Hello, I found a few supplements that are good to give, such as probiotics, enzymes, fish oil, vitamins, etc. I have one picky cat & one cat that will pretty much eat whatever I put down. Lately I've been giving D-Mannose & a probiotic for breakfast & then egg lecithin for dinner. Oh also I've been putting pumpkin in the food because my cats seem to strain a bit when they go poop. So, when I "load up" the food, no one will eat it. Even my fat cat won't touch it. I really don't know how anyone gets their cats to eat food with supplements added. I had a time with the fish oil so I have given up. I seriously don't want to syringe them, any suggestions?