But, just tap literally around teh front of both ears, and see if there is any twitching
in the eye
, nose or mouth area. If there is a problem, it will twitch!!! I was checking on some other deficiency years ago (magnesium I think), and you tap your cheek, just a tap, to see if your lip twitches. Well, mine twitched so bad, I thought, everyone's must. But when I tested everyone else, there mouths didn't move at all, like they all had been numbed.