What is means is that people using cyanocobalamin commercial form will not be able to convert it properly, if they have methylation errors.
The methyl form bypasses any potential errors.
The cobalamin in food I believe has to be methylated too, at least some of it.
more here:
http://en.wikipedia.org/wiki/Vitamin_B12
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Weezie looking at petunias 8.25.2017
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