Earlier quoted context omitted.
Therefore what to do? I have seen these Hacker News vitamin D ads appear every few months for the past 15 years, or so. I always seem to have a vitamin D deficiency, so it reminds me to take supplements. I take them for a few months, hoping to see a change, but I don't feel any benefit. Then, I forget to take the supplements until the next time I see an ad. How to know if they're actually doing something useful?
Until you see an article like this which calls for '5000 mg ' of supplementation, decide that you didn't take enough and overdose... HN and dubious self-medication advice go hand-in-hand. Please consult a medical professional instead of a bunch of ad-tech devs.
Good times.
HN is as bad at medicine as it is at everything else.