Royal Canin Veterinary Anallergenic is a prescription dry food for adult cats diagnosed with severe food allergies or intolerances. It's used under veterinary guidance for elimination trials and long-term management of Adverse Food Reactions, where standard hypoallergenic diets haven't been enough to control symptoms like chronic itching, ear inflammation or digestive upset.

The formula is built around extensively hydrolysed feather protein, broken down to a molecular size small enough to slip past the immune response that triggers reactions. Carbohydrates come from purified starch rather than whole grains, removing another common source of residual allergens. The kibble is complete and balanced for adult maintenance, with a controlled nutrient profile suited to cats being managed for both allergies and weight.

Owners choose Anallergenic when their vet has ruled out other diets and needs a formulation with minimal antigenic risk. It's not a general-purpose sensitive-stomach food — it's the step taken when a definitive elimination trial or long-term management plan is required.