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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
B12 is also added to certain foods, like cereals
What are the benefits of intravenous (IV) vitamin B12 therapy
Intramuscular (into the muscle)
Subcutaneous administration of vitamin B12 is sometimes employed, especially in patients with congenital cobalamin metabolism disorders who require high doses to maintain normal metabolic pathways
Standard B12 Injection Dosage for Adults Vitamin B12 injections have a standard dosage that is key to their effectiveness
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