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Key highlights US-synthesized
It falls within the J-code category, which CMS maintains for drugs administered other than orally, typically by injection or infusion
At the same time, more recent reviews emphasise that preclinical data predominate, so interpretation of the results should take into account the experimental nature of the substance and the limited number of high-quality clinical data
The following three-test approach, described by Carmel (2008, Annual Review of Nutrition), gives a more complete picture: Serum B12
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