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People should get their calcium and PTH levels checked before taking larger doses of vitamine D as low vitamine D could be result of hyperparathyroidism. In this case vitamine D can kill you (and for sure will give you cognitive problems, brain fog and such).

Most doctors/endocrynologists is poorly trained to deal with that..

Belive me I have been there (had low vitamine D and high calcium due to thyroid cancer affecting parathyroid glands and had been prescribed vitamine D by incompetent endocrynologist) and this article helped a lot..

https://www.parathyroid.com/low-vitamin-d.htm

Is this what you are referring to, the lady taking 130,000 IU per day? https://pubmed.ncbi.nlm.nih.gov/33030138/ https://news.ycombinator.com/item?id=24734774

This is why I occasionally take vitamins, but not everyday. It's easy to over do it and cause more harm than good.

The frequency has much less to do with it than the absolute amount, at least for fat soluble vitamins like vitamin D. Taking 2000IU on 3 separate days isn't much different from taking 6000IU at 1 day.