Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project 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 ) Sublingual B12 Is it More Effective to Take it Under Your Tongue? WhyNotNatural Efficacy of sublingual versus oral vitamin B12 supplementation for the treatment of vitamin B12 deficiencyA prospective randomised open label study Clinical Nutrition ESPEN
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