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The NIH estimates that 10 to 30 percent of adults over 50 have some degree of B12 malabsorption
However, the adverse events were described as mainly transient and mild-to-moderate in severity
W., Fam, B., Summers, R., Conway-Campbell, B., Waters, M
Additionally, 15 of the included studies focused on B12 supplementation, with a total of 5,191 participants (mean: 346 per study)
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