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B12 from food and supplements has to pass through a fairly involved process in the stomach and gut before your body can use it, and that process becomes less efficient with age, with certain medications, and with diets that include little or no animal protein
This allows multiple withdrawals across weeks of treatment
Because of this preservative system, bacteriostatic water supports safe multi-dose use, allowing researchers to withdraw repeatedly from the same 30mL vial while helping prevent contamination
Therefore, it was stored on the shelf is not enough documentation by itself
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