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Vitamin D gelcaps.

Vitamin D and COVID-19: Is It Data or Noise?

Because random clusters occur naturally in large numbers, only randomized, controlled trials can tell us

Random data shows geographic clusters. Thus some locations will inevitably have higher COVID-19 rates than others. As my example shows, associating these clusters with personal characteristics after the fact is not convincing scientific evidence. That’s where randomized, controlled trials are needed.

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