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The diagnostic rule: If serum B12 is below 300 pg/mL AND MMA is elevated, B12 deficiency is confirmed
Over a couple of months of steady treatment, people who had tingling or numbness from very low levels may notice gradual improvement
Intramuscular injections typically produce early haematological responses within 34 days, whilst neurological symptoms may begin improving within 12 weeks
replenishment strategies improve metabolic homeostasis [2]
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