sublingual b12 vs b12 injections Oral vs. Intramuscular Vitamin in Vitamin Deficiency • The Blood Project B12 Shots vs. IV Infusions:
Description
This is not one of the harsh preservatives that cause reactions

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Specific Dosage Guidelines Severe Deficiency : For patients with severe vitamin B12 deficiency, an initial dose of 1 mg (1000 g) of intramuscular hydroxocobalamin is commonly administered

US Food and Drug Administration 3
