Fish oil supplements are generally considered safe for American adults. Most people take fish oil supplements for heart-health benefits found in omega-3 fatty acid supplements. Salmon, halibut, tuna and even whale blubber is used to create fish oil supplements. According to a 2009 Consumerlab.com study, fish oil is the second most commonly taken supplement after multivitamins. Still, there are some risks and potentially harmful side effects when taking fish oil. Always discuss taking any supplements with your health care provider.
Bleeding
A natural blood thinner, take fish oil with caution if you suffer from bleeding disorders or your skin bruises easily. You may suffer from increased bloody noses, dark bruises and internal bleeding. Bleeding may occur in the brain, though this side effect is rare. This may cause a hemorraghic stroke to occur and severe complications; even death may result. Be cautious when taking fish oil in combination with anticoagulant drugs or herbs; the drugs include aspirin, warfarin or herparin. Some herbal and dietary supplements, such as willow, red clove and garlic, also may thin the blood. When taking with fish oil, you may decrease your blood's clotting time.
Cholesterol
In most people, fish oil decreases triglycerides, which then reduces cholesterol levels. However, in some people, levels of low-density lipoprotein, or LDL, also referred to as "bad cholesterol," increases. There are no symptoms of high LDL levels. MedlinePlus recommends receiving regular cholesterol blood tests to ensure your LDL levels are within safe perimeters.
Heart Disease
Patients suffering from severe heart failure, extreme heart rhythm irregularities or who have a debrillator in place should take precautions when taking fish oil, according to Harvard Health Publications. In some instances, fish oil actually made these conditions worse, causing a heart attack or severe angina. Talk with your physician prior to taking the supplement.
Fish Burps
Though not a health risk, one of the most common complaints about fish oil supplements is fish breath or belching. According to MayoClinic.com, the socially embarrassing side effect can be reduced by freezing fish oil supplements. Make sure to read the side of the supplement bottle to ensure your type of fish oil can be frozen. The frozen fish oil breaks down slowly in the stomach reducing the occurrence of a fishy aftertaste. Take fish oil supplements at the beginning of meals.
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