How B12 works in the body The Harvard Medical School Special Health Report Making Sense of Vitamins and Minerals explains that vitamin B12, like all B vitamins, is water soluble, which means the body expels what it does not use
[3] [4] It is given by injection into a muscle or vein, [2] by pill or sublingually
Allergies to vitamin B12 are extremely rarerarer than common allergies like bee stings, peanut butter, or shellfish
Adjust doses based on testing results and symptoms
Its not routinely tested and even when tested the lower end of the reference range is inadequate for defining deficiency status
The content is not intended to encourage application, diagnosis, or self-treatment of unlicensed individuals, and should not be used as a substitute for the clinical judgment of a qualified healthcare provider