Krill Oil: Science-Based Guide 2026

Krill Oil: What It Is and How It Differs from Fish Oil

Krill oil comes from Antarctic krill (Euphausia superba) — tiny shrimp-like crustaceans living in the Southern Ocean. Unlike fish oil, where omega-3 fatty acids (EPA and DHA) exist in triglyceride form, krill oil delivers them primarily as phospholipids. This chemical difference affects how the body absorbs and uses these fatty acids.

This guide explains what the science actually shows, when krill oil is a justified choice, and when standard fish oil is the smarter option.

Who Is Krill Oil For and What to Expect?

Krill oil is best suited for people who:

Cannot tolerate fishy aftertaste from fish oil (krill oil causes almost no fish burps)
Want astaxanthin and omega-3 combined in one capsule
Prefer an MSC-certified sustainable omega-3 source
Are willing to pay a premium for convenience and added compounds

Expected outcome: Regular omega-3 intake (at least 250–500 mg EPA+DHA daily) supports normal cardiac function (EFSA-approved claim). Lowering triglycerides requires 2–4 g EPA+DHA per day.

TL;DR — Key Takeaways

Krill oil contains omega-3 as phospholipids + astaxanthin + choline
Schuchardt et al. (2011) showed higher plasma EPA with krill oil vs fish oil at equal EPA+DHA doses
Krill oil costs ~€25–45/month vs fish oil ~€10–20/month for equivalent EPA+DHA
For most people, fish oil offers better value; krill oil has niche advantages
Choose krill if you cannot tolerate fish oil burps or want astaxanthin included

Context: Why Omega-3 Matters

EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are long-chain omega-3 fatty acids the body cannot produce in adequate quantities. They are linked to cardiovascular health, inflammation regulation, and brain function.

The European Food Safety Authority (EFSA) has confirmed that EPA and DHA support normal cardiac function (250 mg/day) and that they lower triglycerides (2–4 g/day). Studies suggest most Europeans, including Estonians, fall short of recommended omega-3 intake — especially those not eating oily fish regularly.

How Krill Oil Works

Phospholipids vs Triglycerides

Fish oil omega-3 comes mainly in triglyceride form — it must be hydrolysed before absorption. Krill oil omega-3 is bound to phospholipids (mainly phosphatidylcholine), structurally similar to cell membranes. Schuchardt et al. (2011) compared 543 mg EPA+DHA from krill oil vs 864 mg EPA+DHA from fish oil — the krill group achieved higher plasma EPA, suggesting more efficient absorption per mg consumed.

Ulven et al. (2011) confirmed similar findings with Neptune Krill Oil: phospholipid-bound EPA is incorporated more effectively than triglyceride-bound EPA from fish oil.

Astaxanthin

Krill oil contains naturally occurring astaxanthin (~0.1–0.3 mg per capsule) — a carotenoid antioxidant that prevents the omega-3 from oxidising inside the capsule. Fish oil without antioxidants degrades more readily. Astaxanthin also has independently studied effects on inflammation markers (Guerin et al., 2003), though the amount present in a krill oil capsule is small.

Choline

Krill oil contains choline bound to phospholipids. Choline is an essential nutrient for liver function, neurotransmitter synthesis (acetylcholine), and foetal brain development. Many Europeans, including Estonians, fall below recommended choline intake.

Step-by-Step: How to Use Krill Oil

1. Start with 1–2 capsules per day (typically 500–1000 mg krill oil, providing 100–250 mg EPA+DHA)
2. Take with a fatty meal — fat-soluble compounds absorb better with dietary fat
3. Reassess after 8–12 weeks — blood omega-3 index stabilises over about 3 months
4. Refrigerate after opening — astaxanthin slows oxidation, but cooling is still recommended
5. Combine with dietary healthy fats (oily fish, nuts, olive oil) for optimal omega-3 status

Products and Applications

Krill oil products are available at MaxFit.ee. Capsules typically contain 500 mg krill oil, providing ~100–150 mg EPA+DHA per serving.

If the goal is lowering triglycerides, you need ~2–4 g EPA+DHA daily — this would require 10–20+ krill oil capsules, making concentrated fish oil a more cost-effective option for therapeutic dosing.

Comparison: Krill Oil vs Fish Oil

Property	Krill Oil	Fish Oil
EPA+DHA form	Phospholipids	Triglycerides
Absorption	Better per equal dose	Good, especially concentrated forms
Astaxanthin	Yes (natural)	Usually no
Choline	Yes	No
Fishy aftertaste	Almost none	Possible
Cost (€/month)	~25–45	~10–20
Cost per 1 g EPA+DHA	Higher	Lower
Sustainability	MSC-certified	Varies

Bottom line: Fish oil is more cost-effective for most people seeking omega-3. Krill oil is justified in specific situations.

Common Mistakes and Fixes

Mistake 1: Dose too small
One krill oil capsule per day provides only ~100–150 mg EPA+DHA. Cardiovascular benefits require 250–500 mg daily.
Fix: Take 2–3 capsules daily or choose a concentrated product.

Mistake 2: Oxidised product
Rancid omega-3 is not beneficial and may be harmful.
Fix: Check the expiry date, refrigerate after opening, smell test — a rancid smell is a warning sign.

Mistake 3: Expecting quick results
Omega-3 effects are cumulative and long-term.
Fix: Plan at least 3 months of consistent use before assessing results.

Mistake 4: People with shellfish allergies ignoring the risk
Krill oil is a crustacean product — people with shrimp allergy may react.
Fix: If you have shellfish allergy, consult your doctor before taking krill oil.

Frequently Asked Questions

Is krill oil safe during pregnancy?

Krill oil provides EPA and DHA important for foetal brain development. Consult your doctor before use during pregnancy.

Is krill oil suitable for vegans?

No, krill oil is animal-derived. Vegans can get EPA and DHA from algal oil (Schizochytrium sp.).

Does krill oil interact with blood thinners?

In high doses, omega-3 fatty acids can affect blood clotting. If you take warfarin or other anticoagulants, consult your doctor.

Why doesn't krill oil cause fish burps?

The phospholipid form absorbs faster and capsules are smaller — aftertaste rarely occurs.

How much EPA+DHA is in one krill oil capsule?

Check the product label. A typical 500 mg krill oil capsule contains 90–150 mg EPA+DHA.

Local Angle — Krill Oil in Estonia

In Estonia, krill oil is available through MaxFit.ee starting from approximately €25–40 per month (60–90 capsules). Fish oil provides equivalent EPA+DHA at €10–20 per month.

Estonian omega-3 intake is below recommended levels according to dietary surveys, particularly for those not eating oily fish at least twice weekly. During autumn and winter, omega-3 supplementation becomes especially relevant.

References

1. Schuchardt JP, Schneider I, Meyer H, et al. (2011). Incorporation of EPA and DHA into plasma phospholipids in response to different omega-3 fatty acid formulations — a comparative bioavailability study of fish oil vs. krill oil. Lipids in Health and Disease, 10, 145.
2. Ulven SM, Kirkhus B, Lamglait A, et al. (2011). 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, 46(1), 37–46.
3. Guerin M, Huntley ME, Olaizola M. (2003). Haematococcus astaxanthin: applications for human health and nutrition. Trends in Biotechnology, 21(5), 210–216.
4. Calder PC. (2015). Marine omega-3 fatty acids and inflammatory processes: effects, mechanisms and clinical relevance. Biochimica et Biophysica Acta, 1851(4), 469–484.
5. EFSA Panel on Dietetic Products, Nutrition and Allergies. (2010). Scientific Opinion on the substantiation of health claims related to EPA, DHA and maintenance of normal cardiac function. EFSA Journal, 8(10), 1796.

Summary and Action Plan

Krill oil is a scientifically interesting product. But for most people, fish oil offers better value per gram of EPA+DHA.

Choose krill oil if:

You cannot tolerate fish oil aftertaste
You want astaxanthin and omega-3 in one product
Sustainability certification matters to you

Stick with fish oil if:

Your primary goal is cost-effective omega-3 intake
You need large EPA+DHA doses (for triglyceride lowering)

See also: