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One study found that high doses of oral B12 (1,000 mcg daily) could provide adequate absorption even in the presence of intrinsic factor deficiency
Find the best time to take B12 supplements here
In B12 Shots & B12 Injections: The Good, Bad, and Alternative! explore the critical considerations for emergency medical situations related to B12 injections
The British Society for Haematology emphasises that treatment should not be delayed whilst awaiting confirmatory test results if clinical suspicion of B12 deficiency is high, particularly when neurological symptoms are present
Natural sources rich in B12 tend to be derived from animal foods, so anyone following a vegan or vegetarian diet may need to supplement
