Iron: Where Both Deficiency and Excess Do Damage
The nutrient most likely to be supplemented without testing, and one of the few where being too high is as harmful as being too low.
Iron
The nutrient where both deficiency and excess are common and both do damage. Ferritin is an acute-phase reactant, so a normal result can hide depletion during inflammation. These pages cover reading the panel properly and why supplementing without testing is a bad idea.
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