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Millions of people take fish oil supplements for heart health, but a new report from the American Heart Association shows not everyone may benefit from it.

The report, published in the American Heart Association journal Circulation, found that omega-3 fish oil supplements can help people who have suffered a heart attack or heart failure in the past. But there wasn’t enough evidence to support their use in people without a history of heart trouble.

Forty-four year old Anurag Mehta has been on omega-3 fish oil since suffering a heart attack at a young age.

“I had high cholesterol. And I was 33 so I kind of more of less ignored it. I’d gotten quite sedentary in terms of lifestyle,” he told CBS News.

Mehta credits omega-three fish oil as well as lifestyle changes for keeping him healthy since his heart attack.

“I’ve never stopped,” he said. “For 11 years, I’ve been taking it every day.”

For the study, researchers reviewed the findings of all randomized clinical trials that evaluated a potential role for fish oil supplements to prevent cardiovascular diseases. Those studies assessed the impact of omega-3 fish oil supplements on heart attacks, strokesatrial fibrillation and other health issues.

“Scientific findings from the past two decades that focused on the prevention of cardiovascular diseases continue to show that among people who are at risk of dying from heart disease, the potential benefit of omega-3 fish oil supplements is still useful for people who have had a recent heart attack,” David Siscovick, M.D., M.P.H., chair of the writing committee, said in a statement.

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