[Dynsei]

With your post, it clicked, that perhaps what if prolactins can also used for expressing milk. Hops acts like progesterone and estrogen, and it increases prolactin. Also, hops affects the cycle, (probably increasing the luteal phase?). I'll reexamine chasteberry's effects.

http://www.fugh-berman.com/files/Bust.pdf says diosgenin (contained in fenugreek and wild yam) increase "terminal end bud differentiation " interpreted as maturation.