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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
Pregnant or Breastfeeding Women: B12 is essential for the baby's and mother's health
Severe allergic reactions, such as itching or difficulty breathing, are rare but possible
The standard NHS regimen for treating deficiency involves loading doses followed by maintenance therapy, with frequency determined by the underlying cause and severity of deficiency
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Incidentally, the healthy reference range is 191-663 pg/ml and correlates closely with oral cobalamin intake, which is why the vitamin B12 blood level alone is not an adequate parameter to diagnose a deficiency (Herrmann and Obeid, 2014)
