According to the National Academy of Medicine, formerly known as the Institute of Medicine, 4,000 IU is the safe upper level of daily vitamin D intake. However, doses up to 10,000 IU have not been shown to cause toxicity in healthy individuals (11Trusted Source, 16Trusted Source).
Vitamin D toxicity is generally caused by excessive doses of vitamin D supplements, not by diet or sun exposure (17Trusted Source, 18Trusted Source).
Although vitamin D toxicity is a very rare condition, recent increases in supplement use may lead to an increase in reported cases.
A daily intake ranging from 40,000–100,000 IU (1,000–2,500 mcg), for 1 to several months, has been shown to cause toxicity in humans (15Trusted Source, 19Trusted Source, 20Trusted Source, 21Trusted Source, 22Trusted Source).
Vitamin D toxicity is generally caused by excessive doses of vitamin D supplements, not by diet or sun exposure (17Trusted Source, 18Trusted Source).
Although vitamin D toxicity is a very rare condition, recent increases in supplement use may lead to an increase in reported cases.
A daily intake ranging from 40,000–100,000 IU (1,000–2,500 mcg), for 1 to several months, has been shown to cause toxicity in humans (15Trusted Source, 19Trusted Source, 20Trusted Source, 21Trusted Source, 22Trusted Source).
https://www.healthline.com/nutrition/how-much-vitamin-d-is-t...