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Description
Vitamin B12 shots work faster than any oral supplement

British Journal of haematology

PMID 18709880

He diagnosed her with PA (she has coeliac disease so it was clear to him why she wouldnt absorb B12 orally) and a severe iron deficiency

(PubMed) Franke B, Vermeulen SH, Steegers-Theunissen RP, et al
