Key Takeaways:
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Both fish oil and krill oil can help you increase EPA and DHA intake, the two omega-3s most often studied for heart, brain, and overall wellness.
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Krill oil omega-3s are typically bound to phospholipids, which may support efficient absorption for some people, while fish oil usually offers more EPA+DHA per capsule and is often more budget-friendly.
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The “best” omega-3 is the one you’ll actually take consistently, one that fits your family’s routine, your budget, and your comfort level around sourcing and sustainability.
Maybe you grabbed omega-3s once, forgot them in the pantry, and now you’re trying again, because you want an option that fits real family life, not a complicated routine. When labels indicate fish oil on one shelf and krill oil on the next, things can become quite confusing. This guide breaks down the differences, so you can choose confidently and keep it simple.
Both fish oil and krill oil can be good options because they deliver the same two headline omega-3s, EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). The differences come down to how those omega-3s are packaged (chemically), how much you typically get per serving, how they’re sourced, and what you’re willing to spend.
If you’re looking for Omega-3 options, NaturesPlus Antarctic Krill Oil (easy-to-swallow softgels), Ultra Omega 3/6/9™ Softgels (a blend of fish, borage, and flax oils for a broader omega profile), and Animal Parade® Omega 3/6/9 Junior Softgels are good places to start.*
Key Differences at a Glance: Form, Dose, Taste, Cost, and Sourcing
Think of fish oil and krill oil as two different “delivery systems” for omega-3s. The destination is similar (EPA and DHA in your diet), but the route can feel different.
Chemical Form: How Your Body Receives Omega-3s
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Fish oil provides EPA and DHA mostly as triglycerides or ethyl esters (this varies by product and processing).
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Krill oil provides EPA and DHA largely bound to phospholipids.
Some studies suggest phospholipid-bound omega-3s may be absorbed efficiently, which is one reason you’ll sometimes see krill oil marketed as “highly absorbable.” In real life, absorption depends on several factors, including your diet, whether you take it with a meal, and the exact product formulation.
Krill oil also naturally contains astaxanthin, a reddish antioxidant that contributes to krill oil’s color.
Dose and Cost: How Much EPA + DHA You Get Per Serving
The front label might say “1,000 mg fish oil” or “500 mg krill oil,” but the number that matters most is:
How much EPA + DHA are you getting per serving?
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Many standard fish oil softgels provide more EPA + DHA per capsule than krill oil softgels.
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Many krill oil products provide a smaller amount of EPA + DHA per capsule, which can mean more capsules if you’re targeting a higher intake.
That said, some research suggests krill oil may raise blood omega-3 levels at lower doses in some settings, which is one reason some families find it worth the higher cost.
Tip: When comparing price tags, compare cost per 100 mg of combined EPA + DHA rather than cost per bottle.
Taste and Tolerability: “Fishy Burps” and Sensitive Stomachs
If you’ve tried fish oil before and didn’t love the aftertaste, you’re not imagining it. Some products cause more “repeat” than others.
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Many people report fewer fishy burps with krill oil, often because capsules are smaller and products can be formulated differently.
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Fish oil quality varies widely. Enteric-coated fish oil or taking it with a meal that contains fat can reduce aftertaste.
If your stomach is sensitive, start low, take it with food, and consider splitting the dose (morning + evening) if your healthcare professional says it’s appropriate.
Allergies and Dietary Fit
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Shellfish allergy? Avoid krill oil unless your clinician specifically advises otherwise.
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Prefer a non-fish option? Algae-based omega-3 supplements provide DHA (and sometimes EPA) without fish or shellfish.
Sourcing and Sustainability: Making a Planet-Friendly Choice
You don’t have to be an ocean expert to make a more responsible choice. You just need a few practical checks.
Krill: Regulated Harvesting Under CCAMLR
Antarctic krill fishing is managed under an international framework called CCAMLR (Commission for the Conservation of Antarctic Marine Living Resources).
Reputable sustainability organizations note that krill is a keystone species in the Antarctic ecosystem, which is why krill fisheries are closely monitored. Krill catch limits are designed to be conservative, and independent observers can be involved in the monitoring process.
For context, the Marine Stewardship Council (MSC) explains that krill catch limits have been set at about ~1% of estimated krill biomass in designated areas, and that in 2023, 75.27% of Antarctic krill harvested came from fisheries certified to the MSC standard. (The MSC also notes the krill fishery reached a trigger catch limit and was closed in August 2025, which is an example of how management rules can be enforced when limits are met.)
Fish Oil: Look for Small Fish and Strong Standards
Many high-quality fish oils are derived from small, short-lived fish species such as anchovies and sardines, which can be a more sustainable choice than oils sourced from larger predatory fish.
To keep it simple, look for:
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Transparent sourcing (species + harvest region)
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Responsible certifications (see next section)
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Clear purity testing
Fish Oil vs Krill Oil: Who Might Prefer Which?
Here’s a simple way to match the choice to real family life.
You Might Prefer Fish Oil If…
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You want more EPA + DHA per serving (often fewer capsules for higher intakes).
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You’re budget-conscious and want lower cost per mg.
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You’re avoiding shellfish.
You Might Prefer Krill Oil If…
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You want smaller softgels that are easy to swallow.
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You’ve struggled with fishy aftertaste in the past.
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Sustainability and sourcing are top priorities, and you’re choosing a product tied to strong standards.
You Might Prefer Algae Omega-3 If…
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You don’t eat fish or shellfish.
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You want a direct source of DHA (and sometimes EPA) from algae.
If you’re still torn, choose the option that feels easiest to take consistently, because steady, everyday habits matter more than chasing the “perfect” label.
Fish Oil vs Krill Oil: Frequently Asked Questions (FAQs)
When choosing between omega-3 options, these fish oil vs krill oil FAQ answers address practical questions that naturally arise about absorption, safety, and alternatives.
Is krill oil better absorbed than fish oil?
Some studies suggest krill oil’s phospholipid form may support efficient absorption, but results vary by product and person. The best approach is to choose a quality product and track how consistently you can take it.
Which one is better for heart support?
Both can support heart wellness, especially when they help you meet an EPA + DHA goal that fits your diet. If you have high triglycerides or a heart condition, ask your clinician whether a specific dose (or prescription omega-3) is more appropriate.
Are there side effects or interactions to know about?
Some people notice mild digestive upset or an aftertaste. If you take blood thinners, have a bleeding disorder, or have surgery scheduled, talk with your healthcare provider before taking higher-dose omega-3 supplements.
How can I tell if my omega-3 supplement is “clean”?
Look for brands that provide third-party testing or participate in recognized quality programs, and that are transparent about sourcing and manufacturing. “Clean” isn’t just a claim, it should be supported by documentation.
Can kids take fish oil or krill oil?
A food-first approach is usually the easiest for kids: fatty fish (when appropriate), walnuts, chia seeds, or fortified foods can help. If you’re considering supplements for a child, check in with your pediatrician to confirm the right type and dose for their age.
When should I take omega-3s?
Most people tolerate omega-3s best with food, especially a meal that contains some fat. Consistency matters more than the exact time of day.
The Best Omega-3 Is the One That Fits Your Life
Fish oil and krill oil aren’t rivals so much as two valid ways to add EPA and DHA to your routine. If you want a budget-friendly path to higher EPA + DHA, fish oil can be a great fit. If you prefer smaller, softer gels, less aftertaste, and the phospholipid form found in krill, krill oil may feel easier to stick with.
Whatever you choose, make it easy: pair it with a daily habit (coffee, breakfast, dinner cleanup, anything that already happens) and focus on consistency, not perfection.
When you’re ready to make omega-3s an easy daily habit, try NaturesPlus Antarctic Krill Oil, Ultra Omega 3/6/9™ Softgels, or Animal Parade® DHA Kidz Children’s Chewables for kids.*
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
IMPORTANT DISCLAIMER
The information in this blog is provided for educational purposes only and is not a substitute for consultation with a doctor or qualified healthcare professional. Consultation with a doctor or qualified healthcare practitioner is strongly advised before starting any regimen of supplementation, a change in diet, or any exercise routine. Individuals who engage in supplementation to promote health, address conditions, or support any structure or function of the body assume all risks. Women who are pregnant, especially, should seek the advice of a medical doctor before taking any dietary supplement or making any change in diet or lifestyle. Descriptions of herbs, vitamins, nutrients, or any ingredients are not recommendations to take our products or those of any other company. We are not doctors or primary-source science researchers. Instead, we defer to the findings of scientific experts who conduct studies, as well as those who compile and publish scientific literature on the potential health benefits of nutrients, herbs, spices, vitamins, or minerals. We cannot guarantee that any individual will experience any of the health benefits associated with the nutrients described. Natural Organics will not be held liable for any injuries, damages, hindrances, or negative effects resulting from any reliance on the information presented, nor will Natural Organics be held accountable for any inaccuracy, miscalculation, or error in the scientific literature upon which the information provided is based.
