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Frontiers Comparative bioavailability study of supplemental oral Sucrosomial vs. oral conventional vitamin B12 in enhancing circulatory B12 levels in healthy deficient adults: a multicentre, double blind randomized clinical trial Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Vitamin B12 deficiency Nature Reviews Disease Primers The mechanism of absorption of Vitamin B12 Causes and consequences of vitamin B12 deficiency in childhood Medizinonline

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