Krill Oil: What It Is, Benefits, Dosage, and Sources

Nutrienting Team

March 1, 202615 min read

Krill oil is an omega-3 fatty acid supplement derived from krill, small, shrimp-like crustaceans found in the Antarctic Ocean. Like fish oil, krill oil is a source of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), two types of omega-3s known for their potential health benefits. However, krill oil differs from fish oil in its molecular structure, primarily in how these fatty acids are stored and delivered within the body. In krill oil, a significant portion of EPA and DHA is bound to phospholipids, while in fish oil, they are predominantly bound to triglycerides. This structural difference is often highlighted as a factor influencing absorption and bioavailability.

Understanding Krill Oil: Uses, Components, and Considerations

Krill oil is primarily recognized as a dietary supplement. Its main components are omega-3 fatty acids (EPA and DHA), phospholipids, and astaxanthin. Astaxanthin is a powerful antioxidant that gives krill its reddish-pink color and is also present in the oil.

The omega-3 fatty acids in krill oil are the primary drivers of its perceived health benefits. These essential fats play roles in various bodily functions, including cellular structure, inflammation regulation, and neurological processes. The phospholipid form of omega-3s in krill oil is thought by some researchers to enhance their absorption into cells, particularly brain cells, compared to the triglyceride form found in most fish oils.

Practical implications of choosing krill oil often revolve around its potential benefits versus its cost and sustainability. While some studies suggest superior absorption, the clinical significance of this difference in human health outcomes is still an active area of research. For individuals seeking omega-3 supplementation, krill oil presents an alternative to fish oil, particularly for those who experience "fishy burps" with fish oil, as krill oil is often reported to cause fewer such side effects.

However, considerations extend beyond personal preference. The harvesting of krill needs to be managed carefully to avoid impacting the Antarctic ecosystem, which relies on krill as a foundational food source for many species, including whales, seals, and penguins. Reputable krill oil manufacturers often adhere to certifications from organizations like the Marine Stewardship Council (MSC) to ensure sustainable fishing practices.

Health-Promoting Benefits of Krill Oil

The potential health benefits of krill oil largely stem from its omega-3 fatty acid content, particularly EPA and DHA, and its antioxidant, astaxanthin. Research into these benefits is ongoing, with studies exploring various aspects of human health.

One area of focus is cardiovascular health. Omega-3 fatty acids are known to contribute to maintaining healthy triglyceride levels, supporting blood vessel function, and potentially influencing blood pressure. Some studies have indicated that krill oil may be effective in reducing triglyceride levels and improving other markers of heart health. For instance, a meta-analysis might review multiple studies on krill oil's impact on lipid profiles, offering a broader perspective on its efficacy.

Another area of interest is inflammation. Chronic low-grade inflammation is linked to various health issues. EPA and DHA have anti-inflammatory properties, and astaxanthin is also a potent antioxidant that can help combat oxidative stress, which contributes to inflammation. This dual action could make krill oil a valuable supplement for managing inflammatory conditions. For example, individuals with mild joint discomfort might consider krill oil, though it's important to understand it's not a substitute for prescribed medications for severe inflammatory diseases.

Brain health and cognitive function are also subjects of investigation. DHA is a major structural component of brain tissue, and omega-3s are involved in neurotransmitter function and neuronal membrane fluidity. Studies are exploring whether krill oil supplementation can support cognitive performance, memory, and mood, particularly in aging populations.

For women's health, some research suggests krill oil may help alleviate symptoms associated with premenstrual syndrome (PMS) and dysmenorrhea (painful menstruation). The anti-inflammatory effects of omega-3s might play a role in reducing the severity of these symptoms.

Finally, skin health is another emerging area. The antioxidant properties of astaxanthin, combined with the anti-inflammatory effects of omega-3s, could contribute to skin protection against environmental damage and support overall skin integrity. This is explored further in the context of krill oil's nutraceutical potential.

It's important to approach these potential benefits with a balanced perspective. While promising, many findings require further confirmation through larger, long-term clinical trials. Individual responses to supplements can vary, and it's always advisable to consult with a healthcare professional before starting any new supplement regimen.

Krill Oil: Benefits, Dangers, and Side Effects

While krill oil offers potential benefits, it's important to be aware of its possible dangers and side effects. As with any supplement, it's not suitable for everyone and may interact with certain medications.

Potential Benefits Summarized

Heart Health: May help lower triglyceride levels, improve cholesterol ratios (increasing HDL, or "good" cholesterol, and potentially decreasing LDL, or "bad" cholesterol, in some cases), and support overall cardiovascular function.
Anti-inflammatory Effects: Omega-3s and astaxanthin work together to reduce inflammation and oxidative stress throughout the body, potentially benefiting conditions like arthritis.
Brain and Cognitive Function: DHA is essential for brain development and function, and krill oil may support memory, focus, and mood.
Joint Health: Reduction in inflammation can lead to decreased joint pain and improved mobility for some individuals.
Skin Health: Antioxidant properties of astaxanthin may help protect skin from damage and support its health.
PMS Symptom Relief: Some studies suggest it can reduce pain and emotional symptoms associated with PMS.

Potential Dangers and Side Effects

Despite its benefits, krill oil is not without potential downsides.

Side Effects:

The most common side effects are typically mild and gastrointestinal in nature:

Digestive Upset: Nausea, indigestion, loose stools, or diarrhea can occur, especially with higher doses.
"Fishy" Aftertaste or Burps: While often less pronounced than with fish oil, some individuals may still experience a fishy taste or burps.
Allergic Reactions: Individuals with shellfish allergies should avoid krill oil, as krill are crustaceans. An allergic reaction can range from mild (hives, itching) to severe (anaphylaxis).

Interactions and Contraindications:

Blood Thinners: Krill oil, like other omega-3 supplements, can have a mild blood-thinning effect. This means it can increase the risk of bleeding when taken with anticoagulant (blood thinner) medications such as warfarin, aspirin, clopidogrel, or even certain herbal supplements like ginkgo biloba. Individuals on blood thinners should consult their doctor before taking krill oil.
Surgery: Due to its potential blood-thinning effects, it's generally recommended to stop taking krill oil at least two weeks before any scheduled surgery to minimize the risk of excessive bleeding.
Diabetes Medication: While not a definitive contraindication, some research suggests omega-3s might slightly affect blood sugar levels. Individuals with diabetes should monitor their blood sugar closely if they start taking krill oil and discuss it with their healthcare provider.
Pregnancy and Breastfeeding: While omega-3s are vital during pregnancy and lactation, the safety and appropriate dosage of krill oil supplements specifically during these periods are not as extensively studied as fish oil. Pregnant or breastfeeding individuals should consult their doctor.
Children: The safety and appropriate dosage of krill oil for children have not been established as comprehensively as for adults. Pediatric consultation is recommended.

Sustainability Concerns:

While not a direct health danger, the sustainability of krill harvesting is an environmental concern. Overfishing could disrupt the Antarctic ecosystem. Choosing products certified by organizations like the Marine Stewardship Council (MSC) can help mitigate this.

It's crucial to purchase krill oil from reputable brands that test for purity and contaminants, as quality control can vary. Always read product labels and adhere to recommended dosages unless otherwise advised by a healthcare professional.

Krill Oil vs. Fish Oil: Which Is Better for You?

The choice between krill oil and fish oil often comes down to individual priorities, absorption considerations, and specific health goals. Both are excellent sources of omega-3 fatty acids, primarily EPA and DHA, but they differ in their molecular structure, antioxidant content, and cost.

Key Differences

Feature	Krill Oil	Fish Oil
Omega-3 Form	Primarily phospholipid-bound	Primarily triglyceride-bound
Absorption	Some research suggests better absorption due to phospholipid form, especially into brain cells.	Well-absorbed, but some suggest the triglyceride form requires more processing.
Antioxidant Content	Contains Astaxanthin (gives it red color)	Generally low in natural antioxidants; some products add vitamin E.
"Fishy Burps"	Often reported to cause fewer "fishy burps"	Can be a common side effect for some people
Pill Size	Generally smaller capsules	Can be larger capsules, especially high-concentration formulas.
Cost	Typically more expensive per milligram of omega-3.	Generally more affordable.
Sustainability	Antarctic krill populations are monitored, but concerns exist; look for MSC certification.	Sourcing varies widely; look for certifications like MSC or IFOS.
Shellfish Allergy	NOT suitable for individuals with shellfish allergies.	Generally safe for those with shellfish allergies.

The "Better" Question

There's no definitive "better" universally. The "better" option depends on your individual needs:

For potentially enhanced absorption and fewer "fishy burps": Krill oil might be preferred. The phospholipid form is thought to integrate more easily into cell membranes, potentially leading to higher bioavailability.
For antioxidant benefits: Krill oil's natural astaxanthin content offers an additional layer of antioxidant protection that most fish oils lack.
For specific brain health focus: Some studies suggest the phospholipid-bound DHA in krill oil may be more efficiently delivered to the brain.
For cost-effectiveness and high omega-3 dose: Fish oil often provides a higher concentration of EPA and DHA per serving at a lower price point, making it a more economical choice for meeting high omega-3 requirements.
For those with shellfish allergies: Fish oil is the only safe option.
For those who prioritize sustainability and broad options: Both have sustainable options, but the market for sustainably sourced fish oil is generally larger and more diverse.

Ultimately, both krill oil and fish oil deliver the essential omega-3 fatty acids EPA and DHA, which are crucial for health. The choice often comes down to personal tolerance, specific health goals, and budget. For many, a high-quality, sustainably sourced fish oil provides ample benefits. For others, the unique properties of krill oil, such as its phospholipid form and astaxanthin content, justify the higher cost. Consulting with a healthcare professional can help you determine which supplement aligns best with your health profile and needs.

Krill Oil's Nutraceutical Potential in Skin Health and Disease

The skin, as the body's largest organ, is constantly exposed to environmental stressors, including UV radiation, pollution, and pathogens. Maintaining its health and integrity is crucial. Krill oil has emerged as a topic of interest in dermatology and nutraceutical research due to its unique composition, specifically its omega-3 fatty acids (EPA and DHA) and the potent antioxidant astaxanthin.

Mechanisms of Action for Skin Health

Anti-inflammatory Effects: Chronic inflammation can contribute to various skin conditions, including acne, eczema (atopic dermatitis), and psoriasis. The omega-3s in krill oil, particularly EPA, are precursors to anti-inflammatory molecules. By modulating inflammatory pathways, krill oil may help reduce redness, swelling, and irritation associated with these conditions. For instance, in eczema, where the skin barrier is often compromised and inflammation is prevalent, krill oil could theoretically help soothe symptoms and improve barrier function.
Antioxidant Protection: Astaxanthin is a carotenoid responsible for krill's reddish hue and is a powerful antioxidant. It can neutralize free radicals generated by UV radiation and environmental pollutants, which are major contributors to premature skin aging (photoaging), fine lines, wrinkles, and hyperpigmentation. By scavenging these free radicals, astaxanthin helps protect skin cells from oxidative damage, potentially maintaining skin elasticity and firmness.
Skin Barrier Function: Omega-3 fatty acids are integral components of cell membranes, including those in skin cells. They contribute to the lipid matrix of the skin barrier, which is essential for retaining moisture and protecting against external irritants and allergens. A healthy skin barrier is crucial for preventing dryness, sensitivity, and the exacerbation of conditions like eczema. Krill oil may support the integrity and function of this barrier.
Hydration and Moisture Retention: By supporting a healthy skin barrier, krill oil can indirectly contribute to improved skin hydration. When the barrier is intact, transepidermal water loss (TEWL) is reduced, meaning the skin retains moisture more effectively, leading to a smoother, more supple appearance.

Clinical Relevance and Research

While promising, the research specifically on krill oil for skin health is still developing. Many studies on omega-3s and skin health use fish oil or general omega-3 supplements, and the unique properties of krill oil (phospholipid-bound omega-3s, astaxanthin) might offer distinct advantages.

Photoaging: Preliminary studies and anecdotal evidence suggest that astaxanthin, whether from krill oil or other sources, can help protect the skin from UV-induced damage and improve skin characteristics like elasticity and moisture content.
Inflammatory Skin Conditions: While not a primary treatment, krill oil could act as an adjunctive therapy for conditions like eczema or psoriasis by reducing inflammation and supporting skin barrier function. Long-term studies are needed to confirm significant clinical improvements.
General Skin Appearance: Consistent supplementation might contribute to a healthier-looking complexion due to reduced inflammation, improved hydration, and antioxidant protection.

Practical Considerations

For individuals considering krill oil for skin health, it's important to:

Manage Expectations: Krill oil is a supplement, not a miracle cure for skin conditions. It works best as part of a holistic approach including a balanced diet, proper skincare, and sun protection.
Consult a Dermatologist: If you have a specific skin condition, discuss krill oil supplementation with your dermatologist to ensure it's appropriate and won't interact with any prescribed treatments.
Patience: Changes in skin health from nutritional supplements often take time to become apparent, typically several weeks to months of consistent use.

In summary, krill oil's combination of anti-inflammatory omega-3s and antioxidant astaxanthin positions it as a promising nutraceutical for supporting overall skin health, protecting against environmental damage, and potentially alleviating symptoms of certain inflammatory skin conditions. Further dedicated research will continue to elucidate its full potential in this area.

Krill Oil: Dosage and Food Sources

Understanding appropriate dosage and recognizing that krill oil is primarily a supplement, not a common dietary component, is essential for informed use.

Recommended Dosage

There is no single, universally established recommended daily allowance (RDA) for krill oil, as dosages often depend on the specific health goal and the concentration of EPA and DHA in the supplement. However, general guidelines and dosages used in research studies can provide a starting point.

General Health and Maintenance: For overall well-being and to ensure adequate omega-3 intake, a common dosage for krill oil supplements ranges from 500 mg to 1,000 mg per day. This typically provides a sufficient amount of EPA and DHA.
Cardiovascular Health (Triglyceride Reduction): Higher doses might be used under medical supervision for specific conditions. Some studies investigating triglyceride reduction have used dosages ranging from 1,000 mg to 4,000 mg (1 to 4 grams) per day. It's crucial to consult a healthcare professional before taking higher doses, especially if you are on other medications or have underlying health conditions.
Inflammation and Joint Health: Doses similar to those for general health, typically 500 mg to 1,000 mg per day, have been explored for their anti-inflammatory effects.
PMS Symptoms: Some studies have used dosages around 1,000 mg per day to investigate relief from PMS symptoms.

Important Dosage Considerations:

EPA and DHA Content: Always check the supplement label for the actual amounts of EPA and DHA per serving, not just the total krill oil amount. Different brands and formulations will vary.
Individual Needs: Dosage can be influenced by age, weight, diet, and existing health conditions.
Medical Advice: It is always best to consult with a doctor or a registered dietitian before starting any new supplement, especially to determine the appropriate dosage for your specific health needs and to check for potential interactions with medications.
Timing: Krill oil is typically taken with food to enhance absorption and minimize potential gastrointestinal side effects.

Food Sources of Krill Oil

Unlike fish oil, which can be directly obtained by consuming fatty fish, krill oil itself is not a direct food source for humans in the typical diet. Krill are small crustaceans that form a vital part of the marine food web.

Direct Consumption of Krill: While krill are harvested for various purposes (including aquaculture feed and human consumption in some cultures, particularly in East Asia), they are not a common dietary staple in most Western diets. When consumed directly, they would provide omega-3s, but the primary way humans access krill's beneficial compounds is through purified krill oil supplements.
Indirect Sources: The primary "source" of krill oil for human consumption is in concentrated supplement form. These supplements are manufactured by extracting the oil from harvested krill.

Therefore, if you are looking to incorporate the specific benefits associated with krill oil into your diet, a high-quality krill oil supplement is the practical and intended method. For general omega-3 intake from food, fatty fish like salmon, mackerel, sardines, and anchovies are excellent sources of EPA and DHA.

Conclusion

Krill oil, derived from small Antarctic crustaceans, offers a unique profile as an omega-3 fatty acid supplement. Its distinguishing features include omega-3s primarily bound to phospholipids, the presence of the antioxidant astaxanthin, and a lower propensity for "fishy burps" compared to traditional fish oil. Research suggests potential benefits across several health domains, including cardiovascular health, inflammation reduction, brain function, joint comfort, and even skin well-being.

However, choosing krill oil involves practical considerations such as its generally higher cost, the importance of sustainable sourcing to protect marine ecosystems, and the need to avoid it if you have a shellfish allergy. While some studies point to potentially superior absorption due to its phospholipid structure, both krill oil and fish oil effectively deliver essential EPA and DHA. The "better" choice often depends on individual preferences, budget, and specific health goals. As with any supplement, consulting a healthcare professional is advisable to determine appropriate dosage and ensure it aligns with your overall health strategy.