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Bacteriostatic water is sterile water that contains a small amount of preservative, typically benzyl alcohol
A 10 mg vial at 250 mcg per dose lasts forty doses, which will outlast the 28 day window on most protocols
In UK clinical settings, the recognised standard diluent for injectable medicines is Water for Injections BP (single-use, preservative-free), and the choice of diluent must always follow the licensed product's Summary of Product Characteristics (SmPC)
However, there are also cases when additional factors such as lack of sleep, poor diet, and deficiency of other vitamins like iron, folate, and others, contribute to the issue
If your B12 is already normal, an injection is unlikely to change how you feel
