It works, too! @doritos posted that a few weeks ago. When I got sick, I put that on my feet 2x a day. Damned if it didn't cut my cold my in half!
I talked to the ped about it, too, and he never heard of it. He said I could put it on the baby's feet if she gets sick.
In regards to you, Sarah, I don't know. It uses the same ingredients as muscle rub and it all pretty much depends on your doc. I've heard yes and no for usage.