Fish oil benefits are endless and also the diseases that can be cured with this oil is like a black magic but when over consumed due to anxiety or wrong prescription can cause deathly effects. Omega-3 fatty acids contained in fish oil supplements thin blood, especially when consumed at higher doses, such as over 3 grams per day, the level determined by the U.S. Food and Drug Administration to be “generally regarded as safe.” This may be of particular concern to those undergoing surgery. Nosebleeds and blood in the urine have also been associated with high doses. Stomach and intestinal upset, including diarrhea, gas and indigestion, is common with consumption of fish oil supplements, though these effects may be limited by taking fish oil with meals. Many have also experienced a fishy aftertaste. Lowered blood sugar levels have been noted occasionally and lowered blood pressure may be a negative effect for some. Fish oil supplements should also be avoided by those with allergies or sensitivities to fish.