Health Check-In is a starch-based litter additive that gives a quick visual read on a cat's urinary health. Sprinkle it onto any litter and the granules turn a distinct blue within seconds if blood is present in the urine, staying white when everything looks normal.

The color change lasts for up to 48 hours after use, so there's no need to watch the box constantly. Results are based on detecting blood directly rather than measuring urine pH, which the brand states gives a more reliable read than typical pH-based monitoring litters.

One pouch works with most litter types and lasts roughly three weeks in a single box. This product is a monitoring aid, not a diagnostic tool — always follow up with a veterinarian if a color change appears.