Be in the know about your cat's doings as soon as they do their business. Simply sprinkle our Health Check-In™ Boosters™ litter additive onto your usual litter and get an instant health update on your feline. Our easy-to-understand monitoring formula will show results for 48 hours and the granules will turn blue if blood is detected, staying white when your cat is in good health. Approved by vets and clinically tested, it's the safe and trustworthy way to keep an eye on your furry friend's well-being.