Intuitively, I think that even a small dose isn't recommended over a long period of time. No way. You don't want your muscle function down there to atrophy because something else is doing it's job. For a short period of time I'm thinking it's okay. (moderation and all that)
But someone else might have more of the scientific facts, hopefully!
I wonder where Ptree is...she's back from Mexico...but probably hard at work today...