b12 injection covid vaccine and vitamin Compounded Cyanocobalamin (Vitamin B12) Injection FDA approves Pfizer-BioNTech's Omicron XBB.1.5-adapted

Since B vitamins are water-soluble and must be replenished daily, taking one B vitamin in very high amounts for a long period may affect the balance of the others

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If your goal is convenience at the expense of dosing precision, oral administration might suffice, but it abandons the pharmacokinetic foundation that makes the research findings meaningful in the first place

These side effects usually disappear within a day or two

Hydroxocobalamin may also be given intravenously in certain scenarios (for example, 5 g IV for acute cyanide poisoning antidote therapy), but such high-dose use is in emergency settings and distinct from routine deficiency treatment