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As daylight drops and vitamin D levels tend to decline, there’s a second nutrient that quietly determines whether your vitamin D does its job: magnesium. The enzymes that activate and deactivate vitamin D are magnesium‑dependent, so low magnesium can look and feel like “stubbornly low vitamin D” even when you’re supplementing. Magnesium 101: What it does and where it lives Magnesium is the body’s fourth most abundant mineral after calcium, sodium, and potassium. In a 70‑kg ad