b12 injection vs b12 oral vitamin Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis

b12 injection vs b12 oral vitamin Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis

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Reviewed in the United States on November 27, 2025

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Reviewed in the United States on April 21, 2026

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Reviewed in the United States on January 18, 2026

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