Phytoestrogens are present in almost all plant based foods and drinks. Pair that with xenoestrogens in the water supply, contaminating food, in the air we breathe and in a myriad of personal care products like toothpaste, lotion, and body wash and you'll see that your estrogen receptors are facing a constant onslaught. Bearing that in mind, the phytoestrogens in milk thistle are negligible....and milk thistle is amazing for the liver. I would recommend continuing to take it. That is only my opinion however...