[flamesabers]

Will it upset me physically?

It's possible. If you attain estrogen dominance for example, you may experience headaches or back pain. Fortunately, these symptoms and estrogen dominance itself can be remedied.

Will it have the desired mental effects?

Maybe. Some experience a mental change from pm while others don't. Bryony and I both experience 'brain rewiring' from taking pm, while Pansy-Mae doesn't.

Will it cause the growth I hope for?

I think it really depends on what your expectations are.