There are many nuances and people seem bad at understanding those. Too many are getting their information from "health influencers" and 30 second videos, which is why we seem to bounce between the two extremes of "everyone should take Vitamin D!" and "Vitamin D is overrated!".
Australia has tried to explain sun safety here, taking into account that Vitamin D is best obtained from sunlight:
Yeah not bad, though UV index of 3 is pretty comically low. Here in Manila it's basically full cloud conditions.
I'd be interested to know a curve, i.e. at UV index 8, 3 minutes exposure, at index 6, 10 minutes exposure, etc. Maybe with a scaling for skin tone. It seems like either this kind of study has never been done (perhaps for ethical reasons) or else the information is not being disseminated. The latter seems to happen often in the medical space for paternalistic reasons, which honestly make sense for the broad public but it should be available for people to find who are motivated and have a deeper interest anyway.
Australia has tried to explain sun safety here, taking into account that Vitamin D is best obtained from sunlight:
https://www.cancer.org.au/cancer-information/causes-and-prev...