I have to make my problem-cat homemade food. She’s allergic to grains and then developed struvite crystals. All the food for urinary issues are loaded with grains and all the grain-free food back then was high in phosphorus and magnesium.
Luckily she’s a good eater, so it hasn’t been a problem. I’m sure it’s lots cheaper than the grain-free food or the C/D prescription food, even after buying all the supplements to add to the meat.
There’s some weird chemical that cats have to have that they can only get from a supplement or the prey’s organs. I can’t remember what it is. You should probably look into it.