 You might have a brain bleed. So please, please don't take omega-3 fatty acids. I recently talked to a patient who's on a blood thinner, and she spoke to her cardiologist, and the cardiologist yelled at her and said, no, you can't take omega-3 fatty acids. Well, here's reassuring news for users of omega-3s. Headline, meta-analysis finds no increase in bleeding risk from omega-3s.