The effects of the vitamins only work for me sometimes, and I take 100 mg.

When I take my vitamins I have this recurring symptom that I can't stop. It gets really annoying. My bicep twitches uncontrollably, it could be either one. I can't stop it. My friend's mom said it was from lack of Vitamin C. Although I've been drinking it alot to try to get it back to a good level, could it be that B6 is getting in the way? Or the cause of the problem overall?