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Ingredient file // Vitamin or mineral

Biotin

An essential vitamin with an oversold coat claim

Biotin is a B vitamin added to dog food in small amounts. Dogs use it to process fats, sugars and some amino acids. Deficiency is rare, and extra biotin has not been shown to improve the coat of a healthy dog.

What it is
A manufactured B vitamin added to food as a measured source of biotin for normal metabolism.
Made from
A chemically synthesized biotin precursor
Main job
Supplies a B vitamin
Typical amount
Not published
Watch for
Coat problems need a diagnosis
Not the same as
A skin treatment

Our read // In our catalog

In 1 of every 3 foods we track

Share of foods that list it

29%

746 of the 2,533 foods with an ingredient list on file, from 43 brands. 564 dry dog food, 174 wet dog food, 5 dog food topper.

Each square is 1% of the catalog

Where it sits on the label

Median position 38. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

0%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 100% of foods.

Price per lb

Foods with it $2.85
All foods $3.23

Median of the cheapest bag price across 487 priced foods, 12% below the catalog. The price is the food's, not the ingredient's.

Who leans on it

18%

of the foods that list it are from Blue. 43 brands use it in total.

The story

Raw egg white led scientists to biotin

Biotin was found through the damage its absence caused. In 1916, W. G. Bateman reported that diets heavy in raw egg white made dogs, cats, rabbits and humans sick. By 1927, Margarete Boas and Helen Parsons had described the pattern in rats fed egg white as their only protein: hair loss, dermatitis, nerve problems and eventually death. Researchers called it egg white injury.9,10

The cure turned up in several labs at once. In 1936, Fritz Kögl and Benno Tönnis isolated crystals of a yeast growth factor from egg yolk and named it biotin. Paul György, working on the egg white problem, called his factor vitamin H, after the German words for hair and skin. By 1940 the factors were recognized as one compound, and in 1941 György showed that avidin in egg white causes the injury by binding biotin.5,9,10

The turning point for feed was synthesis. Chemists first made biotin in 1943. In 1949, Hoffmann La Roche received a patent for a route by Moses Wolf Goldberg and Leo H. Sternbach that halved the volumes to process, which the inventors said cut investment and cost at technical scale. Today DSM puts biotin supplementation at 10 to 20 cents per ton of broiler starter feed, and it reaches dog food through the same vitamin premixes.3,8,9

What it is

How it is made

Feed biotin is manufactured rather than recovered from a food leftover. Producers synthesize and purify the vitamin, then dilute it with carriers so a small addition distributes evenly through a batch.3

  1. 01 // Source Chemical precursor Manufacturers start with dibenzylbiotin, a compound used to synthesize the active form of the vitamin.
  2. 02 // Process Synthesized and purified Chemical processing produces purified D-biotin as a nearly dry crystalline powder.
  3. 03 // Process Blended with carriers Suppliers mix the concentrated vitamin with carriers to make feed preparations containing 2% or 10% biotin.
  4. 04 // Output Feed vitamin powder The preparation enters a vitamin premix that the food maker distributes through the recipe.

What is in it

Composition, dry matter

98.5

% biotin

The British Pharmacopoeia's lower assay limit for purified biotin on a dried substance basis. Feed biotin has a separate 97% minimum.

D-biotin 98.5-101%4
Related substances 0-2%4
Sulfated ash 0-0.1%4

These are limits for purified biotin, not a typical feed preparation or finished dog food. The related substance and ash rows are test limits for the nearly dry material; zero is a logical lower bound, not a measured result. Feed preparations dilute biotin with carriers.3,4

Benefits

What it does for your dog

Each benefit carries the same evidence grade as the claims below.

  1. 01

    Normal use of fats and sugars

    Biotin is the cofactor for 4 carboxylase enzymes that handle fats, glucose and some amino acids. The support is its essential role; no dog trial shows extra intake adds anything.5

    1. Strong
    2. Some
    3. Thin
    4. None
  2. 02

    Skin and coat without deficiency lesions

    Kittens kept short of biotin on raw egg white diets lost hair and developed scaly skin until biotin was given. The dog evidence is an uncontrolled series, so this rests mainly on cat data.2,5,7

    1. Strong
    2. Some
    3. Thin
    4. None
  3. 03

    Higher blood biotin from the diet

    In 64 healthy dogs, blood biotin rose as dietary vitamin levels went up over 122 days. Biotin in food reaches the dog, though coat condition did not change.1

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

Why it is in the bag

What the manufacturer gets

  1. 01

    Supplies measured biotin

    Biotin works with enzymes that process fats, sugars and some amino acids. Adding a measured source lets the formulator account for it even when ingredient sources vary.5

  2. 02

    Distributes a small addition

    Suppliers dilute purified biotin with carriers before it reaches the food mixer. A premix makes the small addition easier to spread through a batch.3

  3. 03

    Uses routine feed supply

    Multiple suppliers sell purified biotin and diluted feed preparations. Food makers buy it through the same premix supply route used for other added vitamins.3

How much A usual inclusion rate in dog food was not published; a skin treatment series gave about 5 mg per 10 kg of body weight daily.2

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

    Biotin supports normal nutrient metabolism

    Evidence

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

    Biotin is a cofactor in 4 mammalian enzyme reactions. That supports its nutritional role, but the mechanism does not show that adding more improves a dog already eating a complete diet.5

  2. Brands say

    Biotin treats dull coats and itchy skin

    Outruns the evidence

    Evidence

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

    In a Roche-authored series, clinicians recorded improvement in 108 of 119 dogs with skin or coat problems after biotin treatment. There was no untreated group, so the series cannot separate biotin's effect from other changes.2

  3. Brands say

    Extra biotin makes healthy coats shinier

    Outruns the evidence

    Evidence

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

    A study assigned 64 healthy dogs to graded vitamin intakes and checked them through day 122. Blood biotin rose, but coat condition did not improve. Several vitamins changed together, so the study cannot isolate biotin.1

  4. Owners say

    Biotin in dog food is dangerous

    Outruns the evidence

    Evidence

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

    A feed safety assessment found biotin safe for animals under its authorized conditions of use. That addresses normal feed additions, not whether a dog should receive a large supplement without a reason.3

The research

Studies worth knowing

Published research we read for this page, dog studies first.

  1. 2007 // Feeding trial, 4 vitamin levels

    More dietary vitamins raised blood biotin but not coat quality1

    64 healthy privately owned dogs aged 1 to 8 years

    Found. Dogs were split into 4 groups with graded vitamin intakes and followed for 122 days. Blood biotin climbed with higher intake, yet coat and hair condition stayed the same. Several vitamins rose together, so biotin's share is unclear.

    What it means. Biotin in food does reach a dog's blood, but a healthy dog's coat should not look different on a higher dose.

  2. 1989 // Treatment series, no comparison group

    Most dogs with coat problems improved on daily biotin2

    119 dogs with skin or coat problems such as dull coat, hair loss or itching

    Found. Dogs received about 5 mg biotin per 10 kg of body weight daily for 3 to 5 weeks. All signs were reported cured in 60% of cases and improved in a further 31%. Results differed by breed.

    What it means. This was a treatment dose without an untreated group, so it cannot show what the biotin listed on a bag does for a coat.

  3. 1977 // Deficiency diet, then treatment

    Raw egg white diets stripped kittens' coats until biotin was given7

    Growing kittens (cat study; no comparable dog deficiency trial found)

    Found. Kittens fed 18.5% raw egg white for 25 weeks or 32% for 12 weeks developed hair loss and scaly skin and lost weight. A biotin dependent liver enzyme ran at 4% and 24% of its treated level. Biotin injections reversed the signs.

    What it means. Biotin deficiency is real and shows in the coat, but it took months of heavy raw egg white feeding to cause it.

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    Biotin is a vitamin used by the dog's enzymes. It supplies no meaningful protein or calories, and its small addition puts it near the end of an ingredient list.5,6

  2. Q02

    Will it fix a dull coat?

    Not reliably

    An uncontrolled treatment series reported improvement in dogs with coat problems. A feeding study found no coat benefit in healthy dogs given higher vitamin intakes. A persistent coat problem needs a diagnosis.1,2,5

  3. Q03

    Does its absence mean deficiency?

    No

    Food ingredients naturally supply biotin, and intestinal microbes also make it. Deficiency is rare. The ingredient list shows separately added biotin, not the food's total biotin content.5,6

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Blue 138
  2. Wellness 79
  3. Nulo 73
  4. Nutro 68
  5. Diamond 30
  6. Bil-Jac 29
  7. Horizon 26
  8. Health Extension 22
  9. Victor 20
  10. Taste of the Wild 20

Plus 33 more brands.

Amazon best sellers that list it

  1. #1 Blue Life Protection Formula Adult Chicken and Brown Rice Recipe Dry Dog Food
  2. #5 Blue Life Protection Formula Adult Small Breed Chicken and Brown Rice Recipe Dry Dog Food
  3. #8 Diamond Naturals Skin & Coat Formula All Life Stages Salmon & Potato Formula Dry Dog Food
  4. #17 Taste of the Wild High Prairie Canine Recipe with Roasted Bison & Roasted Venison Dry Dog Food
  5. #27 Blue Life Protection Formula Senior Chicken and Brown Rice Recipe Dry Dog Food
  6. #30 Blue Life Protection Formula Puppy Chicken and Brown Rice Recipe Dry Dog Food
  7. #35 Blue Life Protection Formula Small Breed Senior Chicken and Brown Rice Recipe Dry Dog Food
  8. #42 Iams Adult Large Breed 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 44%
  2. Chicken Fat 43%
  3. Flaxseed 42%
  4. Peas 39%
  5. Chicken Meal 37%
  6. Natural Flavor 36%
  7. Brown Rice 23%
  8. Oatmeal 22%
  9. Dried Plain Beet Pulp 20%
  10. Barley 19%
  11. Potatoes 16%
  12. Sweet Potatoes 16%

Our read // On the bag

Treat it as a small vitamin addition

Biotin belongs near the other added vitamins at the end of the ingredient list. Its low position is normal and tells you little about total biotin in the food. Check the nutritional adequacy statement when choosing a diet. For a coat problem, the word biotin on a bag is not a treatment plan.

Sources

What we read

Checked September 1, 2026.

  1. 1 Blood vitamin concentrations in privately owned dogs fed non-standardized commercial diets and after intake of diets with specified vitamin concentrations Journal of Animal Physiology and Animal Nutrition, 2007 // Journal
  2. 2 Clinical study on the effect of biotin on skin conditions in dogs Schweizer Archiv für Tierheilkunde, 1989 // Journal
  3. 3 Assessment on the Feed Additive Consisting of Biotin for All Animal Species for the Modification of Its Authorisation (ADISSEO, DSM Nutritional Products Ltd., NHU Europe GmbH) (RP2227) Food Standards Agency and Food Standards Scotland, 2026 // Government
  4. 4 Biotin British Pharmacopoeia, 2025 // Regulator
  5. 5 Nutritional Requirements of Small Animals Merck Veterinary Manual, 2024 // Book
  6. 6 Reading Labels AAFCO, n.d. // Regulator
  7. 7 Biotin deficiency in the cat and the effect on hepatic propionyl CoA carboxylase The Journal of Nutrition, 1977 // Journal
  8. 8 Synthesis of biotin (US2489235A) Google Patents (assignee Hoffmann La Roche), 1949 // Industry
  9. 9 Biotin: Tiny Quantities/Big Responsibilities dsm-firmenich Animal Nutrition and Health, 2022 // Industry
  10. 10 Biotin Wikipedia, 2026 // Reference
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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