https://dawgiebowl.com/blog/apple-cider-vinegar-pets/
Looks like the Univ of GA did some work on it too but they have changed their page name and I couldn’t get to it.
First heard of Nettle tea from Dr. Andrew Jones. We also use his feline supplement. Our 14 yr old male neutered cat was running in the 400-750 range when he was first diagnose. After several curves he was on 2 units 2x a day. And on Hill’s prescription dry food. We first moved him to the wet. Then after much reading and watching some of Dr. Jones YouTube videos, we moved him to Fancy Feast classic pates that have 0-1 carbs per can. Charlie usually eats 1.5 cans twice a day. We added the supplement and nettle tea at the same time. Our vet has decreased his insulin (prozinc) to 1 unit only if he is 125 or above twice a day. There are more and more days now that he is not getting at least one of his shots and a few where he is skipping a day altogether. Once I saw a few articles on the ACV, I wondered if perhaps that could get us where we needed to be and off insulin completely.