New England Journal of Medicine, 2019 · Randomized controlled trial
Daily omega-3 supplements (1 g) did not lower major cardiovascular events or invasive cancer compared with placebo over a median of 5.3 years. Among the secondary outcomes, heart attacks were lower (hazard ratio 0.72), but stroke and cardiovascular death were not.
Always read the original paper for context — effect sizes, study populations and funding sources matter.





