Kidney Support for HorsesKidneys are another area where todays horses are put under extreme stress with a chemical environment. The kidneys primary function is to cleanse the blood and produce urine, which excrete wastes; due to the critical and body encompassing nature of this job, improvement in kidney function will help restore and relieve a wide range of systems and symptoms. Kidney Support for Horses, helps maintain optimal kidney function, and may be beneficial in: