Why Do We Need Vitamin D?
Your body can make Vitamin D from sunlight — so why is nearly half the global population still deficient in it?
In this episode of So That's Why, Jen, Chris, and Matt unpack what Vitamin D is actually doing inside the body, why the sunshine route fails so many people, and why deficiency shows up as fatigue, frequent illness, and muscle weakness rather than just weak bones. Along the way, they bust the sunscreen myth, explain why D3 is not the same as D2, and make the case for why Vitamin D supplementation is one of the most cost-effective health decisions available.
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The skinny
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