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To prevent a first heart attack, a lot of people take fish oil. But does it actually help? Not according to a study published in the New England Journal of Medicine.

The 5-year study found patients who took fish oil had better levels of blood fats and good cholesterol. But taking the fish oil didn’t prevent heart attacks. So, for healthy patients – this study says taking fish oil won’t help.

Watch Check Your Oil for all of the details: