🦴 There are four tiny glands sitting behind your thyroid that quietly control your calcium levels — and most people have never heard of them. They're called the parathyroid glands, and they release a hormone that does something really clever: it signals the kidneys to activate vitamin D. And here's why that matters — activated vitamin D is what allows your body to actually absorb calcium. Without it, your body can only take in a fraction of the calcium you consume. 💡 So it's a chain reaction:

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