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But specific situations call for different approaches

Vitamin B12 Injections for Pernicious Anaemia: UK Treatment Guide Pernicious anaemia is an autoimmune condition that prevents the body from absorbing vitamin B12 due to a lack of intrinsic factor, a protein essential for B12 uptake in the gut

Epub 2016 May 24

Who Might Suffer from a B12 Deficiency

[1] [2] Blood levels of B12 may rise quickly following injection, though elevated blood levels do not immediately translate to symptom resolution

A separate 2024 meta-analysis (Alshammari et al.) confirmed the same conclusion, further strengthening the evidence base
