Dr. Snow's article from the AMA...mentioned that some people in his studies, improved with neurological symptoms, when they were testing "normal"...with more B12.
Rose quoted this paper quite a bit. She was doing her B12 suggestions long before 2003, when the AAFP link was made which suggested a level of 400pg/ml. Some of Dr. Snow's patients were just below 400...and he considered them "normal".
In Japan the levels are much more than 400 today.
Since B12 is not harmful, raising it a bit really can do no harm, compared the symptoms some of his subjects were having.
Here is the link:
http://neurotalk.psychcentral.com/post698522-70.html
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Weezie looking at petunias 8.25.2017
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