Flaxseed is the richest known source of plant lignans, containing 75 to 800 times the levels of other sources such as rye bran and sesame. Lignans help lower the risk of cardiovascular illness and protect against diabetes. According to a 2014 review in the Journal of Oleo Science, the antioxidant properties of polyphenols in flaxseed may trap or block carcinogenic agents. There are 1,528 mg polyphenols in 100 grams of ground flaxseed.

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