The estrogen link with soy has been known for awhile. I did a quick web
search, possibly someone could calculate out how much formula would be
equivalent to a pill.

http://nutritionpantry.com/phyto.htm
=PHYTO-WHAT? Phyto is the Latin word for plants and we are
              familiar with the often-disruptive estrogen hormones.
Isoflavones - a
              primary component of many plants and herbs - is widely
recognized as
              a valued phytoestrogen. Today millions of women are using these
              natural plant estrogens as alternatives to typically
prescribed Premarin
              (mare's urine) and Provera (a synthetic "progestin").

              High blood levels of estrogen can cause P.M.S., growth of
              precancerous cells, endometriosis or breast cancer according to
              Christianne Northrup, M.D. in Women's Bodies, Women's Wisdom.

              Too little estrogen, as in menopause, can result in loss of
bone density
              (osteoporosis), hot flashes, night sweats and heart disease.

              Lower risks of breast cancer in Japanese women are attributed
to two
              important isoflavones - genstein and daidzien. These hormonal
              balancers are abundant in soy. In Dr. Whitaker's Guide to Natural
              Healing, he states that a cup of soy is equivalent to "0.45
milligram of
              conjugated estrogen or one tablet of Premarin." (A 12%
reduction of
              LDL [bad] cholesterol and 10% reduction of serum
triglycerides were
              added benefits of eating soy products.)
or
from http://www.ag.uiuc.edu/~stratsoy/expert/faqs/utilfaq7.html

This was interesting, for my son who has a major reaction to the soy
protein. It explains why he's so sensitive to the soy protein isolate.


                           Estimated Values for Isoflavone Content of
Selected Soyfoods (1)

                   Food  Svg | Svg | Protein  | Genistein | Total | Isoflv
| mg/svg
                                        Size|  Size|  /100gm|  g/100gm|
Isoflav|  mg/gm prot|-
                                         gm |  Meas|     |      |ug/gm
prot|    -|-
       Mature soybeans uncooked
                          93 1/2 cup 37.0 1106 1891 5.1 175.6
                         Roasted Soybeans
                                            86  1/2 cup 35.2 1214 1942  5.5
167.0
                           Soy Flour
                                            21 1/4 cup 37.8 1185  2084 5.5
43.8
                          Textured soy protein, dry
                                            30 1/4 cup 18.0 472  928 5.2 27.8
                         Green soybeans,      uncooked
                                           128 1/2 cup 16.6  301 548  3.3 70.1
                           Soy Milk
                                           228 1 cup 4.4  30 56  2.  20.
                          Tempeh, uncooked
                                           114  4 oz 17 277 531 3.1 60.5
                         Tofu, uncooked
                                           114 4 oz 15.8  209  336 2.1 38.3
                         Soy isolate, dry
                               28 1 oz 92.0 1100  2174   2.2  56.5


                         Soy concentrate, dry
                                            28 1 oz 63.6  111  195  0.3 12.4


                       This information is provided by:
      Karl E. Weingartner, Ph. D.
another site, too lengthy to quote:
http://www.soybean.com/drsuz.htm
All about soy, isoflavones and the estrogen hype.