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Which Is Better? Sublingual B 12 vs. Vitamin B 12 Pills. 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 ) How to judge the absorption of vitamin B12 Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta analysis PMC
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