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 ) B12 Complex Methylated Vitamin 1000mcg, Sublingual, Clean Igennus Igennus Healthcare Nutrition Vitamin B12 Sublingual Spray for Energy, Focus & Clarity Vitonnix Comparison of sublingual vs. intramuscular administration of vitamin B12 for the treatment of patients with vitamin B12 deficien
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