Lignans are a diverse group of plant-derived compouds that are the building block for plant cell walls. Lignans are one of two major classifications of phytoestrogens; the other class is isoflavonones. Lignans are a weak form of estrogen that act as an antiestrogen in the body, competing for estrogen receptor sites. Lignans can be found in whole grains, seeds, berries, and vegetables. The richest source of lignans is flaxseed.
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