After reading averything I can find on Bell's Palsy, I have decided that it is very difficult to determine what actually helps. Fortunately most people get better in a few weeks regardless of what they do or don't do. The number of scientifically valid double blind studies is very limited. In the absence of these, you are left with adecdotal evidence.
People try all sorts of things and get better.
They attribute their recovery to whatever they tried but have no way of knowing if they would have equally good results, or even better results, if they had done something else or nothing at all. I concluded that it is worth trying the less intrusive things like ensuring you are getting adequate vitamins by taking a standard vitamin suplement, doing gentle massage, and the like. These things are unlikely to do any harm and they might even help. You might include acupuncture and chiropractic in the same catagory. Hopefully if done properly, they won't cause any problems.