Efficacy of oral compared with intramuscular vitamin B 12 supplementation after Roux en Y gastric bypass: a randomized controlled trial ScienceDirect Should I give vitamin B12 injection or oral to my 4 year old boy? B12 Injections vs Pills Baltimore: Which Works? Oral Treatment Pernicious Anaemia Society Is intramuscular (IM) vitamin B12 more effective than oral vitamin B12 supplements, such as 10,000 micrograms (mcg) over the counter (OTC)?
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oral vs injectable b12 Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis