Study finds regular use of fish oil supplements may increase, not reduce, the risk of first-time stroke and atrial fibrillation among people in good cardiovascular health https://www.yahoo.com/news/fish-oil-supplements-may-cause-093028396.html For people without heart issues, regular use of fish oil supplements was associated with a 13% higher risk of developing atrial fibrillation and a 5% heightened risk of having a stroke https://bmjmedicine.bmj.com/content/3/1/e000451