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Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency PMC Efficacy of sublingual versus oral vitamin B12 supplementation for the treatment of vitamin B12 deficiencyA prospective randomised open label study Clinical Nutrition ESPEN Vitamin B12 Injection: Benefits, Uses and Who Needs It Periville Pharmacy Frontiers Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta analysis
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