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.
Blood Testing
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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.
Less a vitamin than a hormone, and one of the few supplements where deficiency is genuinely widespread at northern latitudes. The right dose varies more between people than for anything else on the shelf.