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Can I start intramuscular vitamin B12 therapy and later switch to oral supplementation? Best Vitamin B12 Injection Site: Administering B12 Shots Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency PMC Vitamin B12 Injection Dosage for Adults: Guidelines Frontiers Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta analysis Efficacy of oral compared with intramuscular vitamin B 12 supplementation after Roux en Y gastric bypass: a randomized controlled trial ScienceDirect
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