Here is my experience to improve kidney function:
A friend on dialysis for 7 yr. Asked him if he urinates since that procedure sucks so much out of you. Yes, but just the color of water. Thought mine was quite pale so I decided it was time to take Dr Schulze’s Kidney/Bladder Tincture for 3 weeks. Color and odor improved, so figured it was working well. Then a yr ago Dr had me do a blood test, one of the tests was for GFR [kidney] function. There are 5 category groups. #1 was when a baby, #5 when you needed dialysis. I was #2. Not bad for someone in their 60’s!
As for my friend, his brother was a Dr and even tho I mentioned I do herbs, time ran out.
As for stones, I found that using distilled water most of the time eliminated my stone problem.