(n-3) fatty acids and cardiovascular health: are effects of EPA and DHA shared or complementary?

Should omega-3s come as EPA, DHA, or both? This review takes the two principal fish-oil fatty acids apart to ask whether their cardiovascular benefits are shared or complementary.

The answer is some of each. EPA and DHA overlap on many fronts — lowering triglycerides, easing inflammation — but the authors find distinct fingerprints too: DHA appears to have particular effects on heart rhythm and on LDL particle size, while EPA is more associated with reductions in nonfatal coronary events. The implication is synergy: the two aren’t interchangeable, and getting both covers more ground.

The practical takeaway, per the authors, is to favor combined EPA+DHA intake — through fish or fish oil — rather than betting on a single component. (Worth noting this sits in productive tension with later evidence, such as Khan et al. 2021, suggesting purified EPA may outperform blends for hard outcomes — a debate still live.)

We rate the evidence moderate: a thorough 93-reference review from respected experts, though the lead author discloses nutrition-industry funding and it offers no new data. Its clinical significance is moderate and practical — actionable dietary guidance affecting millions — even as the EPA-versus-combined question continues to evolve.