Apparently someone posted a request some time ago for more information on
Goat's Rue as a galactatgogue, but very little was forthcoming.  I've been
looking for information too but happened across "Encyclopedia of Medicinal
Herbs" by Joseph Kadans, ND, PhD that I have from 1981.  It has  very little:

Effects and Reported uses:  A dosage of from five to twenty grains of the
powdered herb has been found valuable for promoting the flow of milk of the
nursing mother.  It is also recognized as a diuretic, increasing kidney
activity and the flow of urine, and is a vermifuge, destroying worms in the
intestinal tract.
Botantical name:  Galega officinalis

What is a dosage of 5-20 grains?  Any idea how that translates into a
tincture?  A friend got some from Wish Garden Herbs locally but they were
unwilling to give her more information.  Would a tea be ok, and how strong?
I've heard it's a very powerful herb but I'm wondering about the diuretic
while nursing.

Kate

Because whole cow's milk contains inadequate concentrations of certain
important ingredients, including iron, the Academy recommends that infants
be fed breastmilk during the first 12 months of life. The only
acceptable alternative to breastmilk is iron-fortified infant formula. Since
the Academy believes that direct advertising of infant formula to mothers
will inevitably decrease the incidence of breast-feeding, and thereby impair
the health of infants in the U.S., the Academy has for many years
recommended that infant formula companies refrain from advertising their
products to the general public.   -
http://www.aap.org/about/where_we_stand.html

http://www.cs.colorado.edu/~kolina/Home.html