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Its possible (and highly likely) that you may have NORMAL B12 levels but still have a functional deficiency of vitamin B12 in your body
There is no risk of dangerous overdose from typical multivitamins alongside the shot, but any more than that (like multiple high-dose supplements) should be avoided
McGuff.com
Niacin (Vitamin B3)
Other factors that can cause vitamin B12 deficiency include gastrointestinal disorders, ageing, and certain medications like metformin and proton-pump inhibitors
R., & Gupta, V
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