Royal Canin Veterinary Diet Renal formulated to support renal function in case of chronic kidney disease. Contains EPA and DHA, a complex of antioxidants and a low phosphorus level. During CKD, phosphorus is no longer eliminated effectively by the kidneys. A restriction in phosphorus intake is essential to slow down the development of renal disease. Feeding a diet with adapted fish oil (source of EPA/DHA) content is likely to improve the glomerular filration rate.