when to have b12 injections Best Vitamin Injection Site: Administering B12 Shots Benefits of Vitamin B12 Injections
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The method you choose affects how well it works

If you have a Vitamin B12 deficiency, the typical frequency for intramuscular doses of B12 is once every 10 days, followed by regular maintenance doses at intervals

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Yes, diphenhydramine (Benadryl) can be taken before injection to reduce reactions
