Yes it is. I hope it works for Leo!
Sometimes Ravan just goes off his food for a day & "nothing" will get him to eat. I've learned to just let him be for the day. He always gets hungry by evening.
I recently tried the Alnutrin ( maybe you read about it in Bellas post?)He loved it at first but now he barely touches it.
The Purina Pro Plan Focus Urinary Tract Health Formula is 4% carbs & 187 Phosphorus the best I found so far.
Amazingly all 3 of my kitties will eat it . They're not crazy about it but a spoonful here & there. I wonder if Purina adds the FortiFlora to it?
I try not to push too much food with Ravan. He's always been a good weight. 13 -14 lbs. Right now I'm feeding less because he's looking too chubby.
I've read that cats should be on the thinner side It's much healthier for them (for us too!) I'm always work'in on that!
I've always felt dry food was not natural to feed any animal It was created for our convenience. Now with Ravan's Kidney disease I am never going near any dry food. Not even treats.
For Ravan a treat is me loving him , & maybe a piece of raw liver or chicken!
I just peeked at Leo's SS He's looking better already!!

A few more days & will see what this dose does.
Have a relaxing evening