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In a placebo-controlled study, supplementation with zinc (10 mg/day) for three months in children aged eight to nine years significantly decreased serum iron concentrations, yet not to the extent of causing anemia (23)

Older adults maintain the same 1.5 mcg RNI, but absorption efficiency often declines with age due to reduced stomach acid production and intrinsic factor availability

The morphology of TJ strands was found to be strongly correlated with epithelial barrier function, as indicated by the transepithelial electrical resistance (TER) in the intestinal epithelial cells

In 1 to 3 months, people with lighter skin may notice changes

Here are some examples of foods high in B6, folate (B9), and B12

The obvious reason they do not - and cannot - cite any peer-reviewed research justifying their species-wide minimum heart enlargement measurements is, because none exists