vitamin b12 by intramuscular injection rather than orally Efficacy of different routes of supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis B12 Injections vs Pills: Richmond's
B12 Injections vs Pills: Richmond's Complete Guide Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency PMC Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta analysis PMC Oral versus intramuscular administration of vitamin B12 for the treatment of patients with vitamin B12 deficiency: a pragmatic, randomised, multicentre, non inferiority clinical trial undertaken in the primary healthcare setting (Project OB12)
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