In this meta-analysis of 14 randomized, double-blind, placebo-controlled trials, which involved a total of 20 485 patients with existing cardiovascular disease, supplementation with omega-3 fatty acids did not reduce either the risk of overall cardiovascular events (relative risk, 0.99; 95% CI, 0.89-1.09) or other specified events such as all-cause mortality, sudden cardiac death, myocardial infarction, congestive heart failure, and transient ischemic attack and stroke. There was a small reduction in cardiovascular death (relative risk, 0.91; 95% CI, 0.84-0.99), which disappeared when the authors excluded a study with major methodological problems. This study indicates that there is a lack of sufficient evidence of the secondary preventive effects of omega-3 supplements on cardiovascular disease.