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Ingredient file // Flavor

Hydrolyzed Yeast

A flavor lift with thin health evidence

Hydrolyzed yeast is yeast broken apart to release its cell contents while keeping the cell walls. It adds savory flavor to dog food. A short dog trial found changes in fecal bacteria, but showed no health benefit.

Role in the food Does a job
What it is
Dried yeast whose cells have been broken down, leaving cell contents and wall fragments together.
Made from
Yeast grown for fermentation
Main job
Savory flavor
Typical amount
Not published
Watch for
Liver enzyme rises in one dog trial
Not the same as
Yeast extract or live yeast

Straight answer

Is Hydrolyzed Yeast safe for dogs?

Read it as flavor, then check the recipe

If hydrolyzed yeast sits low on the ingredient list, treat it as a small flavor addition. Look above it for the foods supplying most of the protein and calories. Its presence does not make a food healthier, and the immune and gut claims need better dog trials.

Why it is in the food
Savory flavor

Our read // In our catalog

In 1 of every 22 foods we track

Share of foods that list it

5%

148 of the 3,204 foods with an ingredient list on file, from 11 brands. 116 dry dog food, 28 wet dog food, 2 dog treats.

Each square is 1% of the catalog

Where it sits on the label

Median position 21. In the top five of 1 food, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

18%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 82% of foods.

Price per lb

Foods with it $3.32
All foods $3.25

Median of the cheapest bag price across 102 priced foods, about level with the catalog. The price is the food's, not the ingredient's.

Who leans on it

34%

of the foods that list it are from Royal Canin. 11 brands use it in total.

What it is

How it is made

Brewing and food fermentation produce yeast cells that remain after the main product is removed. Feed processors collect the cells, break them down with enzymes, and dry the mixture for use in food.3,5,8

  1. 01 // Source Yeast cells Brewing or other food fermentation supplies yeast biomass for processing.
  2. 02 // Process Cells collected The yeast is separated from liquid before further processing.
  3. 03 // Process Cells hydrolyzed Added enzymes break open the cells and cut some proteins into smaller pieces.
  4. 04 // Output Dried hydrolysate The dried ingredient contains cell contents and wall material; yeast extract has the walls separated out.

What is in it

Composition, dry matter

46

% protein

Crude protein in one tested hydrolyzed brewer's yeast. A small addition contributes little protein to the finished food.

Crude protein 463.1 g/kg3
Starch 225.2 g/kg3
Beta glucan 90.4 g/kg3

These rows describe one hydrolyzed brewer's yeast. Another commercial yeast hydrolysate tested at 53.06% protein, so the ingredient name alone cannot tell you the composition of a supplier's batch.3,4

Why it is in the bag

There for savory flavor, not for nutrition

  1. Main nutrition
  2. Supporting nutrient
  3. Does a job
  4. Mostly filler

Makers add hydrolyzed yeast for flavor. Yeast products contain glutamic acid and nucleotides, which probably intensify savory taste, and dogs generally accept yeast products well. In many foods it sits low on the list, and lists run by weight, so it is likely too little to change the food's protein or calories. Its gut and immune claims have not been shown to matter for dogs at the amounts foods use.1,5,7

  1. 01

    Adds savory flavor

    Breaking cells releases savory yeast compounds. In an industry preference test, dogs ate more kibble coated with hydrolyzed yeast than kibble coated with inactive yeast.5,8

  2. 02

    Supplies yeast compounds

    The hydrolysate retains cell wall beta glucans and mannans alongside cell contents. Manufacturers market that mixture for gut and immune effects, though direct dog evidence is limited.1,5

  3. 03

    Uses surplus yeast

    Breweries produce spent yeast in large quantities. Selling it for feed gives that stream another use, while separating and drying the wet yeast add processing work.3

How much A controlled dog study fed 0.3% hydrolyzed yeast; an industry preference test applied it as a 0.5% kibble coating.1,8

Our read // The claims

What the evidence supports

Strong: controlled studies in dogs agree. Some: small or mixed dog data. Thin: mechanism or lab work only. None: nothing, or the evidence points the other way.

  1. Brands say

    Hydrolyzed yeast makes kibble more appetizing

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    In a manufacturer-run test, dogs preferred kibble with a 0.5% hydrolyzed yeast coating over inactive yeast. A separate 16-dog test favored yeast extract, a different product. Those results do not guarantee preference for every hydrolysate.2,5,8

  2. Brands say

    Hydrolyzed yeast improves a dog's gut bacteria

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    In a 20-dog trial, 0.3% hydrolyzed yeast increased fecal bifidobacteria, but clostridia also increased later. The researchers measured bacterial counts, not better digestion or fewer illnesses. Calling the shift an improvement goes too far.1

  3. Brands say

    Hydrolysis makes yeast protein easier to absorb

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    Enzymes produce smaller protein pieces, but no dog study compared absorption from intact and hydrolyzed yeast. A trout study found no improvement in protein digestibility after hydrolysis. Smaller pieces alone do not prove better absorption.3,5

  4. Brands say

    Hydrolyzed yeast boosts a dog's immune defenses

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    The 20-dog hydrolysate trial found no change in measured immune-cell groups or phagocyte activity. It did not test resistance to illness. Findings from other yeast products do not prove protection from this ingredient.1,5

  5. Owners say

    Eating this yeast causes yeast infections

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    Hydrolyzed yeast contains broken cells, not a live yeast culture. A 20-dog feeding trial reported blood and fecal measures, not skin infections. UC Davis describes skin yeast infections as secondary effects of allergic inflammation.1,5,6

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    It adds flavor and carries yeast cell contents and wall material. Those are real jobs, though the small amounts tested in dog food make it a minor protein contributor. Judge health promises separately from its flavor use.1,3,5,8

  2. Q02

    Is it a live probiotic?

    No

    Hydrolysis breaks yeast cells apart. A live yeast probiotic contains viable cells, while this ingredient contains their contents and wall fragments. Results from live yeast studies do not transfer to hydrolyzed yeast.5

  3. Q03

    Does it count as protein?

    A little

    One tested hydrolyzed brewer's yeast was about 46% crude protein on a dry matter basis. That describes the ingredient, not its share of the bag. The finished food's protein depends on the whole recipe.3,7

  4. Q04

    Will it cause yeast infections?

    No evidence

    Eating processed yeast is not known to seed a skin or ear infection. Allergic skin inflammation can lead to a secondary yeast infection, which calls for its own diagnosis and treatment.5,6

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Royal Canin 51 / 160
  2. NutriSource 34 / 91
  3. Victor 21 / 26
  4. Horizon 11 / 27
  5. Evanger's 10 / 30
  6. Wellness 8 / 118
  7. Blue 5 / 186
  8. Eukanuba 4 / 35
  9. Go! Solutions 2 / 46
  10. Blue Seal 1 / 19

Foods that list it / all the brand's recipes we track.

Plus 1 more brand.

Amazon best sellers that list it

  1. #75 Royal Canin Small Puppy Dry Dog Food
  2. #80 Royal Canin Yorkshire Terrier Adult Dry Dog Food

Rank on Amazon's dog food best seller list, checked October 2026.

Usually listed with, share of the foods that list it

  1. Chicken Fat 58%
  2. Natural Flavor 57%
  3. Dried Plain Beet Pulp 44%
  4. Brewers Rice 37%
  5. Chicken By-Product Meal 34%
  6. Wheat Gluten 31%
  7. Corn 28%
  8. Brown Rice 27%
  9. Chicken 26%
  10. Mixed Tocopherols 24%
  11. Chicken Meal 22%
  12. Fish Oil 21%

On the shelf

Foods that list Hydrolyzed Yeast

148 foods in our catalog list it. These 60 list it highest on the label.

Evanger’s EVX Restricted Diet: Weight Management Wet Dog FoodEvanger'sEvanger’s EVX Restricted Diet: Weight Management Wet Dog FoodWet // No. 5 on the labelEvanger’s Super Premium EVX Restricted Diet: Skin & Coat Wet Dog FoodEvanger'sEvanger’s Super Premium EVX Restricted Diet: Skin & Coat Wet Dog FoodWet // No. 6 on the labelHorizon Taiga XL - Dry Dog FoodHorizonHorizon Taiga XL - Dry Dog FoodDry // No. 6 on the labelRoyal Canin Large Puppy Thin Slices in Gravy Wet Dog FoodRoyal CaninRoyal Canin Large Puppy Thin Slices in Gravy Wet Dog FoodWet // No. 14 on the labelWellness Complete Health Grain Sensitive Skin & Stomach Salmon & Rice Dry Dog FoodWellnessWellness Complete Health Grain Sensitive Skin & Stomach Salmon & Rice Dry Dog FoodDry // No. 14 on the labelWellness CORE+ Wholesome Grains Sensitive Skin Stomach Salmon & Rice Dry Dog FoodWellnessWellness CORE+ Wholesome Grains Sensitive Skin Stomach Salmon & Rice Dry Dog FoodDry // No. 14 on the labelWellness Core Bowl Boosters Functional Toppers Digestive Health Dog Food TopperWellnessWellness Core Bowl Boosters Functional Toppers Digestive Health Dog Food TopperTopper // No. 14 on the labelRoyal Canin Starter Mother & Babydog Ultra Soft Mousse In Sauce Wet Dog FoodRoyal CaninRoyal Canin Starter Mother & Babydog Ultra Soft Mousse In Sauce Wet Dog FoodWet // No. 15 on the labelNutriSource Chicken Formula Grain-Free Wet Dog FoodNutriSourceNutriSource Chicken Formula Grain-Free Wet Dog FoodWet // No. 15 on the labelBlue Seal Entrust Active Chicken Meal & Barley Recipe Dry Dog FoodBlue SealBlue Seal Entrust Active Chicken Meal & Barley Recipe Dry Dog FoodDry // No. 15 on the labelHorizon Pulsar Grain-Free Salmon Formula Dry Dog FoodHorizonHorizon Pulsar Grain-Free Salmon Formula Dry Dog FoodDry // No. 15 on the labelBlue True Solutions Large Breed Care Chicken & Oatmeal Recipe Dry Dog FoodBlueBlue True Solutions Large Breed Care Chicken & Oatmeal Recipe Dry Dog FoodDry // No. 16 on the label
Show 48 more
Evanger’s EVX Restricted Diet: Digestion Bland Diet Wet Dog FoodEvanger'sEvanger’s EVX Restricted Diet: Digestion Bland Diet Wet Dog FoodWet // No. 7 on the labelEvanger’s EVX Restricted Diet: Hip & Joint and Senior Support Grain-Free Wet Dog FoodEvanger'sEvanger’s EVX Restricted Diet: Hip & Joint and Senior Support Grain-Free Wet Dog FoodWet // No. 9 on the labelRoyal Canin Size Health Nutrition X-Small Puppy Thin Slices In Gravy Wet Dog FoodRoyal CaninRoyal Canin Size Health Nutrition X-Small Puppy Thin Slices In Gravy Wet Dog FoodWet // No. 15 on the labelRoyal Canin Size Health Nutrition Medium Puppy Thin Slices in Gravy Wet Dog FoodRoyal CaninRoyal Canin Size Health Nutrition Medium Puppy Thin Slices in Gravy Wet Dog FoodWet // No. 15 on the labelWellness CORE Digestive Health Large Breed Chicken & Brown Rice Dry Dog FoodWellnessWellness CORE Digestive Health Large Breed Chicken & Brown Rice Dry Dog FoodDry // No. 15 on the labelEvanger’s EVx Enhanced Diet Skin & Coat Support Salmon Jerky Dog TreatsEvanger'sEvanger’s EVx Enhanced Diet Skin & Coat Support Salmon Jerky Dog TreatsDog Treats // No. 16 on the labelBlue True Solutions Small Breed Care Chicken & Oatmeal Recipe for Small Breed Adult Dogs Dry Dog FoodBlueBlue True Solutions Small Breed Care Chicken & Oatmeal Recipe for Small Breed Adult Dogs Dry Dog FoodDry // No. 16 on the labelWellness Core Digestive Health Whitefish & Brown Rice Dry Dog FoodWellnessWellness Core Digestive Health Whitefish & Brown Rice Dry Dog FoodDry // No. 16 on the labelRoyal Canin Yorkshire Terrier Puppy Dry Dog FoodRoyal CaninRoyal Canin Yorkshire Terrier Puppy Dry Dog FoodDry // No. 16 on the labelNutriSource Trout & Rice Wet Dog FoodNutriSourceNutriSource Trout & Rice Wet Dog FoodWet // No. 17 on the labelNutriSource High Plains Select Wet Dog FoodNutriSourceNutriSource High Plains Select Wet Dog FoodWet // No. 17 on the labelNutriSource Prairie Select Grain-Free Wet Dog FoodNutriSourceNutriSource Prairie Select Grain-Free Wet Dog FoodWet // No. 17 on the labelWellness Core Digestive Health Age Advantage Chicken Brown Rice Dry Dog FoodWellnessWellness Core Digestive Health Age Advantage Chicken Brown Rice Dry Dog FoodDry // No. 17 on the labelWellness Core Digestive Health Small Breed Chicken & Brown Rice Dry Dog FoodWellnessWellness Core Digestive Health Small Breed Chicken & Brown Rice Dry Dog FoodDry // No. 17 on the labelWellness Core Digestive Health Chicken & Brown Rice Dry Dog FoodWellnessWellness Core Digestive Health Chicken & Brown Rice Dry Dog FoodDry // No. 17 on the labelHorizon Pulsar Grain-Free Turkey Formula Dry Dog FoodHorizonHorizon Pulsar Grain-Free Turkey Formula Dry Dog FoodDry // No. 17 on the labelHorizon Pulsar Grain-Free Lamb Formula Dry Dog FoodHorizonHorizon Pulsar Grain-Free Lamb Formula Dry Dog FoodDry // No. 17 on the labelBlue True Solutions Blissful Belly Digestive Care Formula Dry Dog FoodBlueBlue True Solutions Blissful Belly Digestive Care Formula Dry Dog FoodDry // No. 17 on the labelNutriSource PureVita Duck Dog Entree Wet Dog FoodNutriSourceNutriSource PureVita Duck Dog Entree Wet Dog FoodWet // No. 18 on the labelEvanger’s EVx Enhanced Diet Hip & Joint Support Chicken Jerky Dog TreatsEvanger'sEvanger’s EVx Enhanced Diet Hip & Joint Support Chicken Jerky Dog TreatsDog Treats // No. 18 on the labelNutriSource Heartland Select Grain-Free Wet Dog FoodNutriSourceNutriSource Heartland Select Grain-Free Wet Dog FoodWet // No. 18 on the labelRoyal Canin Shih Tzu Puppy Dry Dog FoodRoyal CaninRoyal Canin Shih Tzu Puppy Dry Dog FoodDry // No. 18 on the labelRoyal Canin Dachshund Puppy Dry Dog FoodRoyal CaninRoyal Canin Dachshund Puppy Dry Dog FoodDry // No. 18 on the labelNutriSource Element Series Coastal Plains Recipe Dry Dog FoodNutriSourceNutriSource Element Series Coastal Plains Recipe Dry Dog FoodDry // No. 18 on the labelHorizon Pulsar Grain-Free Pork Formula Dry Dog FoodHorizonHorizon Pulsar Grain-Free Pork Formula Dry Dog FoodDry // No. 18 on the labelHorizon Pulsar Grain-Free Chicken Formula Dry Dog FoodHorizonHorizon Pulsar Grain-Free Chicken Formula Dry Dog FoodDry // No. 18 on the labelNutriSource PureVita Turkey Dog Entree Grain-Free Wet Dog FoodNutriSourceNutriSource PureVita Turkey Dog Entree Grain-Free Wet Dog FoodWet // No. 19 on the labelNutriSource Seafood Select Grain-Free Wet Dog FoodNutriSourceNutriSource Seafood Select Grain-Free Wet Dog FoodWet // No. 19 on the labelNutriSource Turkey & Rice Wet Dog FoodNutriSourceNutriSource Turkey & Rice Wet Dog FoodWet // No. 19 on the labelNutriSource Woodlands Select Wet Dog FoodNutriSourceNutriSource Woodlands Select Wet Dog FoodWet // No. 19 on the labelNutriSource Chicken & Rice Small & Medium Breed Puppy Wet Dog FoodNutriSourceNutriSource Chicken & Rice Small & Medium Breed Puppy Wet Dog FoodWet // No. 19 on the labelGo! Solutions Digestion + Gut Health Chicken with Grains Dry Dog FoodGo! SolutionsGo! Solutions Digestion + Gut Health Chicken with Grains Dry Dog FoodDry // No. 19 on the labelRoyal Canin Chihuahua Puppy Dry Dog FoodRoyal CaninRoyal Canin Chihuahua Puppy Dry Dog FoodDry // No. 19 on the labelRoyal Canin Small Starter Mother And Babydog Dry Dog FoodRoyal CaninRoyal Canin Small Starter Mother And Babydog Dry Dog FoodDry // No. 19 on the labelRoyal Canin Medium Adult Dry Dog FoodRoyal CaninRoyal Canin Medium Adult Dry Dog FoodDry // No. 19 on the labelRoyal Canin Medium Digestive Care Dry Dog FoodRoyal CaninRoyal Canin Medium Digestive Care Dry Dog FoodDry // No. 19 on the labelRoyal Canin Setter Adult Dry Dog FoodRoyal CaninRoyal Canin Setter Adult Dry Dog FoodDry // No. 19 on the labelRoyal Canin Small Puppy Dry Dog FoodRoyal CaninRoyal Canin Small Puppy Dry Dog FoodDry // No. 20 on the labelRoyal Canin Yorkshire Terrier Adult Dry Dog FoodRoyal CaninRoyal Canin Yorkshire Terrier Adult Dry Dog FoodDry // No. 20 on the labelNutriSource Chicken & Rice Puppy Wet Dog FoodNutriSourceNutriSource Chicken & Rice Puppy Wet Dog FoodWet // No. 20 on the labelNutriSource Senior Chicken & Rice Wet Dog FoodNutriSourceNutriSource Senior Chicken & Rice Wet Dog FoodWet // No. 20 on the labelNutriSource Beef & Rice Wet Dog FoodNutriSourceNutriSource Beef & Rice Wet Dog FoodWet // No. 20 on the labelHorizon Legacy Slim & Vibrant - Grain-Free Dry Dog FoodHorizonHorizon Legacy Slim & Vibrant - Grain-Free Dry Dog FoodDry // No. 20 on the labelRoyal Canin Veterinary Gastrointestinal Puppy Dry Dog FoodRoyal CaninRoyal Canin Veterinary Gastrointestinal Puppy Dry Dog FoodDry // No. 20 on the labelRoyal Canin Bulldog Adult Dry Dog FoodRoyal CaninRoyal Canin Bulldog Adult Dry Dog FoodDry // No. 20 on the labelRoyal Canin Bulldog Puppy Dry Dog FoodRoyal CaninRoyal Canin Bulldog Puppy Dry Dog FoodDry // No. 20 on the labelRoyal Canin Large Puppy Dry Dog FoodRoyal CaninRoyal Canin Large Puppy Dry Dog FoodDry // No. 20 on the labelRoyal Canin Small Indoor Senior Dry Dog FoodRoyal CaninRoyal Canin Small Indoor Senior Dry Dog FoodDry // No. 20 on the label

Sources

What we read

Checked September 1, 2026.

  1. 1 Effect of Hydrolyzed Yeast Administration on Faecal Microbiota, Haematology, Serum Biochemistry and Cellular Immunity in Healthy Dogs Probiotics & Antimicrobial Proteins, 2021 // Journal
  2. 2 Diet digestibility and palatability and intestinal fermentative products in dogs fed yeast extract Italian Journal of Animal Science, 2022 // Journal
  3. 3 Brewery by-products (yeast and spent grain) as protein sources in rainbow trout (Oncorhynchus mykiss) feeds Frontiers in Marine Science, 2022 // Journal
  4. 4 Evaluation of Yeast Hydrolysate in a Low-Fishmeal Diet for Whiteleg Shrimp (Litopenaeus vannamei) Animals, 2023 // Journal
  5. 5 Potential benefits of yeast Saccharomyces and their derivatives in dogs and cats: a review Frontiers in Veterinary Science, 2023 // Journal
  6. 6 Allergies in Pets UC Davis School of Veterinary Medicine, 2019 // University
  7. 7 What’s in the Ingredients List? AAFCO, n.d. // Regulator
  8. 8 Improving pet food palatability: Yeast extract, hydrolyzed yeast PetfoodIndustry, 2016 // Industry
An ingredient on its own tells you very little. What matters is how much of it there is and where it sits in the list. That is why we weigh the top five rather than reacting to any single name further down. Back to the wiki

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