Urine saturation for struvite was significantly lower when cats received supplement compared with placebo (supplement = 0.364 ± 0.193, placebo = 1.565 ± 1.284; p = 0.04) and 24-hour urinary excretion of phosphorous was lower when cats received supplement compared with placeb0.o (supplement = 44.89, range = 24.4 -61.3 mg/kg/24h; placebo = 50.75, 41.4 -63.5 mg/kg24h; p = 0.04).