Diet and NutritionBy popular demand our nutritional message board. This board will be monitored by a Registered RD who is certified in oncology by the American Dietetic Association
Soy contains Genistein which is a weak estrogen. Genistein seems to be somewhat preventative of breast cancer because it occupies the estrogen receptor and prevents the stronger estrogen (estradiol) from linking onto the Estrogen receptor. Once you actually have breast cancer the effect of Genistein is not well known. In rats it seems to fuel ER positive breast cancers. Call the supplement factory and see how much soy is in each tablet and how much Genistein. The amount may be very small. Of course to put your minds more at ease it might be easier to avoid the soy made products altogether.