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Vitamin D isn’t just another supplement — it’s a foundational nutrient that influences everything from your mood and immunity to hormone balance and bone health. And yet, an estimated 40% of adults  in North America are deficient. Why? Because most of us spend our days indoors, covered in sunscreen, and living in climates that don’t provide consistent sunlight year-round (hello, Vancouver). Let’s explore what Vitamin D does, why it matters, and how to make sure you’re getting