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Standard B12 Injection Dosage for Adults Vitamin B12 injections have a standard dosage that is key to their effectiveness
Give the injection slowly and evenly
Typically, you can start to feel the positive effects of the IM shot, between 24 - 72 hours post injection, dependent of current levels of B12 in the body
Early treatment can help a lot and prevent serious problems
Do You Need a Prescription for B12 Injections
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