I know Mark uses Fotekor on Clapton to very good effect, and I'm sure others here use it too.
Max's creatitine levels a few weeks ago came in at over 500, but they think that was also to do with the urinary tract infection that we're still treating. Has his wee been tested too?
I was asking about Fortekor as well recently, but my vet didn't seem to think that it does push the levels higher to start with, so there really is some mixed information out there which can be confusing.
Sending a gentle headrub to Korky, hope his levels stabilise again soon