VHN FEL Urinary S/O Royal Canin Urinary S/O Dry Food for Cats is a complete and balanced veterinary diet for cats that has been specially designed to treat kidney stones and bladder problems. Made with a carefully formulated recipe to help with the dissolution of struvite uroliths, Royal Canin Urinary Vet Diet also helps to reduce the risk of recurrent struvite and calcium oxalate urolithiasis. Key Benefits: Struvite Dissolution: Effectively dissolves struvite uroliths Urine Dilution: Decreases the urinary concentration of struvite and calcium oxalate crystals, and ensures regular bladder wash-out Low RSS: Low Relative Super Saturation diets encourage an undersaturated urinary environment Low Magnesium: Magnesium is a component of struvite uroliths