Lignans Save Lives By Mercola Lignans are a type of plant compound known as polyphenols. Lignan precursors are most abundant in flaxseeds, although they’re also found in other seeds (like sesame seeds), berries, fruits, vegetables, and whole grains. When you consume lignan precursors, bacteria in your gut convert the “plant” lignans into “human” lignans, including enterodiol and enterolactone, which have