Efficacy of oral compared with intramuscular vitamin B 12 supplementation after Roux en Y gastric bypass: a randomized controlled trial ScienceDirect B12 Shots & B12 Injections: The Good, Bad and Alternative! Lipotropic Vitamin Injections vs. Oral Supplements Vitamin B 12 Injections Vs Oral Pills: Expert Insights Regenics Blog
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b12 injection vs oral supplement If I am taking oral iron supplementation, should I also receive a vitamin B12 injection?