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Ingredient file // Vitamin or mineral

Vitamins

Useful vitamin additions, not proof of balance

On a dog food listing, “Vitamins” groups vitamin sources added during manufacturing. They help the finished food reach nutrient targets despite variation in other ingredients and losses during cooking. Their presence alone does not prove the food is complete and balanced.

Role in the food Supporting nutrient
What it is
A measured blend of vitamin sources added to a dog food recipe in small amounts.
Made from
Prepared vitamin sources and a carrier
Main job
Meet vitamin targets
Typical amount
Varies; one recipe used 2% combined premix
Watch for
Excess vitamin D from mixing errors
Not the same as
A daily multivitamin

Straight answer

Is Vitamins safe for dogs?

Check the food's adequacy statement first

Vitamins near the end of an ingredient list are doing a small, necessary job. Look for a complete and balanced statement that matches your dog's life stage, then follow the feeding directions. The word “Vitamins” tells you sources were added; it does not reveal the finished food's vitamin amounts.

Why it is in the food
Meet vitamin targets

Our read // In our catalog

In 1 of every 2 foods we track

Share of foods that list it

40%

1,285 of the 3,204 foods with an ingredient list on file, from 58 brands. 770 dry dog food, 447 wet dog food, 29 frozen dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 18. In the top five of 2 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

14%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 86% of foods.

Price per lb

Foods with it $3.33
All foods $3.25

Median of the cheapest bag price across 649 priced foods, about level with the catalog. The price is the food's, not the ingredient's.

Who leans on it

12%

of the foods that list it are from Royal Canin. 58 brands use it in total.

The story

From blacktongue cures to vitamin D recalls

Dogs helped science find one of the vitamins now added to their food. In 1926, Goldberger showed that blacktongue in dogs was the canine form of human pellagra. In 1937, Conrad Elvehjem's group at the University of Wisconsin found that nicotinic acid, now called niacin, cured blacktongue in dogs. Medical researchers soon showed the same compound treated pellagra in people. Niacin now has its own minimum in the AAFCO profile for adult dog food.5,9

Vitamin sources are concentrated, and the doses are small, so one mistake spreads across a lot of food. On December 3, 2018, FDA warned owners about recalls of several dry dog foods after dogs eating them developed vitamin D toxicity. State and private lab tests cited by FDA found some samples held as much as about 70 times the intended amount of vitamin D. The recalled brands traced back to a common contract manufacturer.10

On January 31, 2019, Hill's Pet Nutrition told FDA that a dog had developed vitamin D toxicity after eating one of its canned foods, and recalled 25 products. After the March 20 expansion, the recall covered 86 lots of 33 canned varieties. In October 2019, an FDA warning letter to a premix maker traced a canned dog food premix error to look-alike drums of vitamin D and vitamin E and a failed second check.3,11

What it is

How it is made

Premix suppliers prepare concentrated vitamin sources for pet food plants. Because the doses are small, they blend the sources with a carrier that helps distribute them through a much larger batch of food.2,8

  1. 01 // Source Vitamin sources Concentrated vitamin ingredients are selected to match the recipe's planned nutrient targets.
  2. 02 // Process Weighed and blended The supplier weighs the vitamin ingredients and mixes them with carrier material to spread the fine powders.
  3. 03 // Output Bagged premix The prepared blend arrives at the food plant ready to be weighed into a production batch.

What is in it

Composition, dry matter

50

IU/kg food

AAFCO's vitamin E minimum for complete adult dog food. It is a finished food target, not the amount in a premix.

Thiamine 2.3 mg/kg5
Riboflavin 5.2 mg/kg5
Pantothenic acid 12 mg/kg5
Niacin 13.6 mg/kg5

These rows are dry matter minimums for finished adult dog food, not an analysis of the ingredient called “Vitamins.” Premix recipes differ, and meat and plant ingredients also contribute vitamins.2,5

Benefits

What it does for your dog

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

  1. 01

    Prevents classic deficiency diseases

    Dogs need niacin, thiamine and other vitamins. In the 1930s, nicotinic acid cured blacktongue in dogs. The support comes from essentiality and those classic experiments. Doses above the requirement add nothing proven.5,9

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

    Enough thiamine after heat processing

    Heat-processed canned foods tend to run low in thiamine. In canned cat food, recipes with a vitamin premix held 55.1 mg/kg thiamine on a dry matter basis, versus 7.5 mg/kg without. We found no matching dog study.14

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

    Vitamin D that reaches the blood

    In a Hill's funded trial, 40 beagles were split across 5 foods, and blood vitamin D rose with the vitamin D in the food. That shows dogs absorb the added form. It does not show a health gain.13

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

Why it is in the bag

Small amount, real job: hitting the vitamin targets

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

Vitamins often sit low on labels because the doses are tiny, and ingredients are listed by weight. Low position does not make them filler. Makers add them so the finished food meets the AAFCO nutrient profiles even when the meat and plant ingredients vary, and to cover cooking losses. In one kibble batch, vitamin A fell 34% after extrusion and drying. The food's adequacy statement tells you whether the targets were met.2,6

  1. 01

    Meets nutrient targets

    A formulator adds measured vitamin sources to the nutrients already present in other ingredients to reach the finished food's vitamin targets.2,5

  2. 02

    Spreads small doses

    A carrier helps fine vitamin powders disperse through a large batch. Poor distribution could leave some portions with too much or too little.8

  3. 03

    Reduces separate weighings

    A prepared premix lets the plant weigh one blend into a production batch instead of measuring each concentrated vitamin powder on the food line.2,8

How much There is no standard amount for “Vitamins”; one published dog food manufacturing study used 2% combined vitamin and mineral premix.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

    Added vitamins help a food meet nutrient targets

    Evidence

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

    AAFCO's adult dog food profile sets a dry matter thiamine minimum of 2.25 mg/kg. Adding measured vitamin sources helps reach such targets. The ingredient listing alone cannot show whether the finished food meets them.5,6

  2. Brands say

    Cooking reduces some vitamins in kibble

    Evidence

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

    In one commercial production batch, measured vitamin A after extrusion and drying was 34% below its initial level. The study measured vitamin A, so that loss does not apply to every vitamin or recipe.2

  3. Brands say

    Extra antioxidant vitamins protect dogs from disease

    Outruns the evidence

    Evidence

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

    A Hill's funded, 84-day study in 40 dogs found less DNA damage on diets with an antioxidant blend. It measured blood cell markers, not whether dogs developed fewer diseases, and cannot isolate vitamin E's effect.1

  4. Owners say

    More added vitamins are always safe

    Outruns the evidence

    Evidence

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

    FDA found 2 premix batches with vitamin D at 2,903% and 307% of the claimed amount. The first resulted from a mixing error; residue affected the next batch. Excess vitamin D can injure kidneys.3,4

The research

Studies worth knowing

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

  1. 2023 // Feeding trial, 5 foods

    More vitamin D in food raised dogs' blood levels13

    40 adult beagles

    Found. After 26 weeks, every dog on food with at least 5,510.9 IU/kg vitamin D (dry matter basis) reached 100 ng/mL in the blood. Up to 9,992.5 IU/kg, researchers saw no signs of excess.

    What it means. Dogs absorb vitamin D from complete food, and blood levels follow the dose. Hill's funded the trial, and it does not cover the much larger overdoses seen in recalls.

  2. 2016 // Survey, then supplement trial

    A vitamin D supplement on top of food did little12

    46 pet dogs, 13 in the trial

    Found. Of 46 healthy dogs, 33 had blood vitamin D below 100 ng/ml. Some dogs got a daily supplement at about 5 times the recommended allowance. Their levels beat the placebo group only at weeks 9 to 10.

    What it means. In healthy adult pet dogs, a daily vitamin D supplement near the safe upper limit did not raise blood levels quickly, the authors concluded.

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    Vitamins supply nutrients the finished food needs. A premix also has carrier material so small doses mix evenly. Judge the food by its nutritional adequacy statement, not the vitamin listing's low position.5,6,8

  2. Q02

    Do vitamins mean poor ingredients?

    No

    Other ingredients contribute vitamins, but their amounts vary and processing can reduce some of them. A measured premix gives the formulator a way to reach finished food targets.2,5

  3. Q03

    Should I add a multivitamin?

    Usually no

    A healthy dog eating a complete and balanced food for its life stage generally does not need one. Extra supplements risk pushing some nutrients too high, especially vitamin D.4,7

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Royal Canin 158 / 160
  2. Purina 157 / 185
  3. Merrick 97 / 107
  4. NutriSource 88 / 91
  5. Instinct 78 / 98
  6. Fromm 67 / 67
  7. Zignature 46 / 46
  8. Natural Balance 36 / 48
  9. Halo 36 / 41
  10. Open Farm 34 / 42

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

Plus 48 more brands.

Amazon best sellers that list it

  1. #2 Purina One SmartBlend Adult Dog Lamb & Rice Formula Dry Dog Food
  2. #3 Purina Pro Plan Adult Complete Essentials Shredded Blend Chicken & Rice Formula Dry Dog Food
  3. #9 Purina Pro Plan Adult Sensitive Skin & Stomach Salmon & Rice Formula Dry Dog Food
  4. #10 Iams Proactive Health MiniChunks Chicken & Whole Grains Dry Dog Food
  5. #15 Purina One True Instinct with a Blend of Real Turkey & Venison Dry Dog Food
  6. #20 Purina Pro Plan Adult Small Breed Shredded Blend Chicken & Rice Formula Dry Dog Food
  7. #23 Purina Pro Plan Adult Sensitive Skin & Stomach Small Breed Formula Dry Dog Food
  8. #26 Purina Pro Plan Puppy Chicken & Rice Formula 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. Natural Flavor 40%
  3. Mixed Tocopherols 31%
  4. Chicken Fat 31%
  5. Peas 24%
  6. Brown Rice 23%
  7. Carrots 21%
  8. Chicken Meal 20%
  9. Beef 19%
  10. Flaxseed 18%
  11. Dried Plain Beet Pulp 18%
  12. Sweet Potatoes 17%

On the shelf

Foods that list Vitamins

1,285 foods in our catalog list it. These 60 list it highest on the label.

Purina Beyond Mixers+ Immune Support Chicken Bone Broth Dog Food TopperPurinaPurina Beyond Mixers+ Immune Support Chicken Bone Broth Dog Food TopperTopper // No. 2 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. 5 on the labelDave’s Pet Food Restricted Diet Sodium Wet Dog FoodDave's Pet FoodDave’s Pet Food Restricted Diet Sodium Wet Dog FoodWet // No. 6 on the labelEvanger’s Grain Free Braised Beef Chunks with Gravy - packed by hand! Wet Dog FoodEvanger'sEvanger’s Grain Free Braised Beef Chunks with Gravy - packed by hand! Wet Dog FoodWet // No. 6 on the labelTruDog Elevate Smoky BBQ Stew Grain Free Shredded Chicken Stew w/ Sweet Potat Wet Dog FoodTruDogTruDog Elevate Smoky BBQ Stew Grain Free Shredded Chicken Stew w/ Sweet Potat Wet Dog FoodWet // No. 7 on the labelBixbi Rawbble Grain-Free Freeze-Dried Dog FoodBIXBIBixbi Rawbble Grain-Free Freeze-Dried Dog FoodFreeze-Dried // No. 7 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. 7 on the labelHalo Elevate Smoky BBQ Stew Grain Free Shredded Chicken Stew w/ Sweet Potat Wet Dog FoodHaloHalo Elevate Smoky BBQ Stew Grain Free Shredded Chicken Stew w/ Sweet Potat Wet Dog FoodWet // No. 7 on the labelZignature Inception Chicken Recipe Food Can Wet Dog FoodZignatureZignature Inception Chicken Recipe Food Can Wet Dog FoodWet // No. 7 on the labelZignature Inception Pork Recipe Food Can Wet Dog FoodZignatureZignature Inception Pork Recipe Food Can Wet Dog FoodWet // No. 8 on the labelNatural Balance Platefulls Tender Carrot, Potato & Beef Recipe Wet Dog FoodNatural BalanceNatural Balance Platefulls Tender Carrot, Potato & Beef Recipe Wet Dog FoodWet // No. 8 on the labelPurina Pro Plan Sport Adult High Protein Beef & Bison Entrée Classic Wet Dog FoodPurinaPurina Pro Plan Sport Adult High Protein Beef & Bison Entrée Classic Wet Dog FoodWet // No. 8 on the label
Show 48 more
Evanger’s Heritage Classic Lamb & Rice Dinner Wet Dog FoodEvanger'sEvanger’s Heritage Classic Lamb & Rice Dinner Wet Dog FoodWet // No. 6 on the labelEvanger’s Roasted Chicken Drummet Dinner - packed by hand! Grain-Free Wet Dog FoodEvanger'sEvanger’s Roasted Chicken Drummet Dinner - packed by hand! Grain-Free Wet Dog FoodWet // No. 6 on the labelEvanger’s EVX Restricted Diet: Weight Management Wet Dog FoodEvanger'sEvanger’s EVX Restricted Diet: Weight Management Wet Dog FoodWet // No. 6 on the labelEvanger’s Heritage Classic Senior & Weight Management Wet Dog FoodEvanger'sEvanger’s Heritage Classic Senior & Weight Management Wet Dog FoodWet // No. 7 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. 7 on the labelEvanger’s Chunky Chicken Casserole - packed by hand! Wet Dog FoodEvanger'sEvanger’s Chunky Chicken Casserole - packed by hand! 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. 8 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. 8 on the labelZignature Inception Pork Formula Dry Dog FoodZignatureZignature Inception Pork Formula Dry Dog FoodDry // No. 8 on the labelWysong Archetype Burgers Freeze-Dried Raw Dog FoodWysongWysong Archetype Burgers Freeze-Dried Raw Dog FoodFreeze-Dried // No. 8 on the labelWellness Core 95% Turkey & Spinach Grain-Free Wet Dog FoodWellnessWellness Core 95% Turkey & Spinach Grain-Free Wet Dog FoodWet // No. 9 on the labelWellness Core 95% Chicken & Broccoli Grain-Free Wet Dog FoodWellnessWellness Core 95% Chicken & Broccoli Grain-Free Wet Dog FoodWet // No. 9 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. 9 on the labelZignature Essence LIR Landfowl Recipe Food Can Grain-Free Wet Dog FoodZignatureZignature Essence LIR Landfowl Recipe Food Can Grain-Free Wet Dog FoodWet // No. 9 on the labelZignature Inception Fish Recipe Food Can Wet Dog FoodZignatureZignature Inception Fish Recipe Food Can Wet Dog FoodWet // No. 9 on the labelNatural Balance Platefulls Savory Duck & Pumpkin Recipe Wet Dog FoodNatural BalanceNatural Balance Platefulls Savory Duck & Pumpkin Recipe Wet Dog FoodWet // No. 9 on the labelThe Honest Kitchen Tender Turkey One Pot Stew Wet Dog FoodThe Honest KitchenThe Honest Kitchen Tender Turkey One Pot Stew Wet Dog FoodWet // No. 9 on the labelThe Honest Kitchen Slow Cooked Chicken One Pot Stew Wet Dog FoodThe Honest KitchenThe Honest Kitchen Slow Cooked Chicken One Pot Stew Wet Dog FoodWet // No. 9 on the labelInstinct Raw Boost RawBoost+ Mixers Tranquility Recipe Dog Food TopperInstinctInstinct Raw Boost RawBoost+ Mixers Tranquility Recipe Dog Food TopperTopper // No. 9 on the labelPurina Pro Plan Adult 7+ Senior Complete Essentials Chicken & Rice Entrée Classic Wet Dog FoodPurinaPurina Pro Plan Adult 7+ Senior Complete Essentials Chicken & Rice Entrée Classic Wet Dog FoodWet // No. 9 on the labelZignature Select Cuts Turkey Formula with Super Grains Dry Dog FoodZignatureZignature Select Cuts Turkey Formula with Super Grains Dry Dog FoodDry // No. 9 on the labelZignature Inception Fish Formula Dry Dog FoodZignatureZignature Inception Fish Formula Dry Dog FoodDry // No. 9 on the labelWysong Fundamentals Dry Dog FoodWysongWysong Fundamentals Dry Dog FoodDry // No. 9 on the labelPurina Beneful Chicken & Carrots Loaf Wet Dog FoodPurinaPurina Beneful Chicken & Carrots Loaf Wet Dog FoodWet // No. 10 on the labelMerrick Fresh Selects Turkey & Brown Rice Fresh Frozen Dog FoodMerrickMerrick Fresh Selects Turkey & Brown Rice Fresh Frozen Dog FoodFrozen // No. 10 on the labelMerrick Fresh Selects Chicken & Brown Rice Fresh Frozen Dog FoodMerrickMerrick Fresh Selects Chicken & Brown Rice Fresh Frozen Dog FoodFrozen // No. 10 on the labelDave’s Pet Food Bland Diet Pouches Dave’s Bland Duck & Pumpkin Pouch Recipe for Dogs / 10 Pack - Pou Wet Dog FoodDave's Pet FoodDave’s Pet Food Bland Diet Pouches Dave’s Bland Duck & Pumpkin Pouch Recipe for Dogs / 10 Pack - Pou Wet Dog FoodWet // No. 10 on the labelGravy Train Ground Dinner With Chicken Wet Dog FoodGravy TrainGravy Train Ground Dinner With Chicken Wet Dog FoodWet // 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. 10 on the labelZignature Essence LIR Ranch Recipe Food Can Grain-Free Wet Dog FoodZignatureZignature Essence LIR Ranch Recipe Food Can Grain-Free Wet Dog FoodWet // No. 10 on the labelZignature Original Food Lamb Formula Grain-Free Wet Dog FoodZignatureZignature Original Food Lamb Formula Grain-Free Wet Dog FoodWet // No. 10 on the labelZignature Original Food Turkey Formula Grain-Free Wet Dog FoodZignatureZignature Original Food Turkey Formula Grain-Free Wet Dog FoodWet // No. 10 on the labelThe Honest Kitchen Roasted Beef One Pot Stew Wet Dog FoodThe Honest KitchenThe Honest Kitchen Roasted Beef One Pot Stew Wet Dog FoodWet // No. 10 on the labelOpen Farm Icelandic Cod & Herring Grain-Free Wet Dog FoodOpen FarmOpen Farm Icelandic Cod & Herring Grain-Free Wet Dog FoodWet // No. 10 on the labelPedigree Chopped Ground Dinner Adult Pouch, Chicken Wet Dog FoodPedigreePedigree Chopped Ground Dinner Adult Pouch, Chicken Wet Dog FoodWet // No. 10 on the labelPedigree High Protein Chopped Ground Dinner Can, Chicken & Duck Wet Dog FoodPedigreePedigree High Protein Chopped Ground Dinner Can, Chicken & Duck Wet Dog FoodWet // No. 10 on the labelInstinct Freshly Crafted Meals Cage-Free Chicken Recipe Wet Dog FoodInstinctInstinct Freshly Crafted Meals Cage-Free Chicken Recipe Wet Dog FoodWet // No. 10 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. 10 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. 10 on the labelBlue Wilderness Wild Meals Chicken & Sweet Potato Wet Dog FoodBlueBlue Wilderness Wild Meals Chicken & Sweet Potato Wet Dog FoodWet // No. 10 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. 10 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. 10 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. 10 on the labelZignature Essence LIR Landfowl Recipe Dry Dog FoodZignatureZignature Essence LIR Landfowl Recipe Dry Dog FoodDry // No. 10 on the labelZignature Inception Chicken Formula Dry Dog FoodZignatureZignature Inception Chicken Formula Dry Dog FoodDry // No. 10 on the labelZignature Original Turkey Formula with Probiotics Grain-Free Dry Dog FoodZignatureZignature Original Turkey Formula with Probiotics Grain-Free Dry Dog FoodDry // No. 10 on the labelZignature Original Small Bites Turkey Formula with Probiotics Grain-Free Dry Dog FoodZignatureZignature Original Small Bites Turkey Formula with Probiotics Grain-Free Dry Dog FoodDry // No. 10 on the labelRoyal Canin Veterinary Selected Protein PW Moderate Calorie Grain-Free Dry Dog FoodRoyal CaninRoyal Canin Veterinary Selected Protein PW Moderate Calorie Grain-Free Dry Dog FoodDry // No. 10 on the label

Sources

What we read

Checked September 1, 2026.

  1. 1 Effect of dietary antioxidants on free radical damage in dogs and cats Journal of Animal Science, 2024 // Journal
  2. 2 Stability of vitamin A at critical points in pet-feed manufacturing and during premix storage Frontiers in Veterinary Science, 2024 // Journal
  3. 3 DSM Nutritional Products, LLC - 578300 - 10/11/2019 U.S. Food and Drug Administration, 2019 // Government
  4. 4 Vitamin D Toxicity in Dogs U.S. Food and Drug Administration, 2024 // Government
  5. 5 AAFCO Dog and Cat Food Nutrient Profiles Association of American Feed Control Officials, 2014 // Regulator
  6. 6 Reading Labels Association of American Feed Control Officials, n.d. // Regulator
  7. 7 Supplements Association of American Feed Control Officials, n.d. // Regulator
  8. 8 Four components define a well-designed pet food premix PetfoodIndustry, 2026 // Industry
  9. 9 Elvehjem, Conrad Arnold Encyclopedia.com (Complete Dictionary of Scientific Biography), n.d. // Reference
  10. 10 FDA Alerts Pet Owners about Potentially Toxic Levels of Vitamin D in Several Dry Pet Foods U.S. Food and Drug Administration, 2018 // Regulator
  11. 11 FDA Alerts Pet Owners and Veterinarians About Potentially Toxic Levels of Vitamin D in 33 Varieties of Hill's Canned Dog Food in Expanded Recall U.S. Food and Drug Administration, 2019 // Regulator
  12. 12 Oral vitamin D supplementation at five times the recommended allowance marginally affects serum 25-hydroxyvitamin D concentrations in dogs Journal of Nutritional Science, 2016 // Journal
  13. 13 Increased dietary vitamin D was associated with increased circulating vitamin D with no observable adverse effects in adult dogs Frontiers in Veterinary Science, 2023 // Journal
  14. 14 Impacts of vitamin premix and/or yeast ingredient inclusion in a canned cat food on thiamin retention during 6 months of storage Frontiers in Veterinary Science, 2022 // Journal
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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