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Talk with your doctor or a registered dietitian about whether or not you should supplement with B12 and how much you should take.
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If you are unsure, call and ask before you inject
5mg vial concentration reference 5mg vial dosing chart (units to draw on U-100 insulin syringe) Recommendation for 5mg vials: Use 1.0mL of bacteriostatic water
There are a few other groups that need to take more vitamin B12, usually as a supplement, to avoid deficiency
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