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Isoflavones are a class of phytoestrogen compounds well studied for their benefits to human health, which include prevention of cardiovascular disease and some cancers.

Flax is a risk source of high-quality protein and potassium and contains lignans, which are phytoestrogen and antioxidants.

Soy has a controversial reputation, since it contains phytoestrogen plant compounds that may or may not like the hormone estrogen, which is linked to breast cancer.

Even in that short time, the study found, about 20 percent of the women using soy developed high blood concentrations of genistein, a soy phytoestrogen.

Despite concerns about its phytoestrogen content, eating soy has not been shown to promote breast cancer.