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Sealed formulation can be expired within 18-36 months of production while once it gets opened
(4) If the exact value would change management, the clinician may need to ask whether dilution or another confirmatory step is available, since "greater than 1,000 ng/L" can hide a B12 level that is markedly elevated
These products are not drugs, foods, cosmetics, or dietary supplements
An in-house COA from "XYZ Labs Internal QC" is not independent verification
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