Hill's Prescription Diet y/d is a veterinary wet cat food formulated specifically to manage thyroid health in adult cats. Designed as a complete sole-source diet, it works by restricting iodine intake to help reduce excess thyroid hormone production — the primary dietary approach for feline hyperthyroidism. Available in 156g cans, sold in cases of 24 or 48.

The y/d formula achieves thyroid management through strict iodine restriction rather than medication alone, making it a long-term dietary option for cats diagnosed with hyperthyroidism. Each can provides complete and balanced nutrition — protein, fat, and essential vitamins — so no supplemental feeding is required. Developed with veterinary nutritionists and manufactured in the USA, the pâté texture is palatable for most adult cats, including those with reduced appetite.

Owners managing feline hyperthyroidism often find y/d a practical complement or alternative to daily medication — particularly useful for cats that resist tablets. The canned format supports hydration, which matters given cats with hyperthyroidism often have concurrent kidney concerns. Requires a veterinary prescription.