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Once the vitamin B12 reserves reach their normal levels, the injection of vitamin B12 will be needed as maintenance shot once every one to three months to prevent any of the symptoms of deficiency from returning
Route, Dosage, and Frequency Basics The Vitamin B12 injection route is commonly intramuscular or deep subcutaneous, depending on the product label and clinical direction
Subcutaneous: These injections are less common
Typically, people start experiencing benefits 24-72 hours after treatment
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