[OutOfHere]

Just mildy exaggerated? Is this a joke article? If you don't achieve a suitable level, health will suffer immensely, even permanently. There are no ifs and buts. People who say otherwise work for the medical industrial complex and will get you killed.

Note that adequate magnesium is critical for proper vitamin D function, but the article doesn't document it.

[gblargg]

Same for breathing oxygen, if you don't get it you'll die, but for most people oxygen supplementation would not be worth even knowing about.

[OutOfHere]

That's a remarkably horrible analogy. Vitamin D is a vitamin that is in large part derived from significant sunlight exposure. Vitamins are essential by definition. Sunlight exposure is highly insufficient by historical standards. This is why supplementation is absolutely necessary in almost everyone who is not a full time outdoor worker.

In contrast, the air contains oxygen which is sufficient for most people with normal lung function.