The current (outdated) range is :
https://www.nlm.nih.gov/medlineplus/...cle/003705.htm
However, good doctors use the lower cut off of 400pg/ml.
B12 passes into the spinal fluid and CSF in the brain passively by osmosis, so that higher blood levels result in more entering the brain. Low spinal values in the CSF of B12 have been found in MS patients and fibromyalgia patients.
It is best to use methyl form of B12 (methylcobalamin) because the MTHFR mutation is quite common, and results in nonconversion of other cobalamins to methyl active form.
Therefore you want a value above 1000. (most labs cannot test higher than 2000pg/ml).
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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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