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A comment on Vitamin D supplementation to prevent acute respiratory tract infections (2017). Parent comment

Re:Vitamin D supplementation to prevent acute respiratory tr... by qbaqbaqba on Tuesday March 03, 2020 @01:48AM (#22472371)
> 2000 UI of vitamin D daily

If you can, you should ask your physician to have your vitamin D level marked. Too much is not good either.

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Re:Vitamin D supplementation to prevent acute respiratory tr... by bad_user on Tuesday March 03, 2020 @02:24AM (#22472528)
I've checked my 25-OHD levels before (which prompted my doctor to recommend vitamin D supplements) and 6 months after.

95% of the population need supplementation with 1700 UI to reach a serum level of 75nmol/L (considered optimal) [1]. Men can metabolize 3000-5000 UI [2]. The body adapts to higher doses by stopping solar synthesis thus we can tolerate up to 10000 UI [3].

Also vitamin D is a fat soluble vitamin and a supplement isn't necessarily absorbed well. Thus 2000 UI is generally recommended for individuals that have sub-optimal levels (this was a prescription from my doctor which is fairly standard) and it isn't considered toxic if you take up to 10000 UI.

[1]: https://www.ncbi.nlm.nih.gov/pubmed/17344484

[2]: https://www.ncbi.nlm.nih.gov/pubmed/12499343

[3]: https://www.ncbi.nlm.nih.gov/pubmed/10232622

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