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Description
The reference intervals may vary between laboratories

Medicover Hospitals

The intranasal forms of methylcobalamin, vitamin B12, should be administered at least 1 hour before or 1 hour after ingestion of hot food or liquids

In terms of other supplements: be cautious with energy drinks or so-called vitamin shots that might also contain high doses of B3 or B6

Pernicious anemia is an autoimmune disorder that prevents the absorption of vitamin B12 due to a lack of intrinsic factora protein produced by the stomach lining
