I was at 5k/day of D3. My cardiologist said that dosage might cause kidney stones. I began researching that tonight and found "
Vitamin D Intake and the Risk of Incident Kidney Stones" in the Journal of Urology, February 2017, by Pietro Manuel Ferraro, Eric N. Taylor, and Gary C. Curhan. It doesn't look like D3 up to 1,000 has much effect on kidney stones. But the authors didn't check high dosages of 5k to 10k.
I take 10,000 IU of vitamin D3 a day but I also take vitamin K. One of my supplements is actually a combo D3/K tablet. The K apparently takes care of the excess calcium from the D, which hopefully protects my kidneys.