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Efficacy of sublingual versus oral vitamin B12 supplementation for the treatment of vitamin B12 deficiencyA prospective randomised open label study Clinical Nutrition ESPEN B12 Injections vs Pills: Richmond's Complete Guide B12 Under the Tongue: Uses, Benefits and UK Guidance Bolt Pharmacy Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta analysis PMC
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