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Over 1 billion people are deficient in this one vitamin. Are you? Vitamin D isn't even really a vitamin. It's a hormone. And almost nobody talks about this. Over 1 billion people worldwide are deficient. That's 1 in 7 humans on this planet walking around with low levels of something their body desperately needs. Low vitamin D is now linked to: depression, immune failure, cancer, heart disease, diabetes, and even COVID-19 severity. And the terrifying part? You can feel completely fine while