Sural nerve biopsy can leave you with permanent pain. Did you read all the posts on this thread?
Skin punch biopsy is a better alternative.
Even at 379 you are below the acceptable low of 400 today.
People with neurological issues can need more B12 than others.
Please read this:
http://neurotalk.psychcentral.com/post698522-70.html
and
http://www.aafp.org/afp/2003/0301/p979.html
Injections are typically cyano form, which is not active. Some people lack the genetic ability to utilize it and so it does not work well. The active form is methyl and that works much fast and better.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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