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Who should check with a provider first If you are pregnant, nursing, have kidney disease, or take medications that interact with B12 metabolism (such as metformin), discuss this with a provider before starting
While B12 is water-soluble with no established upper safe limit (according to NHS and EFSA guidance), this does not preclude the possibility of adverse reactions, particularly from injectable forms
That single-use window makes sterile water unsuitable for multi-day reconstitution protocols
Testing the organic acid, methylmalonic acid, provides a more accurate level of actual usable B12 in patients
