Skip to content
In The Kibble
My dogs

Ingredient file // Vitamin or mineral

Selenium Yeast

A useful trace mineral, not a health upgrade

Selenium yeast is inactive yeast grown with selenium and added to food in tiny amounts. It supplies a mineral dogs need for antioxidant enzymes and thyroid metabolism. Dog studies have not shown that this form makes a complete diet healthier.

Role in the food Supporting nutrient
What it is
Inactive yeast grown with selenium salts so its cells incorporate selenium into several chemical forms.
Made from
Yeast, cane molasses and selenium salts
Main job
Supplies dietary selenium
Typical amount
A puppy trial used 5 mg per kg of food
Watch for
Extra selenium from separate supplements
Not the same as
Live yeast

Straight answer

Is Selenium Yeast safe for dogs?

Read it as a mineral addition

Expect selenium yeast near the other vitamin and mineral additions, well below the ingredients that supply protein and calories. Check the food's nutritional adequacy statement, then judge the main ingredients and analysis. Selenium yeast is a reasonable way to supply selenium, but its name proves no health advantage.

Why it is in the food
Supplies dietary selenium

Our read // In our catalog

In 1 of every 8 foods we track

Share of foods that list it

13%

422 of the 3,205 foods with an ingredient list on file, from 34 brands. 306 dry dog food, 92 wet dog food, 12 freeze-dried dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 22. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

8%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 92% of foods.

Price per lb

Foods with it $3.85
All foods $3.25

Median of the cheapest bag price across 265 priced foods, 18% above the catalog. The price is the food's, not the ingredient's.

Who leans on it

21%

of the foods that list it are from NutriSource. 34 brands use it in total.

What it is

How it is made

Selenium yeast is made in a fermentation plant to supply a concentrated mineral ingredient. Producers grow yeast with sugar and selenium salts, then separate and wash the cells before drying them.4,5,9

  1. 01 // Source Yeast culture Yeast grows in a controlled tank supplied with cane molasses and other nutrients.
  2. 02 // Process Selenium added Selenium salts enter gradually while the yeast grows and incorporates some selenium into its cells.
  3. 03 // Process Separated and washed The cells are removed from the growth broth and washed to reduce leftover selenium salts.
  4. 04 // Output Dry inactive yeast The finished ingredient is a dry, nonliving powder used as a concentrated selenium source.

What is in it

Composition, dry matter

2128

mg/kg selenium

Selenium in the dry ingredient itself, not the finished food. Its trace addition supplies mineral without meaningful protein.

Selenium 2,128 mg/kg5
Crude protein 47.9%5
Ash 8%5
Crude fat 5.3%5
Crude fiber 1.9%5

The chemical forms vary between products. An analysis of 13 commercial samples found 3.6% to 51.8% of the selenium as elemental selenium, so a total selenium figure alone does not describe the forms a dog receives.4,5

Why it is in the bag

Here to supply selenium, in a trace amount

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

Selenium yeast is dried, nonliving yeast that carries concentrated selenium, so makers blend in a small amount to help a complete food meet the dog's selenium requirement alongside the selenium already in meat and grains. Ingredients are listed by weight, so it often sits deep in the list with other mineral additions. It adds no meaningful protein or calories. Its value is the mineral, and a dog study found no clear health edge over sodium selenite.2,5,6,8,9

  1. 01

    Meets selenium needs

    Selenium from the yeast adds to selenium already present in other ingredients. Formulators count both toward the amount required in a complete dog food.5,6

  2. 02

    Offers another selenium form

    Yeast supplies selenium in several forms, including selenomethionine. Dog research found a different blood response from sodium selenite, but no clear health advantage.2,4

  3. 03

    Added at trace levels only

    Dogs need selenium in milligrams per kilogram of diet, so a concentrated yeast powder is blended into the full batch rather than relied on for calories or protein.1,5

How much A controlled puppy trial added 5 mg of selenium yeast per kg of complete dry food.1

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

    Selenium yeast is absorbed better than selenium salts

    Outruns the evidence

    Evidence

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

    In an 80-day comparison involving 24 dogs, yeast produced a stronger rise in blood selenium after a meal than sodium selenite. The study found no difference in selenium availability by its balance measure, so a blanket absorption advantage goes too far.2

  2. Brands say

    Selenium yeast boosts antioxidant protection

    Outruns the evidence

    Evidence

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

    In the same 24-dog study, both added selenium sources increased activity of a selenium-dependent antioxidant enzyme compared with a lower-selenium diet. Neither source improved the measured markers of oxidative damage. More enzyme activity is not proof of better health.2

  3. Brands say

    Selenium yeast improves gut health

    Outruns the evidence

    Evidence

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

    A 12-puppy trial found more fecal Lactobacillus and certain fermentation products with yeast than with sodium selenite. Broad bacterial diversity did not change, and the healthy puppies had no measured gut illness to improve.1

  4. Brands say

    Selenium yeast improves thyroid function

    Outruns the evidence

    Evidence

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

    In a 24-dog crossover, canned diets carrying ingredient selenium, mostly organically bound, were compared with kibble dosed with sodium selenite, and the T3:T4 ratio did not differ. This study did not test selenium yeast itself, so it gives the thyroid claim no support.3

  5. Owners say

    Selenium yeast prevents yeast infections

    Outruns the evidence

    Evidence

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

    The ingredient is dried, nonliving yeast, not a treatment. The selenium-source trials measured blood markers and fecal bacteria, not yeast infections. Its name offers no reason to expect protection from infection.1,2,9

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    It has a specific job: supplying selenium. The amount used is far too small to add meaningful protein or bulk. Read it as a mineral addition, even though the ingredient itself is yeast.1,5

  2. Q02

    Does organic mean better?

    Not proven

    Here, organic describes selenium bound into carbon-containing molecules. A dog study found a stronger blood response from yeast, but the measured antioxidant outcomes did not beat sodium selenite. The word does not promise a healthier dog.2,4

  3. Q03

    Why is it near the end?

    Tiny dose

    Ingredients are listed by weight, and selenium yeast supplies a trace mineral at a very small dose. Its place near other mineral additions is expected; the list does not reveal the food's total selenium content.1,5,8

  4. Q04

    Can this cause a yeast infection?

    No

    Selenium yeast is inactive when it reaches the food plant. It is added as a mineral source, not as a live culture. Its presence on an ingredient list is no reason to expect a yeast infection.9

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. NutriSource 87 / 91
  2. Go! Solutions 34 / 46
  3. Open Farm 31 / 44
  4. Now Fresh 26 / 35
  5. Horizon 24 / 27
  6. Victor 21 / 27
  7. Annamaet 20 / 20
  8. Blue Seal 17 / 19
  9. Evanger's 15 / 30
  10. Verus 15 / 19

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

Plus 24 more brands.

Amazon best sellers that list it

  1. #31 Open Farm Wild Caught Salmon with Ancient Grains 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. Mixed Tocopherols 42%
  2. Chicken Fat 37%
  3. Peas 33%
  4. Flaxseed 30%
  5. Natural Flavor 28%
  6. Chicken 28%
  7. Chicken Meal 25%
  8. Brown Rice 22%
  9. Turkey 19%
  10. Sweet Potatoes 18%
  11. Barley 17%
  12. Salmon 16%

On the shelf

Foods that list Selenium Yeast

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

Merrick Fresh Selects Turkey & Brown Rice Fresh Frozen Dog FoodMerrickMerrick Fresh Selects Turkey & Brown Rice Fresh Frozen Dog FoodFrozen // No. 6 on the labelAgainst the Grain The Good Egg - Steak ‘n Egg Wet Dog FoodAgainst the GrainAgainst the Grain The Good Egg - Steak ‘n Egg Wet Dog FoodWet // No. 6 on the labelAgainst the Grain The Good Egg - Bacon N Eggs Scramble Wet Dog FoodAgainst the GrainAgainst the Grain The Good Egg - Bacon N Eggs Scramble Wet Dog FoodWet // No. 6 on the labelEvanger’s Super Premium Heritage Classic Chicken & Rice Dog Food TopperEvanger'sEvanger’s Super Premium Heritage Classic Chicken & Rice Dog Food TopperTopper // No. 6 on the labelMerrick Fresh Selects Chicken & Brown Rice Fresh Frozen Dog FoodMerrickMerrick Fresh Selects Chicken & Brown Rice Fresh Frozen Dog FoodFrozen // No. 7 on the labelEvanger’s Heritage Classic Lamb & Rice Dinner Wet Dog FoodEvanger'sEvanger’s Heritage Classic Lamb & Rice Dinner Wet Dog FoodWet // No. 7 on the labelFirstMate Pacific Ocean Fish Weight Control Formula Grain-Free Dry Dog FoodFirstMateFirstMate Pacific Ocean Fish Weight Control Formula Grain-Free Dry Dog FoodDry // No. 9 on the labelFirstMate Pacific Ocean Fish Large Breed Formula Grain-Free Dry Dog FoodFirstMateFirstMate Pacific Ocean Fish Large Breed Formula Grain-Free Dry Dog FoodDry // No. 9 on the labelGather Free Acres Organic Free-Run Chicken Recipe for Adult Dogs Grain-Free Dry Dog FoodGatherGather Free Acres Organic Free-Run Chicken Recipe for Adult Dogs Grain-Free Dry Dog FoodDry // No. 10 on the labelZiwi Air-Dried Chicken Dog Food TopperZIWIZiwi Air-Dried Chicken Dog Food TopperTopper // No. 11 on the labelZiwi Beef Grain-Free Wet Dog FoodZIWIZiwi Beef Grain-Free Wet Dog FoodWet // No. 12 on the labelCaru Classics (Natural Stews) Classics Chicken Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Chicken Stew Grain-Free Wet Dog FoodWet // No. 12 on the label
Show 48 more
Merrick Fresh Selects Beef & Brown Rice Fresh Frozen Dog FoodMerrickMerrick Fresh Selects Beef & Brown Rice Fresh Frozen Dog FoodFrozen // No. 7 on the labelEvanger’s EVX Restricted Diet: Weight Management Wet Dog FoodEvanger'sEvanger’s EVX Restricted Diet: Weight Management Wet Dog FoodWet // No. 7 on the labelEvanger’s Grain Free; Super Premium Chicken Dinner Wet Dog FoodEvanger'sEvanger’s Grain Free; Super Premium Chicken Dinner Wet Dog FoodWet // No. 7 on the labelEvanger’s Heritage Classic Senior & Weight Management Wet Dog FoodEvanger'sEvanger’s Heritage Classic Senior & Weight Management Wet Dog FoodWet // No. 8 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. 8 on the labelEvanger’s Grain Free LID Venison + Beef Dinner Wet Dog FoodEvanger'sEvanger’s Grain Free LID Venison + Beef Dinner Wet Dog FoodWet // No. 8 on the labelEvanger’s EVX Restricted Diet: Digestion Bland Diet Wet Dog FoodEvanger'sEvanger’s EVX Restricted Diet: Digestion Bland Diet Wet Dog FoodWet // No. 9 on the labelFirstMate Pacific Ocean Fish Meal Original Formula Grain-Free Dry Dog FoodFirstMateFirstMate Pacific Ocean Fish Meal Original Formula Grain-Free Dry Dog FoodDry // No. 9 on the labelFirstMate Limited Ingredient Diet Free Run Chicken Formula Dry Dog FoodFirstMateFirstMate Limited Ingredient Diet Free Run Chicken Formula Dry Dog FoodDry // No. 10 on the labelFirstMate Chicken Meal With Blueberries Formula Grain-Free Dry Dog FoodFirstMateFirstMate Chicken Meal With Blueberries Formula Grain-Free Dry Dog FoodDry // No. 10 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. 11 on the labelFirstMate Kasiks Wild Pacific Ocean Fish Meal Formula Grain-Free Dry Dog FoodFirstMateFirstMate Kasiks Wild Pacific Ocean Fish Meal Formula Grain-Free Dry Dog FoodDry // No. 11 on the labelFirstMate Skoki Dry Dog FoodFirstMateFirstMate Skoki Dry Dog FoodDry // No. 11 on the labelFirstMate Grain Friendly Cage Free Chicken Meal & Oats Formula Small Bites Dry Dog FoodFirstMateFirstMate Grain Friendly Cage Free Chicken Meal & Oats Formula Small Bites Dry Dog FoodDry // No. 12 on the labelFirstMate Kasiks Free Run Chicken Meal Formula Grain-Free Dry Dog FoodFirstMateFirstMate Kasiks Free Run Chicken Meal Formula Grain-Free Dry Dog FoodDry // No. 12 on the labelK9 Natural Chicken Feast Grain-Free Freeze-Dried Dog FoodK9 NaturalK9 Natural Chicken Feast Grain-Free Freeze-Dried Dog FoodFreeze-Dried // No. 13 on the labelZiwi Wet/Canned Lamb Wet Dog FoodZIWIZiwi Wet/Canned Lamb Wet Dog FoodWet // No. 13 on the labelZiwi Venison Wet Dog FoodZIWIZiwi Venison Wet Dog FoodWet // No. 13 on the labelCaru Classics (Natural Stews) Classics Turkey Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Turkey Stew Grain-Free Wet Dog FoodWet // No. 13 on the labelGo! Solutions Sensitivities Shredded Turkey Limited Ingredient Grain-Free Wet Dog FoodGo! SolutionsGo! Solutions Sensitivities Shredded Turkey Limited Ingredient Grain-Free Wet Dog FoodWet // No. 13 on the labelPurina Beneful Freshly Prepared Stews Chicken Dinner with Carrots and Rice in Gravy Wet Dog FoodPurinaPurina Beneful Freshly Prepared Stews Chicken Dinner with Carrots and Rice in Gravy Wet Dog FoodWet // No. 13 on the labelPurina Beneful Freshly Prepared Classics With Lamb, Chopped Kale and Carrots Pate Wet Dog FoodPurinaPurina Beneful Freshly Prepared Classics With Lamb, Chopped Kale and Carrots Pate Wet Dog FoodWet // No. 13 on the labelNutriSource Choice Performance Chicken Dry Dog FoodNutriSourceNutriSource Choice Performance Chicken Dry Dog FoodDry // No. 13 on the labelNutriSource PureVita Grain-Free Pork & Peas Entree Dry Dog FoodNutriSourceNutriSource PureVita Grain-Free Pork & Peas Entree Dry Dog FoodDry // No. 13 on the labelNutriSource Large Breed Trout & Rice Recipe Dry Dog FoodNutriSourceNutriSource Large Breed Trout & Rice Recipe Dry Dog FoodDry // No. 13 on the labelNutriSource Chicken & Duck Recipe Freeze-Dried Dog FoodNutriSourceNutriSource Chicken & Duck Recipe Freeze-Dried Dog FoodFreeze-Dried // No. 14 on the labelZIWI Air-Dried Venison Dog Food TopperZIWIZIWI Air-Dried Venison Dog Food TopperTopper // No. 14 on the labelCaru Classics (Natural Stews) Classics Beef Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Beef Stew Grain-Free Wet Dog FoodWet // No. 14 on the labelCaru Daily Dish Chicken Stew Grain-Free Wet Dog FoodCaruCaru Daily Dish Chicken Stew Grain-Free Wet Dog FoodWet // No. 14 on the labelNutriSource Heartland Select Grain-Free Wet Dog FoodNutriSourceNutriSource Heartland Select Grain-Free Wet Dog FoodWet // No. 14 on the labelPurina Beneful Freshly Prepared Stews Turkey Dinner with Spinach and Ditalini Pasta in Gravy Wet Dog FoodPurinaPurina Beneful Freshly Prepared Stews Turkey Dinner with Spinach and Ditalini Pasta in Gravy Wet Dog FoodWet // No. 14 on the labelPurina Beneful Freshly Prepared Classics With Salmon, Green Beans and Spinach Pate Wet Dog FoodPurinaPurina Beneful Freshly Prepared Classics With Salmon, Green Beans and Spinach Pate Wet Dog FoodWet // No. 14 on the labelBlue Seal Natural 26 Dry Dog FoodBlue SealBlue Seal Natural 26 Dry Dog FoodDry // No. 14 on the labelNutriSource Choice Chicken Meal & Barley Recipe Dry Dog FoodNutriSourceNutriSource Choice Chicken Meal & Barley Recipe Dry Dog FoodDry // No. 14 on the labelGather Wild Ocean Line-Caught Cod Recipe for Adult Dogs Grain-Free Dry Dog FoodGatherGather Wild Ocean Line-Caught Cod Recipe for Adult Dogs Grain-Free Dry Dog FoodDry // No. 14 on the labelNutriSource Beef & Lamb Recipe Freeze-Dried Dog FoodNutriSourceNutriSource Beef & Lamb Recipe Freeze-Dried Dog FoodFreeze-Dried // No. 15 on the labelZIWI Air-Dried Beef Dog Food TopperZIWIZIWI Air-Dried Beef Dog Food TopperTopper // No. 15 on the labelCaru Classics (Natural Stews) Classics Pork Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Pork Stew Grain-Free Wet Dog FoodWet // No. 15 on the labelCaru Daily Dish Beef Stew Grain-Free Wet Dog FoodCaruCaru Daily Dish Beef Stew Grain-Free Wet Dog FoodWet // No. 15 on the labelCaru Classics (Natural Stews) Classics Turkey with Lamb Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Turkey with Lamb Stew Grain-Free Wet Dog FoodWet // No. 15 on the labelHalo Holistic Vegan Plant-Based with Kelp Recipe Adult Dry Dog FoodHaloHalo Holistic Vegan Plant-Based with Kelp Recipe Adult Dry Dog FoodDry // No. 15 on the labelGo! Solutions Sensitivities Duck Pâté Grain-Free Limited Ingredient Wet Dog FoodGo! SolutionsGo! Solutions Sensitivities Duck Pâté Grain-Free Limited Ingredient Wet Dog FoodWet // No. 15 on the labelOrijen Chicken Recipe Pâté with Liver Grain-Free Wet Dog FoodOrijenOrijen Chicken Recipe Pâté with Liver Grain-Free Wet Dog FoodWet // No. 15 on the labelNutriSource High Plains Select Wet Dog FoodNutriSourceNutriSource High Plains Select Wet Dog FoodWet // No. 15 on the labelNutriSource Prairie Select Grain-Free Wet Dog FoodNutriSourceNutriSource Prairie Select Grain-Free Wet Dog FoodWet // No. 15 on the labelPurina Beneful Freshly Prepared Classics Turkey Dinner with Sweet Potatoes and Green Beans Pate Wet Dog FoodPurinaPurina Beneful Freshly Prepared Classics Turkey Dinner with Sweet Potatoes and Green Beans Pate Wet Dog FoodWet // No. 15 on the labelPurina Beneful Freshly Prepared Classics Chicken Dinner with Carrots and Peas Pate Wet Dog FoodPurinaPurina Beneful Freshly Prepared Classics Chicken Dinner with Carrots and Peas Pate Wet Dog FoodWet // No. 15 on the labelFirstMate Australian Lamb Meal Formula Grain-Free Dry Dog FoodFirstMateFirstMate Australian Lamb Meal Formula Grain-Free Dry Dog FoodDry // No. 15 on the label

Sources

What we read

Checked October 1, 2026.

  1. 1 Supplemental selenium source on gut health: insights on fecal microbiome and fermentation products of growing puppies FEMS Microbiology Ecology, 2020 // Journal
  2. 2 Avaliação de fontes de selênio e seus efeitos no perfil metabólico e condição reprodutiva de cães Universidade Estadual Paulista, 2010 // University
  3. 3 Selenium Digestibility and Bioactivity in Dogs: What the Can Can, the Kibble Can't PLOS ONE, 2016 // Journal
  4. 4 Inorganic and Organic Selenium Speciation of Seleno-Yeasts Used as Feed Additives: New Insights from Elemental Selenium Determination Biological Trace Element Research, 2023 // Journal
  5. 5 Selenium yeast Feedtables (INRAE, CIRAD and AFZ), n.d. // Database
  6. 6 AAFCO DOG AND CAT FOOD AAFCO, 2013 // Regulator
  7. 7 Supplements AAFCO, n.d. // Regulator
  8. 8 Reading Labels AAFCO, n.d. // Regulator
  9. 9 Selenium U.S. Government Publishing Office, 21 CFR 573.920, 2023 // Government
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

Keep In The Know,
Know What's In The Bowl

The In the Kibble newsletter. Useful emails for dog owners: what we find inside dog food, how to feed well, and a heads-up when a food is recalled.
DOUBLE OPT-IN // ONE CLICK TO STOP // NEVER SHARED