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Head-to-head evidence comparison — which supplement is right for you?
Krill Oil vs Omega-3: Omega-3 has the stronger overall evidence (9 vs 6.5/10); they're alternatives for support heart health — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Omega-3 wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Probably helps
10 of 15 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Krill Oil and Omega-3 have evidence — compare verdict strength side-by-side.
1-4g krill oil daily (delivering roughly 0.3-0.9g combined EPA+DHA)
With meals
Krill oil softgels (phospholipid omega-3)
2-3g combined EPA+DHA daily (a typical label dose, not the dose used in the cited trials, which gave 1 g or 3.25 g of omega-3 a day, or 1 to 4 g of fish oil a day without stating its EPA+DHA content)
With meals containing fat
Triglyceride form fish oil
4-12 weeks
3-6 months
Weeks to months
Soon after dosing
4-8 weeks
2-4 weeks
Immediate
4-12 weeks
Krill oil improved osteoarthritic knee pain in adults with mild to moderate knee osteoarthritis: a 6-month multicenter, randomized, double-blind, placebo-controlled trial.
Am J Clin Nutr (2022) · Rct · n=235
235 adults, 6-month double-blind placebo-controlled multicenter RCT
Clinical effectiveness of krill oil supplementation on cardiovascular health in humans: An updated systematic review and meta-analysis of randomized controlled trials.
Diabetes Metab Syndr (2023) · Meta analysis · n=1458
14 RCTs (18 treatment arms), 1,458 participants
Lipid-modifying effects of krill oil in humans: systematic review and meta-analysis of randomized controlled trials.
Nutr Rev (2017) · Meta analysis · n=662
7 RCTs (14 treatment arms), 662 participants
Marine n-3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer
The New England journal of medicine (2019) · Rct · n=25871
During a median follow-up of 5.3 years, a major cardiovascular event occurred in 386 participants in the n-3 group and in 419 in the placebo group (hazard ratio, 0.92; 95% confidence interval [CI], 0.80 to 1.06; P=0.24).
Omega-3 fatty acids for intermittent claudication
The Cochrane database of systematic reviews (2024) · Meta analysis · n=1830
Omega-3 compared with a control may have little to no effect on ankle-brachial index (MD -0.02, 95% CI -0.08 to 0.04; 3 studies, 168 participants; very low-certainty evidence).
A systematic review and meta-analysis of the omega-3 fatty acids effects on brain-derived neurotrophic factor (BDNF)
Nutritional neuroscience (2024) · Meta analysis · n=587
12 RCTs with 587 subjects: omega-3 supplementation increased serum BDNF versus placebo (SMD 0.72, 95% CI 0.28 to 1.15), with high heterogeneity (I2 = 84.39%).
The points are the dose bands of a meta-analysis of 10 randomised trials with 1,426 adults (PMID 37028202): EPA-rich products at 1 to under 2 g of EPA a day reduced depression severity (SMD -0.43), while 2 g a day or more did not (SMD -0.20, not significant), so the 2 g point is plotted as no effect. Doses are grams of EPA, not EPA plus DHA. The Cochrane review of 33 placebo-controlled trials found a small to modest effect, unlikely to be clinically meaningful and rated very low certainty, with no difference in remission or response (PMID 34817851). No trial compared doses directly.
AI-estimated from published studies. Interpret as directional guidance.
Omega-3 has a higher evidence score (9/10 vs 6.5/10) and wins in 2 of 3 categories.
For support heart health, Omega-3 has a higher relevance score (82 vs 48).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
Fish oil vs krill vs algae, EPA vs DHA, the right dose — and the LDL caveat.
The honest tier list — proven staples vs situational vs mostly marketing. The hub the other guides feed into.
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The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.