Flax seed and other oilseeds contained the highest total phytoestrogen content, followed by
soy bean and tofu. The highest concentrations of Isoflavones are found
in soy bean and soy bean products followed by legumes, whereas lignans are the primary source of phytoestrogen found in nuts and oilseeds (e.g. flax) and also found in cereals, legumes, fruits and vegetables.
Phytoestrogen content varies in different foods, and may vary significantly within the same group of foods (e.g.