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Vitamin D toxicity stems from hypercalcemia rather than the vitamin itself. Proper co-factors like K2, magnesium, and hydration make targeted protocols safe.
Involved in hundreds of reactions and depleted by exactly the things modern life supplies. The form on the label determines what it actually does.
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.