Aha! Add activated charcoal to your arsenal. It helps adsorb heavy metals in your gut so that they don't even make it to the kidneys.
When I discovered that I had Gallstones (three weeks ago), I stopped using AC so I could monitor the color of my stool. And then I started taking the molybdenum and milk thistle and feeling better so I didn't go back to reusing the AC.
So, then my kidney had to deal with all the heavy metals/toxins unaided and wham! That's why I'm experiencing kidney pain.
I'm strongly recommending getting the Activated Charcoal. it will help avoid kidney pain. Just remember to take the AC hours away from meals or medications so it won't adsorb any nutrients or drugs you're taking.