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1Seetharam B, Alpers D. Absorption and Transport of Cobalamin (Vitamin B12). Ann Rev Nutr. 1982; 2:343-69.

2Carmel R. The Disappearance of Cobalamin Absorption Testing: A Critical Diagnostic Loss. J Nutr. 2007; 137:2481-2484.

3Herbert V. Vitamin B-12: plant sources, requirements, and assay. Am J Clin Nutr. 1988; 48:852-8.

4Workinger, JL., et al; Systemically Administered Plant Recombinant Holo-Intrinsic Factor Targets the Liver and is not Affected by Endogenous B12 levels. 2019. Sci Rep. 9(1):12269