This big study looked at over 25,000 people who already had heart disease. They took a mix of two types of healthy fats found in fish oil. The goal was to see if these supplements could help prevent serious heart problems like heart attacks or strokes.
The main results showed no clear benefit for preventing major heart events. The data did not prove that taking these supplements made a difference in stopping bad heart outcomes for this group of patients.
There was a small sign that fewer people had irregular heartbeats, but this finding was not strong enough to be sure. The study also noted that many patients were already on other strong heart medicines, which might have made it hard to see extra benefits from the supplements.
Doctors should know that these fish oil supplements do not broadly lower the risk of heart attacks or irregular heartbeats for most patients with heart disease.