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A secondary passive diffusion pathway allows approximately 1% of ingested B12 to be absorbed directly across the intestinal mucosa, independent of intrinsic factor
IM injections are delivered into a large muscle group, typically the thigh, gluteal muscle, or upper arm, and are absorbed over a period of minutes to hours
Do you actually need it
A consultation and appropriate blood tests can help identify the underlying cause and determine whether vitamin B12 supplementation is right for you
Contraindications must also be assessed carefully to ensure safety: Known allergies to ingredients (especially sulfa-containing methionine)
They differ in approved indication and dose range
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