Isn't 10,000IU way above the recommended limit? I went through a bottle this past winter (at the recommended dosage) and didn't notice a change in either direction, but was a bit confused during the research phase since everyone seems to use a wildly different dosage.

https://ods.od.nih.gov/factsheets/VitaminD-Consumer/

https://www.hsph.harvard.edu/nutritionsource/vitamin-d/

edit: I also found https://news.ycombinator.com/item?id=35878761 which suggests higher levels are safe, as long as you're not eating D3 pills like kettle chips. So I guess that answers it, though my points stands about there being such a wide range of info