I know every geek here research the hell out of everything... and so i don't trust even my doctor when he/she can't show (or i can't find later) pertinent and well controlled studies before messing something in my body. i'm pretty sure you did your research, but those articles and discussion here shouldn't be taken as 'proof' of anything as the comment i replied to sounded to imply.

also, i have a paranoia that no hormone/protein/enzyme does less then a few things in your body. if they list only one or two effects, it's because they have no clue what else they do.

prolactin was believed to only affect the milk production in mamals for a long time (and water-salt control in fishes). now there's some other dozen effects on the body including neuron fiber formation.