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If you are supplementing and continue to show signs of deficiency, ask your doctor to test you for a condition known as pernicious anemia
Fast Facts B12 injections can be more effective than pills in certain patients who have trouble absorbing vitamin B12
Key considerations include: your current medication list, any allergies to supplements, and your overall health
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NHS laboratories generally define deficiency as a serum B12 below approximately 148 pmol/L (equivalent to roughly 200 ng/L or pg/mL), though reference ranges vary between laboratories and results should always be interpreted in the context of local ranges and the patient's clinical presentation
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