Side Effects and Cautions

• Flaxseed and flaxseed oil supplements seem to be well tolerated. Few side effects have been reported.
• Flaxseed, like any supplemental fiber source, should be taken with plenty of water; otherwise, it could worsen constipation or, in rare cases, even cause intestinal blockage.
• The fiber in flaxseed may lower the body's ability to absorb medications that are taken by mouth. Flaxseed should not be taken at the same time as any conventional oral medications or other dietary supplements.
• Tell your health care providers about any herb or dietary supplement.  You are using, including flaxseed or flaxseed oil. This helps to ensure safe and coordinated care.