Hill's® Prescription Diet® y/d™ Feline

Prescription Diet y/d is the safe, effective and easy way to manage thyroid health. Clinically proven nutrition to restore thyroid health in 3 weeks.

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  • Key Benefits

    Prescription Diet y/d is the safe, effective and easy way to manage thyroid health. Clinically proven nutrition to restore thyroid health in 3 weeks.

    * 100% Satisfaction Guarantee - if you are unsatisfied for any reason, return the unused portion to the place of purchase for a full refund or replacement.





    Not Recommended For:

    Growing kittens, pregnant or nursing cats.

    Evidence-Based Clinical Nutrition:

    Limited iodine intake to control thyroid hormone (T4) production1-3
    Improves thyroid health in 3 weeks* (when fed as the sole source of nutrition)1
    Clinically proven nutrition to restore thyroid health, no pilling necessary1-3
    Complete daily nutrition with a taste cats love



    Additional Info:

    S+OXSHIELDTM: Formulated to promote a urinary environment that reduces the risk of developing struvite & calcium oxalate crystals

    Other Products to Consider

    No other products have the carefully limited iodine level of y/d to manage feline hyperthyroidism


    1 Yu S, Wedekind KJ, Burris PA, et al. Controlled level of dietary iodine normalizes serum total thyroxine in cats with naturally occurring hyperthyroidism. J Vet Intern Med 2011;25:683-684. Abstract.
    2 Melendez LD, Yamka RM, Forrester SD, et al. Titration of dietary iodine for reducing serum thyroxine concentrations in newly diagnosed hyperthyroid cats. J Vet Intern Med 2011;25:683. Abstract.
    3 Melendez LD, Yamka RM, Burriss PA. Titration of dietary iodine for maintaining normal serum thyroxine concentrations in hyperthyroid cats. J Vet Intern Med 2011;25:683. Abstract.

    *Urine pH of individual cats may vary due to complicating factors such as time of feeding before urine collection, type of urine collection, individual animal variation, and test methodology.

  • Feeding Guide

    How to adjust feeding amounts to maintain optimal weight.

    Because iodine intake from other food sources -- treats, another cats food, etc. -- can compromise the effectiveness of low-iodine nutrition, its critical that you follow your veterinarians feeding instructions carefully and feed only y/d.
    Adjust feeding amounts as necessary to maintain optimal weight. Monitoring your patient's condition will assure the nutritional recommendation provides the best results.

    • Reinforce with clients to feed Prescription Diet dry and/or canned food.
    • Gradually transition to the new food over a 7 day period.

    Adult maintenance

    Weight of Cat Amount per Day
    2 kg 35 g
    3 kg 45 g
    4 kg 60 g
    5 kg 70 g
    6 kg 80 g
    7 kg 90 g

  • Ingredients

    High quality protein and thoughtfully sourced ingredients.

    Corn Gluten Meal, Pork Fat, Whole Grain Corn, Soybean Mill Run, Egg Product, Chicken Liver Flavor, L-Lysine, Potassium Citrate, Lactic Acid, Dicalcium Phosphate, Fish Oil, Choline Chloride, Calcium Carbonate, Calcium Sulfate, DL-Methionine, Taurine, L-Tryptophan, Brewers Dried Yeast, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Niacin Supplement, Thiamine Mononitrate, Calcium Pantothenate, Vitamin A Supplement, Riboflavin Supplement, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Folic Acid, Biotin, Vitamin D3 Supplement), minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganese Sulfate), L-Carnitine, Mixed Tocopherols for freshness, Natural Flavors, Beta-Carotene

  • Average Nutrient & Caloric Content

    4147 kcal/kg

    Nutrient As Fed1
    Dry Matter2
    As Fed, Caloric Basis3
    g/100 kcal
    Protein 34.1 36.3 8.2 g / 100 kcal
    Fat 24.2 25.8 5.8 g / 100 kcal
    Crude Fiber 2.9 3.1 0.7 g / 100 kcal
    Carbohydrate / NFE 26.8 28.5 6.5 g / 100 kcal
    Calcium 0.89 0.94 214 mg / 100 kcal
    Phosphorous 0.62 0.65 148 mg / 100 kcal
    Sodium 0.24 0.25 57 mg / 100 kcal
    Potassium 0.78 0.83 189 mg / 100 kcal
    Magnesium 0.062 0.066 15 mg / 100 kcal
    Iodine 0.2 ppm 0.2 ppm 4.53 ug / 100 kcal
    Taurine 0.32 0.34 76 mg / 100 kcal
    Carnitine 611.6 ppm 650.6 ppm 14.75 mg / 100 kcal


    1Differs from label guarantees which are either maximums or minimums.
    2The nutrient in the product after moisture is removed. It is used to make direct comparisons of nutrient profiles with differing moisture contents.
    3Nutrient intake for every 100 kilocalories consumed.

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