why do i feel tired after a b12 injection Worse My Injection? Understanding Post-Injecti – Oxford Origins Why do I feel worse

For the maintenance treatment of vitamin B12 deficiency, the usual dose is 60-100mcg SC/IM, given once per month

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You should start to notice improvements in symptoms related to Vitamin B12 deficiency within a few days to a week

If you have neurological symptoms (pins and needles, numbness, balance issues), severe fatigue, unexplained weight loss, chest pain, breathlessness, or symptoms that are worsening, you should seek medical assessment promptly.

No adverse metabolic effects observed