From "The Big Vitamin D Mistake" by Dimitrios T. Papadimitriou (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5541280/)

> This could lead to a recommendation of 1000 IU for children <1 year on enriched formula and 1500 IU for breastfed children older than 6 months, 3000 IU for children >1 year of age, and around 8000 IU for young adults and thereafter. Actions are urgently needed to protect the global population from vitamin D deficiency.

Then, a person that consumed from 8000 IU to 12000 IU per day and had kidney damage due to high calcium levels in his blood.

https://www.webmd.com/vitamins-and-supplements/news/20190408...