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PDF) Comparison of sublingual vs. intramuscular administration of vitamin B12 for the treatment of patients with vitamin B12 deficiency B12 Injections vs. Oral Supplements: Which Is Better? Frontiers Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta analysis Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency PMC
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