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A 2019 meta-analysis of 13 RCTs (n=127,477) found that marine omega-3 supplementation reduced the risk of major cardiovascular events by 8% (RR 0.92, 95% CI: 0.87-0.98). Higher-dose EPA regimens (>1g/day) showed stronger reductions of up to 17% in cardiac mortality.
| Study | Participants | Finding | Quality |
|---|---|---|---|
Association Between Omega-3 Fatty Acid Supplementation and Risk of Major Cardiovascular Disease Events: A Systematic Review and Meta-analysis Hu Y, Hu FB, Manson JE — JAMA Cardiology (2019) | 127,477 | Marine omega-3 supplementation was associated with significantly reduced risk of MI, CHD death, total CHD, CVD death, and total CVD | High |
For cardiovascular risk reduction, 1-2g/day of combined EPA+DHA from marine sources is well-supported. Those with elevated triglycerides may benefit from 2-4g/day under medical supervision. EPA-dominant formulations appear to have stronger cardiovascular benefits than DHA-dominant ones.
A large-scale meta-analysis examining the effects of marine omega-3 (EPA/DHA) supplementation on major adverse cardiovascular events, triglycerides, and blood pressure across 13 randomized controlled trials involving 127,477 participants.
Yes. A 2019 meta-analysis of 13 RCTs with 127,477 participants found that marine omega-3 supplementation reduced the risk of major cardiovascular events by 8%. The benefit was dose-dependent, with higher EPA intakes showing greater protection.
For general cardiovascular protection, 1-2g/day of combined EPA+DHA is supported by clinical evidence. For high triglycerides, 2-4g/day may be appropriate under medical guidance. EPA-dominant formulations appear more effective than DHA-dominant ones for cardiovascular outcomes.
Research suggests EPA may have stronger cardiovascular benefits. The REDUCE-IT trial showed that high-dose EPA (4g/day icosapent ethyl) reduced cardiovascular events by 25%. EPA appears to have unique anti-inflammatory properties beyond triglyceride lowering that DHA does not fully share.
Modestly, yes. Meta-analyses show omega-3 supplementation at 3g+/day can reduce systolic blood pressure by 2-3 mmHg in people with hypertension. While this is a small effect, even modest BP reductions at a population level significantly reduce cardiovascular risk.