This is in no way my field of expertise, but I do remember reading some fascinating studies very recently. I've tried to find the links again, without any success, but perhaps someone else will...
As there would appear to be more and more children with lactose intolerance, and more and more health conscious parents, so now more and more kids are being given soy milk as a substitute for cow's milk.
The interesting thing is that the isoflavones in soy milk seem to contain phyto estrogens, and girls raised on soy milk would appear to have their bodies reach puberty 18 months to two years prior to kids raised on cow's milk.
BUT this is still unproven!!!
My only thought is that if indeed it is confirmed that soy is a phyto estrogen, then obviously it would be having an effect on hair growth, as do so many other phyto hormones. Any androgen suppressant (aldactone, androcur, etc...)will reduce hair growth.
Having said that, I can believe that whereas someone consuming a product (soy milk) for a dozen years will be affected by it, I cannot believe that a few applications of soy milk on the body could have any real impact on hair growth (but I will try it!).
If that were the case, estrogel would work better than Vaniqa, and a mixture of androcur and olive oil could be the snake oil of the 21st century!. (DO NOT TRY THIS!)
Sorry for the ramble. Andrea, please correct any obvious errors...