Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Efficacy of oral compared with intramuscular vitamin B 12 supplementation after Roux en Y gastric bypass: a randomized controlled trial ScienceDirect Is intramuscular (IM) vitamin B12 more effective than oral vitamin B12 supplements, such as 10,000 micrograms (mcg) over the counter (OTC)? The B12 Shot: What Every Human Needs to Know About Injectable Vitamin B12 Oral Treatment Pernicious Anaemia Society
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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