That previous commentary on part 2 hasn't explored the larger statistical significant over time. Yes, it _can_ cause problems, but there is far more evidence to show deficiency, and far less evidence to show that even when taken at high levels there aren't many cases of problems, and those problems are not very severe.

Here's some studies regarding vitamin toxicity and specifically Vitamin D3 including death rates: https://www.medscape.com/answers/819426-102375/what-is-the-p...