Harvard Heart Letter

Omega-3 may not protect the heart

Expert advice in favor of omega-3 supplementation is mixed.

Despite everything you have heard about the benefits of omega-3 fatty acids, taking extra omega-3 might not do any good if you already have heart disease.

It's true that healthy people tend to have high levels of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in their blood. It's also a fact that people with heart failure, stroke, and heart attack often have lower levels of these essential omega-3 fatty acids. However, proof that raising omega-3 levels through supplementation may prevent heart disease or its consequences is lacking.

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