Fish and fish oil is recommended for lowering triglycerides, preventing heart disease and heart attacks. Fish oil can also be effective in treating several other health issues including rheumatoid arthritis, attention deficit disorder, osteoporosis and mental disorders, MedlinePlus reports. While fish oil is beneficial, taking high doses can be unsafe, resulting in several side effects. Consult with a physician before beginning a supplement regimen.
Gastrointestinal Symptoms
Gastrointestinal upset, including increased belching, abdominal pain and cramps, bloating and reflux, is common among fish-oil users. You can minimize several of these symptoms by decreasing the dosage and taking the capsules with meals. Taking very high doses of fish oil, however, can result in severe diarrhea. If gastrointestinal upset is a problem, consult your health care provider regarding dosage.
Increased Bleeding
Intakes of greater than 3 g of fish oil per day can result in increased bleeding, according to an article published in the American Heart Association's "Circulation." Fish oil appears to decrease platelet aggregation, which leads to decreased clotting and prolonged bleeding time. Very large intakes have been associated with hemorrhagic stroke, nosebleeds and blood in urine.
Decreased Immunity
MedlinePlus reports a possible decrease in immune-system activity if high doses of fish oil are taken. This results in a reduction in the body's ability to fight infection. This is a concern mainly for individuals who already have a compromised immune system due to disease and medication, as well as the elderly. Consult a health care provider before taking dietary supplements.



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