Know your cat’s business the second they do theirs. Sprinkle our Health Check-In™ Boosters™ litter additive onto your litter and instantly get an indication of your cat’s health. Our easy-to-read health monitoring formula shows results for 48 hours and turns granules a distinct blue when blood is detected and stays white when your cat is healthy. Vet-approved and clinically tested, meet the safe and reliable way to monitor your feline friend’s health.