Krill Oil
Also known as: Euphausia superba oil, ω-3 phospholipid oil, krill phospholipid omega-3
Randomized trials and meta-analyses in humans report that krill oil formulations can alter lipid parameters (reductions in triglycerides and LDL-C, and increases in HDL-C in pooled analyses), and some network meta-analyses and smaller trials have suggested benefits for osteoarthritis symptoms; however, at least one large RCT found no benefit for knee pain at 2 g/day over 24 weeks. Adverse event rates reported in these trials were similar to placebo.
Last reviewed: 2026-10-14 · 5 indexed studies
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Overview
Krill oil is an omega-3-rich oil derived from Antarctic krill that supplies EPA and DHA mainly as phospholipids. Human trials and systematic reviews have examined its effects on blood lipids and joint symptoms, with mixed results depending on population and outcome.
Mechanism & Function
Mechanism of Action
Provides EPA and DHA in phospholipid-rich form which can be incorporated into cell membranes and modulate lipid metabolism and inflammatory signalling. The phospholipid delivery form is proposed to affect bioavailability and tissue uptake compared with conventional triglyceride/capsule omega-3s.
Physiological Role
Supplies long-chain omega-3 fatty acids that participate in membrane structure, eicosanoid synthesis and inflammatory regulation.
Primary Pathways
Performance / Health Relevance
May be relevant to metabolic health through triglyceride and lipoprotein lowering. Evidence for symptomatic benefit in osteoarthritis is inconsistent and not supported in at least one large, well-conducted trial.
Evidence Review
Practical Use & Dosage
- Minimum Effective Dose
- Not established from the provided abstracts; human trials have used 2 g/day and 4 g/day formulations.
- Optimal Range
- Not established. Trials cited include 2 g/day (knee osteoarthritis trial) and 4 g/day (ω-3-PL/FFA formulation for severe hypertriglyceridemia).
- Upper / Caution Level
- Not established in the provided abstracts.
- Timing
- Not established in the provided abstracts.
- Best Format
- Phospholipid-containing krill oil formulations have been studied; some trials used ω-3 as phospholipid/free fatty acid (PL/FFA) preparations.
- Bioavailability
- Krill oil supplies EPA/DHA largely as phospholipids, which has been proposed to affect uptake compared with triglyceride-based fish oils; specific comparative bioavailability data are not provided in these abstracts.
- Absorption Considerations
- Not detailed in the provided abstracts.
Safety & Interactions
Side Effects
- •Adverse events reported at similar rates to placebo in included trials (no specific serious signals reported in these abstracts)
Contraindications
- Not established in the provided abstracts
Drug Interactions
- •Not established in the provided abstracts
Who Should Avoid
- •Not established in the provided abstracts
Monitoring
Trials reported adverse event rates similar to placebo; no monitoring guidance is provided in the abstracts.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Krill Oil typically used or indicated?
Krill Oil is most commonly used for: Support for blood lipid management, General omega-3 supplementation, Joint health / osteoarthritis symptom relief (investigational). Supplies long-chain omega-3 fatty acids that participate in membrane structure, eicosanoid synthesis and inflammatory regulation.
How does Krill Oil work?
Provides EPA and DHA in phospholipid-rich form which can be incorporated into cell membranes and modulate lipid metabolism and inflammatory signalling. The phospholipid delivery form is proposed to affect bioavailability and tissue uptake compared with conventional triglyceride/capsule omega-3s.
What is the recommended dose of Krill Oil?
The optimal range is Not established. Trials cited include 2 g/day (knee osteoarthritis trial) and 4 g/day (ω-3-PL/FFA formulation for severe hypertriglyceridemia).. with a minimum effective dose of Not established from the provided abstracts; human trials have used 2 g/day and 4 g/day formulations.. Best taken: Not established in the provided abstracts.. Upper / caution level: Not established in the provided abstracts..
What are the side effects of Krill Oil?
Reported side effects include: Adverse events reported at similar rates to placebo in included trials (no specific serious signals reported in these abstracts). Monitoring: Trials reported adverse event rates similar to placebo; no monitoring guidance is provided in the abstracts.
Does Krill Oil interact with medications?
Known or theoretical interactions: Not established in the provided abstracts. Always check with a clinician before combining with prescription medication.
Who should avoid Krill Oil?
Krill Oil is generally not recommended for: Not established in the provided abstracts; and Not established in the provided abstracts.
How strong is the evidence for Krill Oil?
Evidence level: Moderate (overall score 61/100), based on 5 indexed studies on SuppIndex.
Research & References (5)
Krill Oil for Knee Osteoarthritis: A Randomized Clinical Trial.
Randomized, double-blind, placebo-controlled trial of 2 g/day krill oil versus placebo for 24 weeks in people with clinical knee osteoarthritis and effusion-synovitis.
Effectiveness of a Novel ω-3 Krill Oil Agent in Patients With Severe Hypertriglyceridemia: A Randomized Clinical Trial.
Pooled results of two randomized, double-blind, placebo-controlled trials evaluating a krill-derived ω-3 PL/FFA formulation (CaPre) 4 g/day versus placebo in patients with severe hypertriglyceridemia.
Lipid-modifying effects of krill oil in humans: systematic review and meta-analysis of randomized controlled trials.
Systematic review and meta-analysis (up to March 2016) of randomized trials assessing krill oil effects on plasma lipids.
A Systemic Review on Nutraceutical Supplements used in the Management of Osteoarthritis.
Systematic review discussing nutraceuticals used in osteoarthritis, listing krill oil among agents evaluated preclinically and clinically; provides narrative coverage rather than pooled trial data.
Comparative Effectiveness of Nutritional Supplements in the Treatment of Knee Osteoarthritis: A Network Meta-Analysis.
Network meta-analysis comparing several nutritional supplements for knee osteoarthritis across RCTs (through Dec 2024); krill oil was among the supplements assessed and showed benefits in some outcomes according to the abstract.
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Research Overview
Moderate EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/krill-oil
SuppIndex. (2026). Krill Oil: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/krill-oil
Based on 5 indexed studies · Evidence level: Moderate.
Goal Ratings
Stack Compatibility
Not established in the provided abstracts.