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Metformin and acid-reducing drugs (e.g., omeprazole) can lower B12 absorption over time
What color is the B12
LC-MS can support peptide identity confirmation by comparing mass-related signals with expected compound information
Store reconstituted vials refrigerated at 2 to 8 degrees Celsius
However, functional deficiency can exist at levels up to 350 pg/mL, particularly when methylmalonic acid is also elevated
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