subcutaneous b12 injections How to self-inject intramuscular vitamin - Overview Best Vitamin B12 Injection Sites:

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Its a big fat no from me

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According to a study published in Frontiers in Pharmacology, intramuscular administration of vitamin B12 produces a faster increase in serum levels compared to oral routes, although both methods are effective in restoring normal cobalamin levels in patients with deficiency

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[3] [6] If no reversible cause is found, or when found it cannot be eliminated, lifelong vitamin B 12 administration is usually recommended