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Adham, S., Finzindohou, F

A blood test is an indication for how much the brain might have access to B12, but if for instance the blood-brain barrier does not absorb enough B12, the brain will have too little B12, while the blood test is normal

More and more people ought to check this out and understand this side of your story

[PubMed: 19226266] 70

Aaron Kesselheim, an expert on FDA law and professor at Harvard Medical School and Brigham and Women's Hospital
