Flaxseeds are produced by the plant Linum usitatissimum, and contain high levels of fiber and omega-3 fatty acids. The oil produced from flaxseed is sometimes used as an herbal medication to treat several health conditions, although there is not currently conclusive evidence supporting this use. Flaxseed oil is generally safe and well-tolerated, but may sometimes cause side effects, particularly when taken in large doses. As with any health supplement, you should consult your doctor before taking flaxseed oil to treat a health ailment.
Diarrhea
Because flaxseed oil contains large amounts of fiber, it can sometimes cause diarrhea, especially if doses of thirty grams or more per day are taken. When used in smaller doses, particularly for less than three months, flaxseed oil is usually safe for both adults and children, says MedlinePlus.
Constipation
Similar to other fiber supplements, flaxseed oil should be taken with adequate amounts of water. If taken with insufficient water, flaxseed oil can possibly cause or worsen constipation. In rare cases, taking flaxseed oil without adequate water can cause severe intestinal blockage. This risk is increased with patients with scleroderma or systemic sclerosis, states the University of Michigan Health System.
Prostate Cancer
Some controversy surrounds a possible link between flaxseed oil and an increased risk of prostate cancer. Flaxseed oil contains an omega-3 fatty acid called alpha-linolenic acid, abbreviated ALA. Some studies have found an increased risk of prostate cancer associated with ALA, while other studies have not found this effect, explains MedlinePlus. Some evidence suggests that only ALA from meat and dairy increases the risk, while ALA from flaxseed oil is safe. If you are in a high-risk category for prostate cancer, you should consult your doctor before taking flaxseed oil.
Additional Effects
In rare cases, flaxseed oil can cause an allergic reaction, causing symptoms of itching, rash and swelling in the face, lips and throat. If difficulty breathing develops after taking flaxseed oil, call emergency services immediately. The high levels of fiber in flaxseed oil can reduce the digestive tract's ability to absorb certain medications. You should never take flaxseed oil at the same time as other medications.
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