Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Low B12 level will affect normal nerve functioning resulting in twitchings.
You should take at least 1000 mg B12 sublingual tablet daily for better absorption.
B12 injections are recommended if you are not absorbing well --symptoms will not improve in that case with oral supplementation. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/
Yes low B12 will cause hand and feet tingling commonly.
You should see gradual improvement over time.