Royal Canin Hairball Care is made of a specific mixture of dietary fibers, including psyllium (rich in mucilage) and insoluble fibers to help naturally stimulate healthy intestinal transit. As a result, hair swallowed daily can be eliminated from its face rather than mounting up in the stomach and being regurgitated. Cats often spend extensive parts of their day self-grooming and can swallow vast quantities of hair. This ingested hair can become compacted in the digestive tract, resulting in the formation of hairballs that are either regurgitated or passed through its faces. It contains a precise combination of nutrients with a high protein content (34%) and high-fat content (15%) to ensure that a healthy level of nutrients is kept effectively.

Royal Canin Hairball Care has been proven to eliminate twice as much excess hair in a cat's body after just 14 days of feeding.