[Pansy-Mae]

Breast are largely composed of fat, with an underlying core of milk glands and ducts and connective tissue to support it all. As a genetic male your body does not produce significant quantities of estrogens, ( not enough to grow breasts, at least) but it does produce androgens which are "anti-breast" for want of a better expression. So when you stop taking phyto-estrogens,i.e. PM or any other appropriate herb/supplement, although any tissue growth is permanent, the fat will very rapidly ( noticeably within a couple of weeks) return to a male distribution pattern and your boobs will go flat. That's why a maintenance dose is necessary, to prevent that from happening.