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Not to mention that one of the premises of the article was that vitamin d levels were a marker, not some singular responsible agent.

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The conclusion that vitamin D levels are an effect not a cause came from exploring the mechanisms. And yes, it may turn out that NO similarly is a marker.

It's ironic that the author didn't consider that getting sunlight may similarly be the side effect of the true cause of the stated benefits (being active?).

It may be, but NO itself is also very much a vasodilator, and used therapeutically for that.

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