I think the language in foreign papers can be poorly chosen. ( I have seen poorly worded Russian papers, for example).
What that paper is saying is that the active transporter in the CSF will not work if the blood levels of the nutrients are poor.
It does not necessarily mean that ADEQUATE blood levels won't work. I think that the word "high" is being misused. I think they meant adequate. Just my opinion.
There are many nutrients in CSF..B12, and others:
like this:
http://www.jacn.org/cgi/content/abstract/23/3/233
Having a CSF leak over a long period of time, has to be very hard on the patient, for many reasons!
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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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