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"Is there a "gold standard" for human serum vitamin B12 assay?"
The elements that belong on it are HPLC purity with ultraviolet detection at a wavelength appropriate to the quinolinium chromophore, identity confirmed by nuclear magnetic resonance and by mass spectrometry, an explicit statement of the salt form and counterion, residual solvent content from the synthesis, and water content
The goal is to understand what the body needs to heal more effectively
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