From what I've read, there are pluses and minuses to topical application.
Plus is that the PM enters the blood stream directly without being processed and weakened by the liver. This has a side benefit of reducing stress on the liver.
Minus is that you cannot be sure of how concentrated the topical cream is; it could have a drop of PM to a quart of "cream".
If you do go topical, please let us (ok, me

) know how things work out for you.