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Very low oral doses of vitamin B-12 increase serum concentrations in elderly subjects with food-bound vitamin B-12 malabsorption.
Blacher J, Czernichow S, Raphaël M, Roussel C, Chadefaux-Vekemans B, Morineau G, Giraudier S, Tibi A, Henry O, Vayssière M, Oudjhani M, Nadaï S, Vincent JP, Bodak A, Di Menza C, Ménard J, Zittoun J, Ducimetière P. Blacher J, et al. Among authors: vayssiere m. J Nutr. 2007 Feb;137(2):373-8. doi: 10.1093/jn/137.2.373. J Nutr. 2007. PMID: 17237314 Free article. Clinical Trial.