how often to give b12 injections Who Should Take Vitamin And Why? How Often Should I Get
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Fertility and Sterility, 106(7), e251-e256

Your provider will suggest a cadence that matches your needs

Use all medications as directed
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Safety: Insulin pens reduce the likelihood of mishaps and potential complications that can arise with traditional injections

The body will store some B12, but not in excessive amounts, and since it can easily dissolve in water, excess B12 gets excreted in urine