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Confusing the two is the most common way to under- or over-draw
It reduces iron from the ferric to the ferrous state in the intestine to allow absorption, is involved in the transfer of iron from plasma transferrin to liver ferritin, and regulates iron distribution and storage by preventing the oxidation of tetrahydrofolate
Almost every other article either dodges this question or buries it under "ask your dentist." Here's the real picture across the four main routes, as of 2026: A couple of things worth knowing that tend to get left out: the NHS will only fund a guard if it's clinically necessary, not just because you fancy one as a precaution
The long-term safety profile in humans is not established due to the absence of extended clinical trials
