Results with PM permanent with little or no maintenence?

I keep reading that PM has to be used continually (at a lower dose) after growth is achieved to maintain the size. Does anyone have any conclusions about this? This is sometimes said about other phytoestrogenic herbs, but I know that many women do retain their growth w/o having to keep taking anything.

I'm currently using Blossom-s soap and no PM internally. I just started. At this time I'm not interested in taking PM internally because I want to try to avoid weight gain in other parts of my body. I have been leaving the suds on my body for at least 20 minutes for max. absorption before rinsing it off. I lather outside the shower for many minutes (basically massaging!). I have no idea if this method is best or not, but it seemed worth experimenting with!