I've been using Paws by Charlotte's' Web for about 5 years
https://www.healthyhemp.com/product/charlottes-web-paws-pure-hemp-extract-oil-in-mct-oil-1-oz/
It's expensive but I only give 3 drops a day & it lasts a long time. ( the label dosage is for a dog I found for my cats 3 drops work best.)
My Vet called Cornell University To ask them about a recommendation They said Paws by Charlotte's Web Or ElleVet Sciences for Felines
https://ellevetsciences.com/products/feline-oil
They told him they had tested a lot of popular CBD oil & a lot of them had barely any cannabinoids in them. You do need to be careful what you buy. My vet has been using it for his dog with severe arthritis. He said he sees a definite improvement.
Fortiflora for cats is also helpful. My 3 cats are very picky about me putting "anything " in their food. Occasionally I'll Dust a tiny bit of the Fortiflora on Ravan's food when he's really off from eating. He will usually eat it then.
Let me know if you use it & if it works for your kitty

The CBD might take a day or 2 till it kicks in. If I could afford it I'd buy it for myself !
Are you on the Lantus forum? I don't see a SS (spread sheet) for your cat?
The advisors here as so Knowable they can advise you about dosing & so much more! If your kitty had a UTI you can give it D-Mannose It's derived from cranberry you just mix it in water & give it with a feeding syringe It keeps bacteria from sticking to prevent UTI's
There's a lot to learn & it would be very helpful if you were on the lantus forum