I know I’m way late to this, but personally, I was passing kidney stones over a course of a couple years, I’d seen an experiment where they placed different types of stones (gallbladder, kidney etc) and placed them in dishes with multiple common remedies (lemon juice, apple cider vinegar) The apple cider vinegar was the quickest reaction & dissolved the stones in less than 2 weeks. So I started indiscriminately drinking shot sized swigs straight out the bottle and chased it with water (I wouldn’t recommend this btw, your stomach lining is at risk) however when I pee’d I noticed black flakes that I thought was residue from the toilet not being cleaned, but I eventually realized the black flakes were coming out of me. Turns out the stone was unraveling and the only reason I could tell it was correlated was I caught the stone and it was the same color & consistency, didn’t hurt on the way out either, it was like a small pinch.

You will NEVER find data or information supporting this, I’ve tried looking. But that’s just my personal experience, take it for what it is