Individuals taking high doses of fish oil are at the similar risk of blood thinning and excessive bleeding as those taking aspirin, according to an article published in the LA Times. Too much fish oil can cause internal bleeding due to an inability to clot blood.
The omega-3 fatty acids present in fish oil are natural anticoagulants that prevent blood platelets from clumping together, according to the Cleveland Clinic. Fish oil also improves blood flow by reducing the levels of bad, or low-density lipoprotein, cholesterol that forms plaque along the artery walls.
Individuals with health conditions predisposed to bleeding are at risk of hemorrhage from any amount fish oil capsules, states physicians in the LA Times. These individuals should first consult with a physician to determine safety before using fish oil.