Galactogogue is an acceptable word.
"Galactogogue, special foods, herbs or rituals, that are believed to increase milk supply are used almost
universally"

Incidentally, that site mentioned "colostrum". In all newborn vertebrates, it is important that they get
the first milk the mother secretes. It is loaded with proteins prtotective against common infant infections,
and also has a lot of fat necessary to meet infant's early high caloric requirements.

However, the colostrum of cows if given to humans is not enjoyable, and likely to act as
"defecagogue", off-the-cuff coinage for diarrhea.