About 20% of people 60 and older in the United States take daily fish oil supplements to support heart health.

However, a new study published in the journal BMJ Medicine found regular use of fish oil supplements may increase the risk of first-time stroke and AFib among people in good cardiovascular health.

AFib is an irregular heartbeat that people describe as a flutter or pounding in their chests.

The reason for the risk could be Omega-3 fatty acids in fish oil can affect the electrical rhythms of the heart.

However, the study also found taking fish oil supplements could reduce the risk for people who already have cardiovascular disease.