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High-dose vitamin B12 supplements taken concurrently with the injection may lead to excessive B12 levels, though toxicity from vitamin B12 excess is extremely rare due to its water-soluble nature and efficient renal excretion

Some experts recommend taking B12 supplements on their own because they can bind with or interact with other ingredients, so its a good idea to chat with a healthcare pro before making this call

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[DOI] [PubMed] [Google Scholar] 18.Eussen S.J., de Groot L.C., Clarke R., Schneede J., Ueland P.M., Hoefnagels W.H., van Staveren W.A