Hill's y/d Thyroid Care Cat Dry Food, 1,5kgHill's y d Thyroid Care Cat Dry Food Hill's Prescription Diet y d Dry Cat Food is an easy and convenient way to reduce the iodine levels in food for cats with hyperthyroidism. For best results, consistent long term feeding of this product is critical for efficacy of the product benefits. Dry and canned formulas can be mixed or fed concurrently. How it works: Limited iodine Reduced phosphorus and sodium with omega 3 fatty acids from fish oil High