During the same week the United States Preventive Services Task Force (USPSTF) said it would not recommend that taking vitamins and supplements can prevent heart disease and cancer, a new study has come out saying one of the most popular supplements out there may be dangerous to a subset of those who are prescribed it. The supplement—Omega-3 fatty acids—is the third most popular in America, according to one recent ConsumerLab survey, with 52% of respondents saying they have taken it in the past year (it was beaten only by magnesium and Vitamin D). Read on to see if