Your immune system relies on B12 to help produce white blood cells, which are crucial for fighting infections and maintaining overall immune health
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These compounds are not approved for human therapeutic use and should only be studied in appropriate research settings
Intrinsic factor is efficient at absorbing a high percentage of a small dose of B12, but it becomes saturated after a meal containing an above-average amount of B12, and about 4 to 6 hours are required before it can efficiently absorb another dose (Institute of Medicine, 1998)
When to seek medical help See a doctor promptly if you have spreading redness or warmth around the site, discharge or a fever, numbness or weakness that does not settle, or any swelling of the face, lips or throat or difficulty breathing, which can signal a rare allergic reaction and is a medical emergency
(GeneReviews/NCBI, updated descriptions)