Is Omega-3 good for cardiovascular health?

The evidence points that way, though it's not yet conclusive. The cardiovascular evidence for omega-3 supplementation is a useful case study in scientific nuance: a Cochrane review found little to no clear benefit for primary or secondary cardiovascular disease prevention, while a separate, larger meta-analysis of 13 randomized trials covering over 127,000 participants and dose-response analyses found modest but real reductions in cardiovascular events — the two conclusions differ mainly by which trials and doses are emphasized. That's reflected in an evidence score of 55/100 for its role in cardiovascular health, drawn from 9 studies, with an estimated impact on longevity rated moderate (35/100).