Krill Oil
Euphausia superba oil
TL;DR
Krill oil delivers EPA and DHA bound to phospholipids rather than triglycerides, which improves incorporation into cell membranes and allows lower doses. It costs considerably more per gram of omega-3, and no outcome trial has shown it beats fish oil clinically.
Ideal For
- People who get fishy reflux from fish oil
- Those wanting omega-3 without needing a fatty meal
- General cardiovascular and joint support at modest doses
Avoid If
- Shellfish allergy
- Needing high-dose EPA and DHA for hypertriglyceridaemia
- Taking warfarin without supervision
- Cost sensitivity — fish oil is far cheaper per gram
Frequently Asked Questions
Is krill oil better than fish oil?
How much do I actually need?
Why does it not repeat on me?
Is it sustainable?
Overview
The krill oil argument is genuinely interesting and routinely overstated. In fish oil, EPA and DHA are attached to a glycerol backbone as triglycerides or ethyl esters; in krill oil they are bound into phospholipids, principally phosphatidylcholine. Because phospholipids are emulsified and absorbed without needing bile-mediated lipase digestion, uptake is less dependent on taking the capsule with a fatty meal, and comparison studies show krill omega-3s incorporating into red blood cell membranes more efficiently per gram delivered. That is a real pharmacokinetic advantage. What has not been shown is that it produces better clinical outcomes. Krill capsules typically contain only 100-200 mg of combined EPA and DHA against 300-600 mg or more in a standard fish oil capsule, so matching a therapeutic omega-3 dose requires many more capsules at substantially higher cost. For triglyceride lowering, where high doses of EPA and DHA are needed, fish oil or a prescription omega-3 is the sensible choice. Krill's genuine advantages are the absence of fishy reflux, the astaxanthin content protecting the oil from oxidation, and the choline load. Sustainability of Antarctic krill harvesting is a legitimate consideration alongside the price.
How It Works
- Phospholipid form absorbs without requiring dietary fat and bile
- More efficient membrane incorporation per gram of EPA and DHA
- Astaxanthin protects the oil from oxidation
- Phosphatidylcholine supplies useful choline
Quick Facts
- Phospholipid form absorbs better per gram than fish oil
- Contains only 100-200 mg EPA+DHA per typical capsule
- No trial has shown better clinical outcomes than fish oil
- Crustacean — unsafe in shellfish allergy
Benefits & Outcomes
Triglyceride Reduction
Krill oil lowers triglycerides but delivers far less EPA and DHA per capsule.
Heart Health Support
Better absorbed, worse value. Sound for general omega-3 status if fish oil causes reflux; the wrong tool if you need therapeutic doses for high triglycerides.
Health Concerns Addressed
Osteoarthritis
Krill oil may slightly improve knee function, but the largest trial found it did not ease osteoarthritis pain.
Lupus (SLE)
Krill oil reliably raises omega-3 levels in lupus, but the one trial found no overall effect on disease activity.
Supporting Research12 studies
Correction of omega-3 fatty acid deficiency and improvement in disease activity in patients with systemic lupus erythematosus treated with krill oil concentrate: a multicentre, randomised, double-blind, placebo-controlled trial
Salmon J, Wallace DJ, Rus V +4 more
KOC corrected omega-3 deficiency in patients with SLE
Krill oil supplementation for knee pain: a systematic review and meta-analysis with trial sequential analysis of randomized controlled trials
Pimentel T, Queiroz I, Florêncio de Mesquita C +4 more
krill oil supplementation did not significantly improve knee pain, stiffness, or lipid profile, although it may help knee physical function
Krill Oil Improves Mild Knee Joint Pain: A Randomized Control Trial
Suzuki Y, Fukushima M, Sakuraba K +2 more
krill oil administration (2 g/day, 30 days) improved the subjective symptoms of knee pain in adults with mild knee pain
Clinical efficacy and mechanisms of krill oil supplementation in knee osteoarthritis: meta-analysis and mechanistic insights
Kou H, Liu H, Lai L +4 more
Krill oil supplementation significantly improved pain and physical function (WOMAC scores at week 4)
Comparative Effectiveness of Nutritional Supplements in the Treatment of Knee Osteoarthritis: A Network Meta-Analysis
Zhang Y, Gui Y, Adams R +4 more
Curcumin, collagen, ginger, and krill oil also demonstrated benefits in some outcomes
A Multicenter, Randomized, Double-Blinded, Placebo-Controlled Clinical Trial to Evaluate the Efficacy and Safety of a Krill Oil, Astaxanthin, and Oral Hyaluronic Acid Complex on Joint Health in People with Mild Osteoarthritis
Hill WS, Dohnalek MH, Ha Y +3 more
combines krill oil, astaxanthin, and lower molecular weight hyaluronic acid to support joint health
Krill oil for knee osteoarthritis: a randomized clinical trial
Laslett LL, Scheepers LEJM, Wluka AE +3 more
Krill oil did not improve knee pain compared with placebo over 24 weeks, with no difference on secondary pain, function or imaging outcomes.
Krill oil for knee osteoarthritis: a meta-analysis of randomized controlled trials
Meng J, Wang X, Li Y +5 more
Pooled effects on knee pain were small and not consistently significant once the largest negative trial was included.
Krill oil improved osteoarthritic knee pain in adults with mild to moderate knee osteoarthritis: a 6-month multicenter, randomized, double-blind, placebo-controlled trial
Stonehouse W, Benassi-Evans B, Bednarz J +3 more
Krill oil reduced knee pain scores modestly compared with placebo, with improvements in stiffness and physical function.
Krill oil supplementation lowers serum triglycerides without increasing low-density lipoprotein cholesterol in adults with borderline high or high triglyceride levels
Berge K, Musa-Veloso K, Harwood M +2 more
Krill oil significantly reduced plasma triglycerides relative to placebo without raising LDL cholesterol, with a dose-related trend.
Comparing the cardiovascular risk-reducing effects of polyunsaturated fatty acids in fish oil and krill oil: a network meta-analysis
Pham TPT, Hoang TV, Le TTD +4 more
Krill oil lowered triglycerides and LDL cholesterol comparably to fish oil, with a possible advantage on LDL, though effect sizes were small.
Comparison of omega-3 polyunsaturated fatty acid bioavailability in fish oil and krill oil: network meta-analyses
Pham TP, Hoang TV, Cao PT +4 more
Krill oil produced comparable or slightly greater omega-3 incorporation per gram of EPA and DHA than fish oil, consistent with phospholipid delivery.
Safety Information
Potential Side Effects
Generally milder than fish oil: occasional loose stools, mild nausea, and much less fishy reflux. Bleeding tendency increases at high doses as with any omega-3.
Contraindications
Avoid with shellfish allergy — krill are crustaceans. Discontinue before surgery in line with standard omega-3 advice.
Drug Interactions
- Warfarin and antiplatelet drugs — additive bleeding risk at higher doses
- Orlistat — reduced absorption of fat-soluble components
- Antihypertensives — mild additive blood pressure reduction
Pregnancy & Breastfeeding
Pregnancy: Likely safe
Breastfeeding: Likely safe
Dosage Guidelines
Dosage Used in Studies
1000-3000 mg
Best Time to Take
Once or twice daily
Best Form
Krill oil with declared EPA, DHA and phospholipid content
Bioavailability
Superior membrane incorporation per gram versus triglyceride and ethyl ester fish oils, with less dependence on dietary fat.
Dosing by Goal
| Goal | Dose | Notes |
|---|---|---|
| Typical range | 1-3 g/day; check the actual EPA and DHA figures rather than total oil | |
| Starting dose | 1 g/day of krill oil | |
| Timing | With a meal | |
| Assessment point | 12 weeks; an omega-3 index test gives an objective answer |
Forms Compared
Standard krill oil
Typically 100-200 mg combined EPA and DHA per 500 mg capsule
Concentrated krill oil
Higher phospholipid and omega-3 content at higher price
Fish oil (comparison)
Three to five times cheaper per gram of EPA and DHA
Food & Timing
Less food-dependent than fish oil, but taking it with a meal still reduces any reflux.
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.