This is an anecdotal case where it was problematic. You should definitely talk with a nutrionist/doctor to get your levels checked, but please don't assume that

This is an anecdotal case where it was problematic. You should definitely talk with a nutrionist/doctor to get your levels checked, but please don't assume that just because this story called out a problem (anything in too much can be a problem) that it's the normal story. I can name several more anecdotal cases of people taking 5,000IU a day for many more years than described here with no harmful effects (and much healthier than similar people). Anecdotal stories shouldn't be counted either way, but I've seen far more studies that show the deficiency of Vitamin D3 than overdose. Here's some data: https://www.medscape.com/answers/819426-102375/what-is-the-prevalence-of-vitamin-toxicity-in-the-us https://www.medscape.com/answers/819426-102375/what-is-the-p... It's very, very rare. It can happen, but this is a gross misrepresentation of data.