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A serum B12 test (and ideally methylmalonic acid or homocysteine if your B12 is borderline) gives you a real answer rather than a guess
The FDA does not recognize it as a drug, biologic, or dietary supplement with an approved therapeutic claim
Extending recommendations to all ages increased the impact to 104,000 hospitalizations (95% CI, 55,000-153,000) and 9,000 deaths (95% CI, 4,000-14,000) averted
Vitamins A and D also improve gut barrier integrity through modulating TJ protein expression, with reduced vitamin A consumption in rats resulting in impaired TJ barriers most likely a consequence of the decreased expression of ZO-1 and occludin also reported
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