Can omega-3 cause heart problems?
Sarah Garza
Updated on May 27, 2026
New research finds that taking omega-3 supplements is associated with an increased risk of atrial fibrillation in people with a high risk of, or existing, heart disease. Experts say while omega-3s are essential for health, the relationship between using these supplements and heart health is complicated.
Can omega-3 cause heart palpitations?
Smidt Heart Institute researchers have found that taking high doses of fish oil supplements—specifically one gram or more per day—may increase the risk of developing atrial fibrillation, an abnormal heart rhythm disturbance with potentially serious complications.What are the signs of too much omega-3?
Here are 8 potential side effects that can occur when you consume too much fish oil or omega-3 fatty acids.
- High Blood Sugar. Share on Pinterest. ...
- Bleeding. ...
- Low Blood Pressure. ...
- Diarrhea. ...
- Acid Reflux. ...
- Stroke. ...
- Vitamin A Toxicity. ...
- Insomnia.
Is omega-3 good for the heart?
Omega-3s have anti-oxidant and anti-inflammatory effects and may also improve the function of the endothelial cells that line blood vessels, so intake might have benefit for cardiovascular disease, but this has not been well-established in clinical trials yet. High blood pressure can lead to heart attack and stroke.What are the negative effects of omega-3?
Side effects of omega-3 supplements are usually mild. They include unpleasant taste, bad breath, bad-smelling sweat, headache, and gastrointestinal symptoms such as heartburn, nausea, and diarrhea. Several large studies have linked higher blood levels of long-chain omega-3s with higher risks of prostate cancer.Fish Oil and Heart Disease
Who should not use omega-3?
The AHA does not recommend omega-3 supplements for people who do not have a high CVD risk. To manage high triglyceride levels, the AHA concludes that 4 g/day prescription omega-3s (containing EPA plus DHA or EPA only) lower triglyceride levels when used alone or as adjuncts to other lipid-lowering medications [81].What happens when you take omega-3 every day?
According to the NIH, the FDA have suggested that people should take no more than 3 g per day of DHA and EPA combined. Over long periods, scientists say that omega-3 can reduce immune system function because it lowers the body's inflammatory responses. High doses of omega-3 may also increase bleeding time.Do cardiologists recommend fish oil?
These results prompted the American Heart Association to recommend fish oil supplements to patients with heart disease, and many cardiologists followed suit. It wasn't long before the benefits of fish oil were being touted even for people without heart disease.Are omega-3 supplements safe?
Generally safeOmega-3 fatty acids are essential for good health. Try to get them from your diet by eating fish — broiled or baked, not fried. Fish oil supplements might be helpful if you have high triglycerides or rheumatoid arthritis.
What happens if you take fish oil everyday?
Taking more than 3 grams daily might increase the chance of bleeding. Fish oil side effects include heartburn, loose stools, and nosebleeds. Taking fish oil supplements with meals or freezing them can reduce these issues. Consuming high amounts of fish oil from DIETARY sources is possibly unsafe.Is 1000 mg of fish oil too much?
Many doctors often recommend 1000 to 1200 mg of fish oil, because that amount of fish oil contains the total amount of Omega-3s the doctor wants you to consume.Is omega-3 a blood thinner?
Fish oil is a natural anticoagulant, which means it can prevent the blood from clotting. This property may help explain some of its heart health benefits, since thinning the blood may improve cardiovascular health. Omega-3s may increase bleeding risk when a person takes them with specific anticoagulant or medication.How much omega-3 is needed daily?
Official omega-3 dosage guidelinesOverall, most of these organizations recommend a minimum of 250–500 mg combined EPA and DHA each day for healthy adults ( 2 , 3 , 4 ).