Kidney C.O.P. is patented formula has shown to reduce calcium oxalate crystal growth rate and stone formation by 99%. Learn how Kidney C.O.P.® works. It has been Shown to Reduce and Inhibit the Growth and Formation of Calcium Oxalate Crystals by 99% During Testing. Kidney C.O.P.® Helps Stop Calcium Oxalate Growth & Formation with 99% Inhibition of Calcium Oxalate Crystals, Patented Formula with Clinically Researched Ingredients, Reduces the Growth Rate of Calcium Oxalate Crystals and Supports Proper Kidney Function and Health.