I wouldn't go so far to say that it is a myth but most certainly not fully understood. Llewellyn's research makes a good case concerning progesterone suppression and the prolactin combination.
My ND, who specializes in hormones, seems to believe it is not solely prolactin related but he also won't go as far as recommending me NOT to use a DA either.
I am with Burr and most others- why even mess with an idea when we have DA's at our disposal. I sure as hell am not risking becoming a wet nurse for the neighbors bratty kid anytime soon. On second thought, since I am retired, it might be another income stream available to me. Do you think I could get a special tax exemption for such service?
SEMPER FI