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Vitamin B12 tablets are available in high dosages far above the recommended dietary allowance, but these high amounts are not necessarily the amount that will be absorbed because an adequate amount of intrinsic factor is also needed

[DOI] [PMC free article] [PubMed] [Google Scholar] 134.Huang Y, He S, Li JZ, Seo Y-K, Osborne TF, Cohen JC, et al

and, because it is generally not covered by most Health Insurance plans, is typically paid out-of-pocket or financed with high interest rate loans

Hughes EC, Syed HA, Saleh D

The two have never been tested against each other, and the headline figures (roughly 20.4% vs 20.9%) come from different trials in different populations