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Your GP may arrange periodic blood tests to ensure B12 levels remain adequate, though clinical response is generally more important than specific blood values once treatment is established
Call 999 if you experience symptoms of anaphylaxis such as severe breathing difficulty, facial/throat swelling, or collapse
If your B12 is already normal, an injection is unlikely to change how you feel
Oral Supplements: A Quick Comparison For people with a confirmed deficiency, especially those with absorption problems, injections generally act faster than oral supplements: Injections: bypass the gut, reliably reach the bloodstream, and often produce noticeable changes in energy and mental clarity within days for those who are deficient
In the cases I have taken, most patients will report a rebound in their energy and their brains will become refreshed within the first 1 to 3 days
