I discovered a few sources online that will help, like CatInfo.org's food chart and Tanya's FelineCRF.org food lists. Nevertheless, while quite helpful and amazing, I found these lists were not just up-to-date, and a number of the foods cited as very low phosphorous on those lists were not under 0. https://cattoys75185.dgbloggers.com/35952421/5-essential-elements-for-pet-shop-sheikh-zayed-road