The intent is to get your uterus to squeeze that little bugger out. Soisn't that the effect your are looking for from it? Of course, nothing that we get to balance our hormones is natural, look at insulin. It is either a pork derivative or a chemical compound or something along those line.
As for me, if they ever tell me I should try HRT, I will grow a beard instead.
Of course, you are right, I failed to mention the difference. We would have to give shots to some of the cows back on the farm who just wouldn't let down the milk. about a half a cc of oxy and they would flood the milker. LOL
Babies crying is a wonderful stimulant too. (read with sarcasm!!)
You know, with all the hormones one person can produce and all the variations and how they make people feel or behave, we are one mess of an organism if just one goes out of whack. Even men, I know have those swings. I have especially been mindful of it with our teen boys, it makes them lose their minds temporarily from time to time. My oldest said, I don't even know why I feel this way. So it isn't just the girls, I know that.