> Source? There have been many articles on HN showing the RDA to be ~10x too low (something like 5,000 IU) and that the daily safety limit to be significantly higher than that (something like 30,000 IU).
First: the RDA and the safety limit are not the same, and an RDA in a country being too low does not mean that the maximum safe dose is wrong.
And it certainly does not mean that there is a higher risk in under-dosing than overdosing when taking the RDA (which already includes recommendations for supplementing if you spend most of your time indoors).
I'm not a scientist, so I only know what physicians told me and what's explained in news publications or by consumer advocacy non-profits.
Here are a study (which I didn't read) and the NHS's advise on Vitamin D toxicity:
https://www.ncbi.nlm.nih.gov/books/NBK557876/
https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-...
The study says:
> Most cases of vitamin D toxicity resolve without serious complications or sequelae. However, in some instances, severe hypercalcemia can lead to acute renal failure requiring hemodialysis. Cases of permanent renal damage due to vitamin D toxicity are rare.
Which sounds good, but I don't think it supports that there is no risk of oral Vitamin D overdose.
First: the RDA and the safety limit are not the same, and an RDA in a country being too low does not mean that the maximum safe dose is wrong.
And it certainly does not mean that there is a higher risk in under-dosing than overdosing when taking the RDA (which already includes recommendations for supplementing if you spend most of your time indoors).
I'm not a scientist, so I only know what physicians told me and what's explained in news publications or by consumer advocacy non-profits.
Here are a study (which I didn't read) and the NHS's advise on Vitamin D toxicity:
https://www.ncbi.nlm.nih.gov/books/NBK557876/
https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-...
The study says:
> Most cases of vitamin D toxicity resolve without serious complications or sequelae. However, in some instances, severe hypercalcemia can lead to acute renal failure requiring hemodialysis. Cases of permanent renal damage due to vitamin D toxicity are rare.
Which sounds good, but I don't think it supports that there is no risk of oral Vitamin D overdose.