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Kro5.0
Krill Oil Research
Mostly mechanism / observationalHigh safety
5 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most Krill Oil studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality meta-analyses and randomised trials published 2017–2023 with a typical study size of 235 participants.
Based on 5 studies · 2 meta-analyses · 3 RCTs · 2,466 total participants
Confidence
High
By outcome
Joint pain & arthritisTwo RCTs show modest improvements in knee osteoarthritis pain, stiffness, and function over 3-6 months · 3-6 months
Too few graded studies2 studies
Heart & blood pressureMeta-analyses show modest reductions in LDL and triglycerides; no effect on blood pressure or inflammatory markers · 4-12 weeks
Too few graded studies1 study
Safety profile
Too few graded studies1 study
Active research area
4 studies in the last 5 years · Latest meta-analysis: 2023
20172023
1RCTn=235 · medium study2022
In 235 adults with mild-to-moderate knee OA, 4g/day krill oil for 6 months produced modest but significant improvements in knee pain, stiffness, and physical function versus placebo, and raised the Omega-3 Index from 6.0% to 8.9%.
Stonehouse W, Benassi-Evans B, Bednarz J, Vincent AD, Hall S, Hill CL · Am J Clin Nutr (2022)
Pooling 14 RCTs (1,458 participants), krill oil supplementation significantly improved total cholesterol, LDL cholesterol, and triglycerides, but had no effect on blood pressure, glycemic control, body composition, or inflammatory markers.
Huang H, Liao D, He B, Zhou G, Cui Y · Diabetes Metab Syndr (2023)
14 RCTs (18 treatment arms), 1,458 participants
Beneficial effects on total cholesterol (P=0.01), LDL-C (P=0.006), triglycerides (P=0.0005)
No effect on blood pressure, glycemic indices, body composition, or inflammatory markers
Across 7 RCTs (662 participants), krill oil significantly lowered LDL cholesterol (-15.5 mg/dL) and triglycerides (-14.0 mg/dL) and raised HDL (+6.65 mg/dL), while the reduction in total cholesterol was not significant.
Ursoniu S, Sahebkar A, Serban MC, Antal D, Mikhailidis DP, Cicero A, et al. · Nutr Rev (2017)
7 RCTs (14 treatment arms), 662 participants
LDL-C reduced by 15.52 mg/dL (95% CI -28.43 to -2.61)
Triglycerides reduced by 14.03 mg/dL (95% CI -21.38 to -6.67)
In a 12-week RCT of 100 adults with mild knee/hip osteoarthritis, a krill-oil/astaxanthin/hyaluronic-acid complex significantly reduced joint pain (VAS and WOMAC) and improved function versus placebo, with fewer adverse events than placebo.
Hill WS, Dohnalek MH, Ha Y, Kim SJ, Jung JC, Kang SB · Nutrients (2023)
100 participants with mild knee/hip OA, 12-week double-blind placebo-controlled RCT
Greater reduction in pain VAS vs placebo (20.8 vs 10.6 mm, P=0.0105)
WOMAC total score improved vs placebo (-13.0 vs -5.5, P=0.0489)
In a 30-day crossover study of 11 women, krill oil produced significantly greater plasma enrichment of EPA/DHA/DPA-containing phospholipid species than fish oil for 35 of 70 molecular species, mostly ether-phospholipids.
Sung HH, Sinclair AJ, Su XQ · Lipids (2022)
11 healthy women, randomized crossover, 30 days each oil
Krill oil (1.27g n-3 PUFA) vs fish oil (1.44g n-3 PUFA)
35 of 70 omega-3 phospholipid molecular species higher with krill oil