Posted 1/7/2015 4:09 PM (GMT 0)
If your vitamin B12 levels are normal, vit b12 supplements will not likely help, especially not in twitching.
Twitching can be caused by low or high calcium levels, but I suppose this was excluded by tests...?
Twitching can be caused by stress, exercise, lack of sleep, caffeine, certain drugs...
http://www.nlm.nih.gov/medlineplus/ency/article/003296.htm