Flax oil, which is more commonly referred to as flaxseed oil or linseed oil, is extracted from the seeds of the Linum usitatissimum plant. Supplements containing flax oil are commonly used to treat a variety of health conditions, including arthritis and heart disease, although the evidence supporting these uses is not conclusive, according to MedlinePlus. While flax oil is generally safe, it may cause side effects, especially diarrhea, when taken in large amounts. As with other health supplements, you should consult your doctor before taking flax oil.
Diarrhea
One of the most commonly reported side effects of flax oil is loose stools, which can progress to diarrhea in some cases. The risk of diarrhea is significantly increased by taking large doses of 30 g or more per day, reports MedlinePlus. Dividing large doses into smaller doses and taking those throughout the day may decrease the risk of this side effect.
Allergic Reactions
Certain individuals may experience allergic reactions after taking flaxseed oil. The early signs and symptoms of an allergic reaction often include itchy skin, hives, rashes, congestion and red, watery eyes. In rare cases, a severe reaction may develop, causing nausea and vomiting, dizziness, swelling of the face and throat, weakness, wheezing and difficulty breathing. If you experience symptoms of a severe allergic reaction and have difficulty breathing, you should contact emergency medical services immediately.
Excess Bleeding
The omega-3 fatty acids found in flax oil can reduce the ability of blood to clot, which can increase the risk of excess bleeding. If flax oil is taken at the same time as other blood-thinning medications, including aspirin, clopidogrel and warfarin, the risk of severe bleeding may be increased, warns the University of Maryland Medical Center. You should stop taking flax oil at least two weeks before undergoing surgery or dental procedures.
Prostate Cancer
Flax oil contains a specific type of omega-3 fatty acid known as alpha-linolenic acid, or ALA, which has been tentatively linked to an increased risk of prostate cancer, MedlinePlus states. However, ALA from plants, such as the ALA found in flax oil, does not appear to carry this risk. Researchers are still in the process of determining the exact relationship between ALA and prostate cancer. If you have a family history of prostate cancer or are in a high-risk group for prostate cancer, you may want to consult with your doctor before taking flax oil.
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