Hi Weimdad-
One of my cats urine samples recently showed some Struvite crystals. The vet recommended that I give him some cosequin for cats. This is a combination of glucosamine and chondroitin. She explained why it helped, but I can’t remember exactly how. Something about it protecting the lining of the bladder. I bought some, but it is difficult giving cats any kind of medicine or supplement. Do some research and see what you think. It probably would help with your guys joints as well! Take care. 🙂
