential health benefits, including heart health, cognitive support, behavioral health, mood support and more.8,10 And the American Heart Association recommends one gram of combined EPA and DHA daily to support heart health.11

Since the omega-3 fatty acids in krill oil are more easily absorbed than standard fish oil, you may be able to take smaller doses of omega-3 fatty acids from krill oil and still get the same benefits. Most krill oil supplements are available in doses of one gram, providing around 120 mg of DHA and 55 mg of EPA per dose, along with 80 mcg of astaxanthin.

Our Commitment to Sustainable, Eco-Friendly Krill Oil

Promoting your personal health without putting the health of the environment or marine ecosystems in jeopardy is the best scenario. Environmentally conscious consumers are concerned that commercially harvesting krill could threaten the many marine animals that rely on krill as the main component of their diet. At Swanson Health, we completely understand those concerns and we think it’s essential to opt for sustainable supplements, which is why we work with suppliers that care as much about sustainable, eco-friendly practices as we do.

The krill biomass is among the largest on the planet, and just a small fraction is caught each year for human nutrition. We would need to consume much more krill to cause overfishing, and to make sure that doesn’t happen, we use Superba2™ krill oil for many of our supplements.

Superba2™ krill oil is produced by Aker BioMarine of Norway, which uses patented Eco-Harvesting technology to ensure optimal freshness and prevent unnecessary bycatch. Eco-Harvesting results in minimal environmental impact, reflecting Aker’s commitment to sustainable fishing practices. In fact, when the Sustainable Fisheries Partnership released its sustainability overview of fisheries for 2015, Aker BioMarine was the only fishery to receive an “A” rating!

Krill Oil or Fish Oil?

In short, this oil is krillin’ it in the omega-3 nutrition scene. Given the potential advantages of krill oil over fish oil, it should come as no surprise that krill oil is quickly becoming the most popular source of essential fatty acids.

We hope this post has helped you better understand the differences between krill oil and fish oil, and we would love to hear your thoughts. Have you tried one or both of them? Did you take fish oil supplements then switch to krill oil? If so, did you notice a difference? We would love to hear about your experiences in the comments below.

If you're looking for a vegan source of omega-3 fatty acids, try our award-winning Plant Based Omega-3 supplement, which was named 2018 Omega-3 Product of the Year by NutraIngredients USA.

And since we’re on the topic of healthy fatty acids, you might want to check out these posts as well: The Benefits of Krill Oil and Be Fat Fluent: Best Fatty Foods for Your Diet.

Amy Sunderman, MS, RD, Director of Science & Innovation Registered Dietitan

About Amy Sunderman, MS, RD

Amy is a registered dietitian, nutritionist and author with more than 20 years of experience in the supplement industry. Amy is passionate about dietary supplements and the health benefits they offer. She enjoys working to find novel nutritional ingredients with strong clinical research behind them to drive innovation and provide health-promoting products to consumers.

*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.


1. Most Used Natural Products. Fish Oil. https://nccih.nih.gov/research/statistics/NHIS/2012/natural-products/omega3

2 Omega-3 fatty acids. University of Maryland Medical Center. https://www.umm.edu/health/medical/altmed/supplement/omega3-fatty-acids

3 Krill. National Geographic. https://www.nationalgeographic.com/animals/invertebrates/group/krill/

4 The Health Benefits of Krill Oil versus Fish Oil. University of Washington. http://depts.washington.edu/nutr/wordpress/wp-content/uploads/2015/03/Krill-vs-Fish-Oil2012.pdf

5 Preventative effect of dietary astaxanthin on UVA-induced skin photo aging in hairless mice. US National Library of Medicine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5295690/

6 Effect of Multiple Dietary Supplement Containing Lutein,
Astaxanthin, Cyanidin-3-Glucoside, and DHA on Accommodative Ability. US National Library of Medicine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4997915/

7 Natural products and body weight control. US National Library of Medicine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3336927/

8 Krill Oil Overview, Uses, Side Effects. WebMD. https://www.webmd.com/vitamins-supplements/ingredientmono-1172-krill%20oil.aspx?activeingredientid=1172

9 Health benefits of docosahexaenoic acid (DHA). PubMed. https://www.ncbi.nlm.nih.gov/pubmed/10479465

10 Eicosapentaenoic acid (EPA). University of Maryland Medical Center. https://www.umm.edu/health/medical/altmed/supplement/eicosapentaenoic-acid-epa

11 Vitamin Supplements: Hype or Help for Healthy Eating. American Heart Association. https://healthyforgood.heart.org/eat-smart/articles/vitamin-supplements-hype-or-help-for-healthy-eating.