normal b12 dose injection Vitamin Injections Dosage and Frequency Best Vitamin B12 Injection Site:

Reference ranges, units, and the absence of a universal upper limit There is no single number that defines a high B12

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Interactions There are no documented risks of drug or supplement interaction with the standard vitamin B12 injections dosage and frequency

That enough B12 in multivitamins is degraded to make a significant difference in B12 status seems implausible because intrinsic factor should bind enough of the remaining active B12 to meet needs, presuming the multivitamin meets our minimum recommendation of 5 g

Also with your dad having Hashimotos you could be more susceptible to thyroid problems