Urinary Calm is specially formulated for adult cats to prevent (reoccurring) struvite and calcium oxalate formation and to reduce stress. To help reduce stress and the risk of Feline Idiopathic Cystitis (FIC), three ingredients are added to TROVET Urinary Calm: green tea extract, milk protein hydrolysate and tryptophan. Urine volume has the greatest effect on the formation of all bladder and kidney crystals, in which a large urine volume reduces the chance of crystal formation. The sodium level is slightly increased to promote water intake and increase urine volume.