alt Hacker NewsSame 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.
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.
That's an absurd 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.