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Vitamin B12 Injections vs. Supplements: Which is Right for You? Bariatric patients often need to take their Vitamin B12 in a sublingual (under the tongue) form, or injections or nasal spray form, because the surgery alters the stomach's ability to produce the Should You Take Natural vs. Synthetic 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 Irish Journal of Medical Science (1971 ) Efficacy of oral compared with intramuscular vitamin B 12 supplementation after Roux en Y gastric bypass: a randomized controlled trial ScienceDirect Vitamin B12 Shots in Lilburn Main Extension, GA
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