I also had a young cat get kidney failure for no reason what-so-ever, in 2016. After spending a ton of money at a vet clinic that just wanted to push pills, do expensive tests and tell me he was gonna die anyway, I found www.petwellbeing.com and ordered some Kidney Support Gold drops for him. They have fabulous reviews and I am sure they saved my Simba's life. I also started him on a liquid vitamin called "Lixotinic". The Lixotinic helps pump up their appetite and gives them energy. I mix the kidney drops and the Lixotinic together and give it to him in a syringe. The taste of the vitamins helps mask the drops taste, which they do not like. Anyway, he has turned around totally, has gained back his weight and his kidney values have been normal for a couple years. Petwellbeing.com also has many other drops for different ailments, most with very good reviews. Please check it out.