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Home
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Hill's Prescription Diet
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z/d Low Fat Hydrolysed Soy Dry Dog Food

z/d Low Fat Hydrolysed Soy Dry Dog Food

Hill's Prescription Diet
4.6
(
11
)
Hill's Prescription Diet z/d Low Fat Hydrolysed Soy Dry Dog Food is a hypoallergenic dry diet formulated for dogs with food sensitivities or adverse food reactions who also require a reduced fat intake. Many dogs with food allergies or intolerances develop symptoms such as chronic itching, ear infections, recurring digestive issues, and skin inflammation that can be difficult to manage. This formula uses hydrolysed soy protein — broken down to a molecular level unlikely to provoke an immune response — while maintaining a low fat profile to support tolerability in sensitive digestive systems. Formulated by Hill's nutritionists and veterinarians, it is designed to be fed as a sole diet to effectively identify and manage food-related reactions. It provides complete and balanced daily nutrition in a convenient dry format. Always consult your veterinarian before introducing this diet as part of an elimination or long-term allergy management programme.
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Size 1
7.9kg
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Overview

Hill's Prescription Diet z/d Low Fat Hydrolysed Soy Dry Dog Food is a hypoallergenic dry diet formulated for dogs with food sensitivities or adverse food reactions who also require a reduced fat intake. Many dogs with food allergies or intolerances develop symptoms such as chronic itching, ear infections, recurring digestive issues, and skin inflammation that can be difficult to manage. This formula uses hydrolysed soy protein — broken down to a molecular level unlikely to provoke an immune response — while maintaining a low fat profile to support tolerability in sensitive digestive systems.

Formulated by Hill's nutritionists and veterinarians, it is designed to be fed as a sole diet to effectively identify and manage food-related reactions. It provides complete and balanced daily nutrition in a convenient dry format. Always consult your veterinarian before introducing this diet as part of an elimination or long-term allergy management programme.

Nutritional Analysis

Protein
27
%
0%
Fat
7.4
%
0%
Fibre
4.5
%
0%
Ash
2.68
%
0%
Carbohydrates
55.4
%
0%
Energy
319.8
0
 kcal/100g

Ingredients

Corn Starch, Hydrolyzed Soy Protein, Powdered Cellulose, Dicalcium Phosphate, Soybean Oil, Hydrolyzed Chicken Flavor, Ground Pecan Shells, Coconut Oil, Lactic Acid, Potassium Chloride, Flaxseed, Glyceryl Monostearate, Dried Beet Pulp, Dried Citrus Pulp, DL-Methionine, Fish Oil, Choline Chloride, Calcium Sulfate, Pressed Cranberries, Vitamins (Vitamin E, L-Ascorbyl-2-Polyphosphate, Niacin, Thiamine Mononitrate, Pyridoxine Hydrochloride, Calcium Pantothenate, Riboflavin, Vitamin A, Biotin, Vitamin B12, Folic Acid, Vitamin D3), Calcium Carbonate, Iodized Salt, Taurine, Magnesium Oxide, Minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), L-Tryptophan, Mixed Tocopherols for Freshness, Natural Flavors, L-Carnitine, Beta-Carotene.

Ingredient images are illustrative only and may not represent the exact source or form used by manufacturers.
Fine white corn starch powder in a soft, fluffy mound on a plain background, highlighting its smooth texture
Corn Starch
Corn Starch
Maize Starch, Zea Mays Starch, E1401, Maizena
Summary
Corn starch is a fine, white powder derived from the endosperm of corn kernels, making it a plant-based ingredient. It is primarily used as a carbohydrate source and functional thickener in pet foods, aiding in texture and digestibility. Corn starch is utilised in its processed, refined form rather than as whole corn, ensuring consistency and optimal absorption in formulated diets.
Why it's used?
Corn starch is included as a cost-effective carbohydrate source and bulk-adding agent, helping to optimise product texture and binding. It also contributes to shelf stability by absorbing moisture and preventing spoilage.
Fine, pale beige powder with a slightly grainy texture, showing hydrolysed soy protein for dog nutrition
Hydrolysed Soy Protein
Hydrolysed Soy Protein
Hydrolyzed Soy Protein, Hydrolysed Soya Protein, Hydrolyzed Soya Protein, Glycine Max Protein Hydrolysate
Summary
Hydrolysed soy protein is a plant-derived ingredient produced by breaking down whole soybeans into smaller peptides and amino acids through hydrolysis. It is primarily included in pet food for its highly digestible protein content, supporting muscle maintenance and overall health. Rather than using whole soybeans, hydrolysed soy protein is utilised in its processed form to enhance digestibility and reduce allergenic potential.
Why it's used?
Hydrolysed soy protein is included as a cost-effective, highly digestible source of plant-based protein that can help meet nutritional requirements while supporting hypoallergenic or limited-ingredient formulations. Its use also enhances palatability and improves product texture.
Light beige cellulose powder with a fine, soft texture, commonly used as dietary fibre in dog food
Cellulose Powder
Cellulose Powder
Microcrystalline Cellulose, Powdered Cellulose, E460, Cellulosum
Summary
Cellulose powder is a plant-derived ingredient sourced primarily from wood pulp. It serves as an insoluble dietary fibre, supporting digestive health and stool quality in pets. Rather than being used in its raw, fibrous state, cellulose is processed into a fine powder to optimise its functional benefits and ensure safe, consistent inclusion in pet food formulations.
Why it's used?
Cellulose powder is included as a cost-effective fibre source to aid stool quality and promote digestive health. It also functions as a bulk-adding agent, helping to control calorie density in pet food formulations.
Fine off-white dicalcium phosphate powder with a slightly grainy texture, commonly used in dog supplements
Dicalcium Phosphate
Dicalcium Phosphate
Calcium Hydrogen Phosphate, Dibasic Calcium Phosphate, E341(ii), Calcium Phosphate Dibasic
Summary
Dicalcium phosphate is a mineral compound derived from calcium and phosphorus, commonly sourced from phosphate rock. It serves as a key dietary supplement in pet foods, providing essential calcium and phosphorus to support healthy bones and teeth. Dicalcium phosphate is not used in its natural raw or metallic state; instead, it is utilised in its purified compound form to ensure safety and optimal absorption.
Why it's used?
Dicalcium phosphate is included as a cost-effective mineral supplement to provide essential calcium and phosphorus for skeletal health. It also serves as a functional agent to improve product texture and processing stability.
Golden yellow drop of soybean oil with a smooth, glossy texture on a white background
Soybean Oil
Soybean Oil
Glycine Max Oil, E322, Soya Oil, Soya Bean Oil
Summary
Soybean oil is a plant-derived oil extracted from the seeds of the soybean (Glycine max). It serves as a concentrated source of energy and provides essential fatty acids, particularly linoleic acid, which supports skin and coat health in pets. Soybean oil is utilised in its refined liquid form, not as whole soybeans, to optimise digestibility and nutrient availability in pet food formulations.
Why it's used?
Soybean oil is included as a cost-effective source of fat and essential fatty acids, supporting energy density and skin and coat health in pet food. It also contributes to product texture and palatability while helping to optimise manufacturing costs.
Light brown, fine powder texture of hydrolysed chicken flavour, a common dog food ingredient in Australia
Hydrolysed Chicken Flavour
Hydrolysed Chicken Flavour
Hydrolysed Chicken Extract, Hydrolysed Chicken Protein, Hydrolysed Gallus Gallus Domesticus Flavour, Hydrolysed Poultry Flavour
Summary
Hydrolysed chicken flavour is a functional ingredient derived from animal sources, specifically chicken proteins that have been broken down into smaller peptides through hydrolysis. Its primary purpose is to enhance palatability, making pet food more appealing. This ingredient is not used in its natural whole form; instead, it is utilised as a hydrolysed compound to optimise digestibility and reduce allergenic potential.
Why it's used?
Hydrolysed chicken flavour is included as a palatability enhancer to improve the taste and aroma of the product, encouraging dogs to consume the food. It also allows manufacturers to label the product as containing chicken-derived ingredients without significantly increasing production costs.
Ground pecan shell displayed as fine, light brown granules with a coarse, gritty texture suitable for dog food
Ground Pecan Shell
Ground Pecan Shell
Pecan Shell Powder, Carya Illinoinensis Shell, Pecan Husk Powder, Pecan Shell Fibre
Summary
Ground pecan shell is a plant-derived ingredient sourced from the outer shell of pecan nuts. It is primarily included in pet food as a natural fibre source to support digestive health and promote regular bowel movements. Ground pecan shell is used in its natural, finely milled form, providing a safe and effective means of increasing dietary fibre content in premium pet food formulations.
Why it's used?
Ground pecan shell is included as a cost-effective fibre source to aid in stool quality and provide bulk to the product. It may also serve as a natural abrasive to support dental health in some formulations.
White, fluffy scoop of solid coconut oil with creamy texture, ideal for dog health and nutrition in Australia
Coconut Oil
Coconut Oil
Cocos Nucifera Oil, Copra Oil, E472c, Coconut Fat
Summary
Coconut oil is a plant-derived oil extracted from the flesh of mature coconuts. It is primarily included in pet food for its energy-dense medium-chain triglycerides, which support healthy skin, coat, and metabolism. Coconut oil is used in its natural, refined form, ensuring it is safe and readily digestible for pets while delivering its functional nutritional benefits.
Why it's used?
Coconut oil is included as a source of medium-chain triglycerides, which are marketed for their potential health benefits and digestibility. It also serves as a label-friendly ingredient that appeals to consumers seeking natural or premium pet food formulations.
Fine white lactic acid powder with a slightly grainy texture, displayed in a circular mound on a plain background
Lactic Acid
Lactic Acid
2-Hydroxypropanoic Acid, E270, DL-Lactic Acid, L(+)-Lactic Acid
Summary
Lactic acid is an organic compound of microbial origin, commonly produced through the fermentation of carbohydrates. It is primarily included in pet food as a preservative and acidifier, helping to inhibit the growth of harmful bacteria and maintain product freshness. Lactic acid is not used in its natural, raw state but is instead utilised in a purified, food-grade form to ensure safety and effective absorption.
Why it's used?
Lactic acid is included as a preservative to inhibit microbial growth and extend the product’s shelf life. It may also be used to enhance palatability by providing a mildly tangy flavour that appeals to pets.
Fine off-white powder form of potassium chloride, a common dietary supplement for dogs
Potassium Chloride
Potassium Chloride
E508, Muriate of Potash, Potassium Monochloride, KCl
Summary
Potassium chloride is a mineral compound derived from the element potassium, typically sourced from naturally occurring mineral deposits. It is utilised in pet food as a purified salt rather than in its raw metallic form, ensuring safety and optimal absorption. Its primary purpose is to provide essential potassium, which supports nerve function, muscle contraction, and fluid balance in companion animals.
Why it's used?
Potassium chloride is included as a cost-effective mineral supplement to help meet pets’ dietary potassium requirements. It also functions as a salt substitute to optimise electrolyte balance in the formulation.
Brown linseed seeds with a glossy, smooth surface and oval shape, piled together on a white background
Linseed
Linseed
Flaxseed, Linum Usitatissimum, Flax, Flaxseed Oil
Summary
Linseed, also known as flaxseed, is a plant-derived ingredient sourced from the seeds of the flax plant (Linum usitatissimum). It is primarily included in pet food for its high content of omega-3 fatty acids and dietary fibre, supporting skin health and digestion. Linseed is used in its natural, whole or ground form to optimise nutrient availability and functional benefits.
Why it's used?
Linseed is included as a source of omega-3 fatty acids and dietary fibre, supporting skin and coat health as well as digestive function. Its presence also allows manufacturers to market the product as containing plant-based nutrients and functional ingredients.
Fine white powder texture of glycerol monostearate, a common dog food ingredient, shown in close-up detail
Glycerol Monostearate
Glycerol Monostearate
Monostearin, Glyceryl Stearate, E471, 1-Monostearoyl Glycerol
Summary
Glycerol monostearate is a compound derived from the esterification of glycerol (a plant or animal-based alcohol) and stearic acid (a fatty acid). It serves primarily as an emulsifier, helping to blend fats and water in pet food for improved texture and stability. Glycerol monostearate is not used in its natural raw form but is specifically utilised as a processed compound to optimise safety and functionality.
Why it's used?
Glycerol monostearate is included as an emulsifier to improve texture and maintain the stability of fats within the pet food, preventing separation during processing and storage. It may also contribute to extending shelf life by helping to retain moisture and inhibit staleness.
Light brown, fibrous dried beet pulp in a loose, shredded pile, showing rough texture as a dog food ingredient
Dried Beet Pulp
Dried Beet Pulp
Beet Fibre, Beet Fiber, Beta Vulgaris Pulp, Beta Vulgaris Fibre
Summary
Dried beet pulp is a fibrous by-product derived from sugar beet plants after sugar extraction. As a plant-based ingredient, it serves primarily as a source of fermentable fibre, supporting digestive health and stool quality in pets. Dried beet pulp is used in its processed, dried form rather than as fresh beet, optimising its digestibility and functional benefits in pet food formulations.
Why it's used?
Dried beet pulp is included as a cost-effective source of dietary fibre to promote digestive health and stool quality in pets. It also serves as a bulk-adding agent, helping to optimise the texture and consistency of the final product.
Light brown dried citrus pulp in a loose, crumbly pile with a coarse texture, ideal as a dog food ingredient
Dried Citrus Pulp
Dried Citrus Pulp
Citrus Pulp, Citrus Pulp Meal, Citrus Residue, Citrus Spp. Pulp
Summary
Dried citrus pulp is a plant-derived ingredient produced from the residual pulp of citrus fruits after juice extraction. It serves primarily as a source of dietary fibre and fermentable carbohydrates, supporting digestive health and beneficial gut bacteria in pets. Dried citrus pulp is utilised in its processed, dried form rather than as fresh fruit, ensuring stability, palatability, and consistent nutrient content in pet food formulations.
Why it's used?
Dried citrus pulp is included as a cost-effective source of dietary fibre and energy, supporting digestive health and stool quality. It also serves as a bulk-adding agent, helping to optimise production costs while maintaining product texture.
Fine white methionine powder with a soft, slightly textured surface, commonly used as a dog supplement ingredient
Methionine
Methionine
L-Methionine, 2-Amino-4-(Methylthio)butyric Acid, E620, L-2-Amino-4-(Methylthio)butyric Acid
Summary
Methionine is an essential amino acid derived from animal or plant sources, crucial for protein synthesis and overall metabolic health in pets. It primarily supports healthy skin, coat, and liver function. Methionine is not used in its raw elemental form; instead, it is incorporated as a specific compound, such as DL-methionine, to optimise safety, stability, and bioavailability in pet food formulations.
Why it's used?
Methionine is included as an essential amino acid to support protein synthesis and overall health in pets, particularly when animal protein sources are limited or variable. It also serves as a cost-effective way to meet nutritional requirements and optimise the amino acid profile of the final product.
Golden yellow fish oil droplet with a glossy, smooth texture on a white background, highlighting its purity and quality
Fish Oil
Fish Oil
Fish Liver Oil, Oleum Piscis, Oleum Jecoris, Oleum Piscarium
Summary
Fish oil is a nutrient-rich oil derived from the tissues of oily fish, making it an animal-based ingredient. It is primarily included in pet food for its high content of omega-3 fatty acids, which support skin, coat, and joint health. Fish oil is utilised in a purified, liquid form rather than as whole fish, ensuring optimal absorption and safety for pets.
Why it's used?
Fish oil is included as a source of omega-3 fatty acids to support skin, coat, and joint health, enhancing the nutritional profile of the product. Its presence also serves as a marketing point, appealing to consumers seeking functional health benefits for their pets.
Fine, off-white choline chloride powder with a slightly grainy texture, commonly used in dog supplements
Choline Chloride
Choline Chloride
Trimethylethanolamine Chloride, Choline Monochloride, E1001, 2-Hydroxy-N,N,N-Trimethylethanaminium Chloride
Summary
Choline chloride is a synthetic compound derived from choline, an essential nutrient typically sourced from plant or animal origins. It is primarily included in pet food to support healthy brain function, liver metabolism, and cellular structure. Choline is not used in its natural state; instead, it is utilised as choline chloride to ensure stability, safety, and optimal absorption in pet diets.
Why it's used?
Choline chloride is included as an essential nutrient to support normal liver function and brain health in pets. It is a cost-effective way to meet regulatory requirements for choline content in complete and balanced pet foods.
Fine off-white calcium sulphate powder with a soft, slightly grainy texture, suitable for dog supplements
Calcium Sulphate
Calcium Sulphate
Gypsum, E516, Anhydrite, Dihydrate Gypsum
Summary
Calcium sulphate is a mineral-derived compound commonly included in pet food formulations. Sourced from naturally occurring gypsum, it is not used in its raw mineral state but is instead utilised as a purified, food-grade compound. Its primary purpose is to provide a bioavailable source of calcium, supporting healthy bone development and maintenance in pets, while also serving as a firming agent in some recipes.
Why it's used?
Calcium sulphate is included as a cost-effective source of calcium to support nutritional balance and bone health in pet food formulations. It also functions as a firming agent, helping to optimise texture and product stability.
Pressed cranberry powder in a deep red, fine, slightly grainy mound on a plain background
Pressed Cranberry
Pressed Cranberry
Cranberry Juice, Vaccinium Macrocarpon Juice, Vaccinium Macrocarpon Extract, Cranberry Extract
Summary
Pressed cranberry is a fruit ingredient derived from whole cranberries, a plant source known for their rich antioxidant content. It is included in pet food primarily to support urinary tract health and provide natural antioxidants. Pressed cranberry is used in its natural, whole-food form, ensuring pets benefit from its full spectrum of nutrients and bioactive compounds.
Why it's used?
Pressed cranberry is included as a natural source of antioxidants and to enhance the product’s marketing appeal by highlighting fruit content. It may also contribute to urinary tract health claims, supporting a premium positioning in the pet food market.
Fine, pale yellow Vitamin E powder with a soft, slightly grainy texture, commonly used in dog supplements
Vitamin E
Vitamin E
Tocopherol, Alpha-Tocopherol, E307, D-Alpha-Tocopherol
Summary
Vitamin E is a fat-soluble vitamin derived from plant sources such as vegetable oils, nuts, and seeds. It functions primarily as an antioxidant, helping to protect cell membranes from oxidative damage and supporting immune health. In pet food, Vitamin E is not used in its natural raw form but is typically utilised as a stabilised compound, such as tocopherol acetate, to optimise safety and absorption.
Why it's used?
Vitamin E is included as a natural antioxidant to help preserve the freshness and stability of fats and oils in the product, thereby extending shelf life. It also serves as a label-friendly nutrient that appeals to consumers seeking added health benefits for their pets.
Fine white powder texture of ascorbyl polyphosphate, a vitamin C supplement ingredient for dog health products
Ascorbyl Polyphosphate
Ascorbyl Polyphosphate
L-Ascorbyl Polyphosphate, Ascorbic Acid Polyphosphate, Polyphosphate Ester of Ascorbic Acid, E304
Summary
Ascorbyl polyphosphate is a synthesised compound derived from vitamin C (ascorbic acid), typically of plant origin. It serves as a stable source of vitamin C, supporting immune function and acting as an antioxidant in pet food. Ascorbyl polyphosphate is not used in its natural form; instead, it is utilised as a phosphate-bound compound to optimise stability and bioavailability.
Why it's used?
Ascorbyl polyphosphate is included as a stable, cost-effective source of vitamin C that resists degradation during processing and storage. Its use helps manufacturers ensure consistent nutrient labelling and extend the shelf life of the finished product.
Fine white niacin powder with a slightly grainy texture, arranged in a circular mound on a plain background
Niacin
Niacin
Nicotinic Acid, Vitamin B3, Pyridine-3-Carboxylic Acid, E375
Summary
Niacin, also known as vitamin B3, is a water-soluble vitamin of synthetic or natural origin, commonly derived from plant or animal sources. It plays a crucial role in energy metabolism and supports healthy skin, nerves, and digestion in pets. Niacin is not used in its raw form but is typically included as a safe, bioavailable compound such as niacinamide or nicotinic acid.
Why it's used?
Niacin is included as an essential B vitamin to meet nutritional requirements and support metabolic health in pets. Its addition ensures compliance with regulatory standards for complete and balanced pet food labelling.
Fine white powder with a slightly grainy texture, thiamine mononitrate used in dog supplements on a plain background
Thiamine Mononitrate
Thiamine Mononitrate
Vitamin B1 Mononitrate, Nitrate Salt of Thiamine, E101a, Thiamin Mononitrate
Summary
Thiamine mononitrate is a synthetic, water-soluble form of vitamin B1, derived from chemical synthesis rather than natural sources. It is added to pet food to support energy metabolism and proper nervous system function. Thiamine is not used in its natural state; instead, the mononitrate compound is utilised for stability, safety, and optimal absorption in formulated diets.
Why it's used?
Thiamine mononitrate is included as a stable, cost-effective source of vitamin B1 to meet nutritional requirements and ensure product labelling compliance. Its synthetic form maintains potency during processing and storage, supporting both product stability and regulatory standards.
Fine white powder texture of pyridoxine hydrochloride, a dog supplement ingredient, shown in close-up detail
Pyridoxine Hydrochloride
Pyridoxine Hydrochloride
Vitamin B6, E300, Pyridoxine HCl, Pyridoxine Monohydrochloride
Summary
Pyridoxine hydrochloride is a synthetic, water-soluble form of vitamin B6, derived from chemical synthesis rather than natural sources. It is added to pet foods to support protein metabolism, nervous system health, and immune function. Unlike naturally occurring vitamin B6 in foods, pyridoxine is utilised in its hydrochloride salt form to ensure stability, safety, and optimal absorption in companion animals.
Why it's used?
Pyridoxine hydrochloride is included as a cost-effective, stable source of vitamin B6 to ensure nutritional adequacy and meet regulatory labelling requirements. Its addition helps manufacturers guarantee consistent vitamin content throughout the product’s shelf life.
Fine off-white powder texture of calcium pantothenate, a common supplement ingredient for dogs
Calcium Pantothenate
Calcium Pantothenate
D-Calcium Pantothenate, E315, Pantothenic Acid Calcium Salt, Calcium D-Pantothenate
Summary
Calcium pantothenate is a synthetic compound derived from pantothenic acid, a water-soluble B vitamin (vitamin B5) of plant or animal origin. It is primarily included in pet food to support energy metabolism and maintain healthy skin and coat. Rather than using pantothenic acid in its natural form, calcium pantothenate is utilised for its stability, safety, and enhanced bioavailability in pet nutrition.
Why it's used?
Calcium pantothenate is included as a stable, bioavailable source of vitamin B5 to meet nutritional requirements and support labelling claims of complete and balanced nutrition. Its use ensures consistent vitamin content throughout the product’s shelf life.
Bright yellow riboflavin powder with a fine, slightly grainy texture displayed in a close-up circular view
Riboflavin
Riboflavin
Vitamin B2, E101, Lactoflavin, 7,8-Dimethyl-10-Ribityl Isoalloxazine
Summary
Riboflavin, also known as vitamin B2, is a water-soluble vitamin of synthetic origin commonly added to pet foods. It plays a crucial role in energy metabolism and supports healthy skin, eyes, and nervous system function. Riboflavin is not used in its natural form but is typically utilised as a synthesised compound to ensure stability, safety, and optimal absorption in pet diets.
Why it's used?
Riboflavin is included as an essential vitamin to meet nutritional requirements and ensure regulatory compliance for complete and balanced pet food labelling. Its addition helps optimise the product’s nutrient profile without significantly impacting cost or palatability.
Fine pale yellow powder of Vitamin A with a smooth texture, commonly used as a dog supplement for health and nutrition
Vitamin A
Vitamin A
Retinol, Retinyl Palmitate, Retinyl Acetate, E160a
Summary
Vitamin A is an essential fat-soluble nutrient derived from animal sources (as retinyl esters) or plant sources (as carotenoids). It supports vision, immune function, and skin health in pets. In pet food, Vitamin A is not used in its raw or natural state but is provided as stabilised compounds (such as retinyl acetate or retinyl palmitate) to ensure safety, stability, and optimal absorption.
Why it's used?
Vitamin A is included as an essential nutrient to support vision, immune function, and overall health in pets, ensuring the product meets established nutritional standards. Its addition also allows manufacturers to optimise the nutritional profile and comply with regulatory labelling requirements.
Fine off-white biotin powder with a slightly grainy texture, commonly used as a supplement for dogs
Biotin
Biotin
Vitamin B7, Vitamin H, D-Biotin, Coenzyme R
Summary
Biotin is a water-soluble B-vitamin (vitamin B7) of synthetic origin, commonly included in pet foods to support healthy skin, coat, and metabolic function. Its primary benefit is aiding in the metabolism of fats, proteins, and carbohydrates. Biotin is not used in its natural, free form but is instead utilised as a stable, bioavailable compound to optimise absorption and efficacy in pets.
Why it's used?
Biotin is included as an essential vitamin to support skin, coat, and metabolic health in pets, fulfilling nutritional requirements for complete and balanced diets. Its addition also allows manufacturers to highlight the inclusion of key micronutrients on product labelling, appealing to health-conscious consumers.
Bright pink Vitamin B12 powder in a fine, soft-textured mound on a plain background
Vitamin B12
Vitamin B12
Cobalamin, Cyanocobalamin, Hydroxocobalamin, Methylcobalamin
Summary
Vitamin B12 is a water-soluble vitamin of animal origin, essential for nerve function and red blood cell formation in pets. It is primarily included in pet food to support energy metabolism and overall vitality. Vitamin B12 is not used in its natural, raw form but is instead utilised as a specific compound, such as cyanocobalamin, to ensure stability, safety, and optimal absorption.
Why it's used?
Vitamin B12 is included as an essential nutrient to support metabolic and neurological functions in pets, ensuring the product meets established nutritional standards. Its addition helps manufacturers achieve complete and balanced labelling claims.
Bright yellow folic acid powder with a fine, slightly textured surface, used as a supplement for dogs
Folic Acid
Folic Acid
Pteroylmonoglutamic Acid, Pteroylglutamic Acid, Vitamin B9, E920
Summary
Folic acid is a synthetic form of vitamin B9, originally derived from plant sources but produced for pet food as a stable, bioavailable compound. Its primary purpose is to support cell division, DNA synthesis, and overall growth in pets. Folic acid is not used in its natural state; instead, it is utilised as a manufactured supplement to optimise absorption and efficacy.
Why it's used?
Folic acid is included as a synthetic vitamin to ensure nutritional adequacy and meet regulatory requirements for B-vitamin content in pet food. Its addition helps standardise nutrient levels across batches, supporting consistent product labelling and animal health.
Fine pale yellow Vitamin D3 powder with a smooth, soft texture, commonly used as a supplement for dogs
Vitamin D3
Vitamin D3
Cholecalciferol, Colecalciferol, Calciol, E671
Summary
Vitamin D3, also known as cholecalciferol, is a fat-soluble vitamin of animal origin commonly derived from lanolin or fish oil. It plays a crucial role in regulating calcium and phosphorus metabolism, supporting healthy bone development in pets. Vitamin D3 is not used in its natural form but is instead utilised as a stabilised compound to ensure safety, efficacy, and optimal absorption in pet food formulations.
Why it's used?
Vitamin D3 is included to ensure the finished product meets established nutritional requirements for canine health, supporting bone development and calcium regulation. Its addition allows manufacturers to guarantee consistent vitamin content regardless of natural variation in raw materials.
Fine off-white calcium carbonate powder with a soft, smooth texture, commonly used in dog supplements
Calcium Carbonate
Calcium Carbonate
Chalk, Limestone, E170, Marble Dust
Summary
Calcium carbonate is a naturally occurring mineral compound derived from sources such as limestone or marine shells. It is primarily included in pet food as a source of calcium, essential for healthy bones, teeth, and metabolic functions. Calcium carbonate is not used in its raw mineral state; instead, it is processed into a purified, food-grade compound to optimise safety and bioavailability for pets.
Why it's used?
Calcium carbonate is included as a cost-effective mineral supplement to provide a bioavailable source of calcium, supporting bone health and proper nutritional balance. It also functions as a pH stabiliser, contributing to product consistency and shelf stability.
Fine white iodised salt granules in a smooth, powdery pile on a plain background
Iodised Salt
Iodised Salt
Iodized Salt, Iodate Salt, Iodised Sodium Chloride, Iodised Table Salt
Summary
Iodised salt is a mineral-based ingredient produced by adding iodine, an essential trace element, to refined table salt. Sourced from mineral deposits, its primary purpose is to provide dietary sodium and ensure adequate iodine intake, supporting thyroid function and metabolic health. Iodised salt is not used in its natural raw form; instead, it is utilised as a fortified compound to optimise safety and bioavailability.
Why it's used?
Iodised salt is included as a cost-effective source of essential sodium and iodine, supporting pet health and meeting nutritional requirements. It also acts as a flavour enhancer to improve palatability.
Fine white taurine powder with a soft, fluffy texture, commonly used as a supplement for dogs
Taurine
Taurine
2-Aminoethanesulphonic Acid, L-Taurine, E107, 2-Aminoethane-1-Sulphonic Acid
Summary
Taurine is a naturally occurring amino sulfonic acid derived from animal sources, particularly meat and fish. It is added to pet food to support cardiovascular health, vision, and proper immune function, especially in cats who cannot synthesise it sufficiently. Taurine is not used in its raw form; instead, it is incorporated as a purified, synthesised compound to ensure stability, safety, and optimal absorption.
Why it's used?
Taurine is included to ensure adequate levels of this essential amino acid, particularly in diets where animal protein content may be insufficient to meet canine or feline nutritional requirements. Its addition supports cardiovascular health and is often used to address consumer concerns about diet-associated heart issues.
Fine white powder texture of magnesium oxide, a common dog supplement for health and wellbeing
Magnesium Oxide
Magnesium Oxide
Magnesia, E530, Magnesium(II) Oxide, Calcined Magnesia
Summary
Magnesium oxide is an inorganic compound derived from the mineral magnesium, typically sourced from natural deposits. It is utilised in pet food as a supplemental source of magnesium, an essential mineral that supports nerve, muscle, and bone health. Rather than its raw metallic form, magnesium is provided as magnesium oxide to optimise safety, stability, and bioavailability for pets.
Why it's used?
Magnesium oxide is included as a cost-effective mineral supplement to ensure adequate magnesium levels in the diet, supporting essential metabolic functions. Its use allows manufacturers to meet nutritional requirements efficiently without significantly impacting product cost or palatability.
Pale grey ferrous sulphate powder with a fine, slightly clumpy texture, commonly used in dog supplements
Ferrous Sulphate
Ferrous Sulphate
Iron(II) Sulphate, Ferrous Iron Sulphate, E172, Green Vitriol
Summary
Ferrous sulphate is an inorganic compound derived from iron, an essential mineral for animal health. It is primarily included in pet food to support normal red blood cell formation and prevent iron deficiency anaemia. Ferrous sulphate is not used in its natural metallic state; instead, it is utilised as a salt to optimise safety, stability, and absorption within the animal’s body.
Why it's used?
Ferrous sulphate is included as a cost-effective source of dietary iron to meet nutritional requirements in pet food formulations. It helps ensure the product delivers essential minerals for pet health while maintaining compliance with labelling standards.
Fine white powder texture of zinc oxide, commonly used in Australian dog supplements and skin care products
Zinc Oxide
Zinc Oxide
Zinc White, CI 77947, Calamine, Chinese White
Summary
Zinc oxide is an inorganic compound derived from the mineral zinc, commonly used in pet food as a supplemental source of the essential trace mineral zinc. Its primary benefit is to support immune function, skin health, and enzyme activity. Zinc is not used in its natural metallic state; instead, it is utilised as zinc oxide to optimise safety, stability, and bioavailability in pet nutrition.
Why it's used?
Zinc oxide is included as a cost-effective and stable source of essential zinc, supporting nutritional adequacy in pet food formulations. Its use ensures compliance with regulatory requirements for trace minerals while maintaining product shelf stability.
Bright blue copper sulphate powder with a fine, slightly clumpy texture, commonly used as a mineral supplement for dogs
Copper Sulphate
Copper Sulphate
Cupric Sulphate, Blue Vitriol, Roman Vitriol, E519
Summary
Copper sulphate is an inorganic compound derived from copper, an essential trace mineral. It is primarily included in pet food to support vital physiological functions such as enzyme activity, immune health, and connective tissue formation. Copper sulphate is not used in its natural metallic state; instead, it is utilised as a salt to optimise safety, stability, and bioavailability for animal nutrition.
Why it's used?
Copper sulphate is included as a cost-effective and reliable source of essential copper, a trace mineral necessary for canine health. Its use ensures precise nutrient formulation and supports compliance with nutritional labelling standards.
Light grey manganous oxide powder with a fine, slightly grainy texture shown in a close-up circular view
Manganous Oxide
Manganous Oxide
Manganese(II) Oxide, Manganese Monoxide, E172, Manganese Oxide
Summary
Manganous oxide is an inorganic compound derived from the mineral form of manganese, an essential trace element. It is included in pet food primarily as a source of manganese, which supports bone development, metabolism, and antioxidant function. Manganous oxide is not used in its natural metallic state; instead, it is utilised as a safe, bioavailable compound to optimise absorption and nutritional benefit.
Why it's used?
Manganous oxide is included as a cost-effective source of manganese, an essential trace mineral that supports metabolic and skeletal functions in pets. Its stable form allows for consistent nutrient delivery throughout the product’s shelf life.
Fine off-white calcium iodate powder with a soft, slightly grainy texture, commonly used in dog health supplements
Calcium Iodate
Calcium Iodate
Calcium Diiodate, E917, Ca(IO3)2, Calcium Iodate Anhydrous
Summary
Calcium iodate is a mineral-derived compound commonly included in pet foods as a source of iodine, an essential trace element. It is not used in its natural, raw mineral state; instead, it is utilised in the form of a stable, food-grade compound to ensure safety and optimal absorption. Its primary purpose is to support healthy thyroid function and metabolic processes.
Why it's used?
Calcium iodate is included as a stable, bioavailable source of iodine to support thyroid function and overall metabolic health in pets. Its use ensures consistent iodine content throughout the product, optimising nutritional labelling and regulatory compliance.
Fine, off-white powder texture of sodium selenite, a common supplement ingredient for dogs
Sodium Selenite
Sodium Selenite
Disodium Selenite, E901, Selenious Acid Disodium Salt, Disodium Selenious Acid
Summary
Sodium selenite is an inorganic compound derived from selenium, an essential trace mineral. It is included in pet food formulations to provide a bioavailable source of selenium, which supports antioxidant defence and immune function. Sodium selenite is not used in its natural elemental form; instead, it is utilised as a salt compound to ensure safety, stability, and optimal absorption in pets.
Why it's used?
Sodium selenite is included as a cost-effective and stable source of the essential trace mineral selenium, which supports normal metabolic and immune functions in pets. Its use allows manufacturers to meet nutritional requirements efficiently and with consistent quality.
Fine white tryptophan powder with a soft, slightly textured surface, commonly used as a dog supplement ingredient
Tryptophan
Tryptophan
L-Tryptophan, L-α-Aminoindole-3-Propionic Acid, 2-Amino-3-(Indol-3-yl)Propanoic Acid, EAA 10
Summary
Tryptophan is an essential amino acid derived from animal or plant protein sources. It plays a crucial role in pet nutrition by supporting protein synthesis and serving as a precursor for serotonin, which influences mood and behaviour. Tryptophan is not used in its isolated, natural form but is instead incorporated as a purified amino acid to optimise dietary balance and bioavailability in pet food formulations.
Why it's used?
Tryptophan is included as an essential amino acid to support complete and balanced nutrition, meeting regulatory requirements for canine dietary adequacy. Its addition ensures the product can be marketed as providing all necessary amino acids for dogs’ health.
Amber-brown liquid drop of mixed tocopherols with a glossy, smooth texture on a white background
Mixed Tocopherols
Mixed Tocopherols
Tocopherols, E306, Natural Tocopherols Concentrate, D-Alpha Tocopherol Concentrate
Summary
Mixed tocopherols are a blend of compounds derived from plant oils, primarily functioning as a source of vitamin E. Their main purpose in pet food is to act as natural antioxidants, helping to preserve the freshness of fats and oils. Rather than being used in their isolated, pure form, mixed tocopherols are incorporated as stabilised extracts to optimise safety, efficacy, and nutrient retention.
Why it's used?
Mixed tocopherols are included as a natural preservative to extend shelf life by slowing the oxidation of fats and oils in pet food. They are often used as a label-friendly alternative to synthetic preservatives to appeal to consumer preferences for natural ingredients.
Too vague to identify
Natural Flavour
Natural Flavour
Natural Flavouring, Flavouring Substance, Flavouring Preparation, Flavouring Complex
Summary
Natural flavour is a food additive derived from animal or plant sources, designed to enhance the palatability of pet food. Its primary purpose is to improve taste and encourage consistent consumption. Rather than being used in its original raw form, natural flavour is typically processed and concentrated to ensure safety, stability, and uniformity in pet food formulations, while maintaining its natural origin.
Why it's used?
Natural flavour is included to enhance palatability, encouraging pets to consume the product. It also allows manufacturers to improve taste without specifying individual flavouring agents, supporting flexible formulation and label-friendly marketing.
Fine white powder texture of carnitine, a popular dog supplement ingredient for health and vitality
Carnitine
Carnitine
L-Carnitine, Levocarnitine, Vitamin Bt, E306
Summary
Carnitine is a naturally occurring compound derived from animal sources, primarily meat and fish. It plays a crucial role in energy metabolism by transporting fatty acids into the mitochondria for cellular energy production. In pet food, carnitine is utilised in a synthesised, bioavailable form rather than its raw state, ensuring optimal absorption and safety for companion animals.
Why it's used?
Carnitine is included as a functional ingredient to support fat metabolism and energy production, particularly in formulas targeting active or senior pets. Its addition allows manufacturers to market the product as supporting heart health and weight management.
Bright orange, finely textured beta carotene powder in a close-up circular view for dog health supplements
Beta Carotene
Beta Carotene
Provitamin A, E160a, All-Trans-Beta-Carotene, CI 40800
Summary
Beta carotene is a plant-derived pigment and precursor to vitamin A, commonly sourced from carrots and other colourful vegetables. Its primary nutritional benefit is supporting vision, immune function, and antioxidant defence. In pet food, beta carotene is utilised in its extracted or purified form rather than as whole vegetables, ensuring consistent potency and bioavailability for optimal health outcomes.
Why it's used?
Beta carotene is included as a natural source of vitamin A and as a colour-enhancing agent to improve the visual appeal of the product. Its presence also allows for label-friendly marketing, appealing to consumers seeking natural additives.

About

Brand
Hill's Prescription Diet
Company
Hill's Pet Nutrition
Manufactured
United States
Type
Kibble
Life Stage
Adult, Senior
Breed Size
All Breeds
Feeding Type
Complete Meal
Processing Level
High

Product Tags

Single Protein
Gluten Free
Dairy Free

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About the Brand

Hill's Prescription Diet

Hill's Prescription Diet is a veterinary-therapeutic food line from Hill's Pet Nutrition, originating in 1948. Formulas are designed to nutritionally manage specific clinical conditions such as kidney disease, allergies, and diabetes.

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