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Depending on your body and the severity of your deficiency, B12 injections can start to work in a matter of hours to a few days
That raises concerns not present with pills, Seevers says, because injectable drugs need to be sterile in order to avoid the risk of including harmful bacteria or viruses
Standard insulin syringes marked in units (100 units = 1 mL) allow accurate measurement of small volumes
Some of the peptide may be broken down before it can exert its full effect on systemic tissues outside the gut
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