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Ingredient file // Preservative

Lactic Acid

A processing acid with modest safety evidence

Lactic acid is a purified acid commonly made by fermenting sugar. In dog food it adjusts acidity and can help control bacteria under tested processing conditions. It is not a probiotic, and its name does not mean it contains milk.

Role in the food Does a job
What it is
A purified organic acid added to food to adjust acidity and help limit bacterial growth.
Made from
Fermented sugar, including corn sugar
Main job
Acidity and microbial control
Typical amount
Not published
Watch for
It does not make raw food sterile
Not the same as
Live probiotic cultures

Straight answer

Is Lactic Acid safe for dogs?

Read it as a processing ingredient

Lactic acid low on the list tells you little about the meat, grain or fat above it. Check those main ingredients and the food's nutritional adequacy. If the product is raw or frozen, ask the maker how it controls pathogens. The acid's presence alone does not answer that.

Why it is in the food
Acidity and microbial control

Our read // In our catalog

In 1 of every 14 foods we track

Share of foods that list it

7%

236 of the 3,204 foods with an ingredient list on file, from 11 brands. 204 dry dog food, 21 frozen dog food, 6 dog food topper.

Each square is 1% of the catalog

Where it sits on the label

Median position 18. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

47%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 53% of foods.

Price per lb

Foods with it $3.00
All foods $3.25

Median of the cheapest bag price across 177 priced foods, 8% below the catalog. The price is the food's, not the ingredient's.

Who leans on it

35%

of the foods that list it are from Hill's. 11 brands use it in total.

What it is

How it is made

Fermentation plants use sugar as the raw material for making lactic acid. They separate the acid from the fermentation mixture, purify it and ship it as a concentrated liquid for measured use in food.6

  1. 01 // Source Corn sugar One supplier starts with dextrose made from corn rather than milk.
  2. 02 // Process Fermentation Selected bacteria consume the sugar and produce lactic acid.
  3. 03 // Process Purification Ion exchange removes material left from fermentation before the acid is concentrated.
  4. 04 // Output Concentrated acid The food grade ingredient arrives as an 80% or 88% solution in water for addition during food production.

What is in it

Composition, as fed

0

% protein

A food grade product analysis lists no protein. This ingredient changes the food's acidity rather than adding meatlike nutrition.

Protein 0%7
Total fat 0%7
Dietary fiber 0%7
Ash 0%7

These figures are per 100 g of an 88% acid solution, as delivered to the plant. The zeros do not mean calorie free: the same sheet lists 320 kcal per 100 g, coming from the acid itself.6,7

Why it is in the bag

A processing acid, not nutrition and not filler

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

Makers add lactic acid to set a food's acidity and tartness. In raw and coated foods they also use it to help hold down bacteria such as Salmonella. It adds no protein, fat or fiber. Labels list ingredients by weight, and it often sits well down the list, so the amount is likely small. It does a technical job and adds no nutrition, but it is not cheap bulk either.1,7,8,9

  1. 01

    Helps control bacteria

    Adding acid lowers pH. In a challenge test of model raw dog food, citric and lactic acid treatments cut Salmonella more than glucono delta lactone did, at 1.0 to 3.0% of the diet.1

  2. 02

    Adjusts acidity and flavor

    A measured addition lets manufacturers set acidity and add tartness. A company patent's dog preference results varied with the amount applied to kibble.6,8

  3. 03

    Supplies acid in bulk

    Suppliers ship concentrated liquid in drums and tanks. Food plants can dose it directly without running a fermentation process for each recipe.6

  4. 04

    Fits standard feed practice

    US regulations recognize lactic acid for animal feed when manufacturers use it according to good manufacturing or feeding practice.3

How much Raw dog food experiments tested 1 to 3% formulated acidulant; a company patent tested kibble coatings from 0.13 to 3%.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

    Lactic acid kills Salmonella in raw food

    Outruns the evidence

    Evidence

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

    A laboratory challenge of model raw dog food found citric and lactic acid cut Salmonella more than glucono delta lactone, not plain untreated food. Encapsulated lactic acid at 1.0% was not significantly better than dry-plated. The study measured bacteria in food, not dog infections.1

  2. Brands say

    Lactic acid makes kibble taste better

    Outruns the evidence

    Evidence

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

    A company's patent reports mixed dog preference tests: a 0.5% surface treatment drew 76% preference, while a 1% treatment drew 39%. Those results do not support a general taste benefit.8

  3. Brands say

    Lactic acid improves a dog's gut bacteria

    Outruns the evidence

    Evidence

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

    No dog study we found fed purified lactic acid and measured gut bacteria. The trial people point to fed live lactic acid bacteria to 5 beagles for 7 days, a different ingredient. It says nothing about the acid.2

  4. Owners say

    Lactic acid triggers a milk allergy

    Outruns the evidence

    Evidence

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

    The name does not identify milk as its source: one supplier ferments corn sugar, and a food grade analysis lists 0 protein. A milk allergy concerns milk proteins; lactic acid itself does not contain them.5,6,7

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    It has a processing job: adjusting acidity and helping control bacteria under tested conditions. It contributes no protein, fat or fiber, so judge the food's nutrition by its substantial ingredients and adequacy statement.1,7

  2. Q02

    Is it made from milk?

    Not necessarily

    One commercial source starts with corn sugar. The ingredient name describes the finished acid, and purified lactic acid is different from a lactic acid starter culture, which may contain milk.5,6

  3. Q03

    Is lactic acid safe?

    Yes, as used

    US animal feed regulations recognize lactic acid as safe when used according to good manufacturing or feeding practice. A label does not disclose the dose, so it cannot tell you whether a particular recipe was made well.3

  4. Q04

    Does it make raw food safe?

    No

    Acid treatments reduced Salmonella more than glucono delta lactone in a model raw dog food test, but a reduction is not a guarantee that a finished food is free of pathogens. CDC advises careful storage and cleaning when handling raw pet food.1,4

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Hill's 82 / 116
  2. NutriSource 66 / 91
  3. Instinct 27 / 98
  4. Nature's Recipe 20 / 24
  5. Natural Balance 12 / 48
  6. Rachael Ray Nutrish 11 / 19
  7. Kibbles n Bits 6 / 11
  8. Blue 5 / 186
  9. Pure Balance 4 / 17
  10. Heed Foods 2 / 2

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

Plus 1 more brand.

Amazon best sellers that list it

  1. #4 Hill’s Science Diet Light Small & Mini Chicken Recipe Dry Dog Food
  2. #6 Hill’s Science Diet Adult Sensitive Stomach & Skin Chicken Recipe Dry Dog Food
  3. #13 Hill’s Science Diet Adult 1-6 Small Bites Chicken & Barley Recipe Dry Dog Food
  4. #21 Hill’s Science Diet Adult 1-6 Chicken & Barley Recipe Dry Dog Food
  5. #24 Hill’s Science Diet Adult Sensitive Stomach & Skin Small & Mini Chicken Recipe Dry Dog Food
  6. #28 Nature’s Recipe Grain-Free Easy to Digest Salmon, Sweet Potato, & Pumpkin Recipe Dry Dog Food
  7. #34 Rachael Ray Nutrish Real Chicken & Veggies Recipe Dry Dog Food
  8. #37 Rachael Ray Nutrish Real Beef, Pea & Brown Rice Recipe 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 Meal 50%
  2. Chicken 49%
  3. Chicken Fat 45%
  4. Brown Rice 44%
  5. Brewers Rice 31%
  6. Cracked Pearled Barley 27%
  7. Flaxseed 21%
  8. Barley 19%
  9. Dried Plain Beet Pulp 19%
  10. Peas 19%
  11. Natural Chicken Liver Flavor 19%
  12. Mixed Tocopherols 19%

On the shelf

Foods that list Lactic Acid

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

Hill’s Prescription Diet i/d Sensitive Digestive Care Rice & Egg Formula Dry Dog FoodHill'sHill’s Prescription Diet i/d Sensitive Digestive Care Rice & Egg Formula Dry Dog FoodDry // No. 7 on the labelInstinct Raw Boost Mixers Mobility Support Freeze-Dried Dog Food TopperInstinctInstinct Raw Boost Mixers Mobility Support Freeze-Dried Dog Food TopperTopper // No. 7 on the labelInstinct Raw Boost RawBoost+ Frozen Mixers Gut Health Recipe Dog Food TopperInstinctInstinct Raw Boost RawBoost+ Frozen Mixers Gut Health Recipe Dog Food TopperTopper // No. 8 on the labelHill’s Prescription Diet j/d Joint Care Small Bites Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet j/d Joint Care Small Bites Chicken Flavor Dry Dog FoodDry // No. 10 on the labelHill’s Healthy Advantage Adult Oral+ Chicken Flavor Dry Dog FoodHill'sHill’s Healthy Advantage Adult Oral+ Chicken Flavor Dry Dog FoodDry // No. 11 on the labelHill’s Healthy Advantage Adult Small Bites Chicken & Brown Rice Recipe Dry Dog FoodHill'sHill’s Healthy Advantage Adult Small Bites Chicken & Brown Rice Recipe Dry Dog FoodDry // No. 12 on the labelHill’s Bioactive Recipe Adult 7+ Small Breed Thrive + Vigor Dry Dog FoodHill'sHill’s Bioactive Recipe Adult 7+ Small Breed Thrive + Vigor Dry Dog FoodDry // No. 13 on the labelHill’s Bioactive Recipe Adult 7+ Thrive + Vigor Dry Dog FoodHill'sHill’s Bioactive Recipe Adult 7+ Thrive + Vigor Dry Dog FoodDry // No. 13 on the label
Show 52 more
Instinct Raw Boost RawBoost+ Mixers Tranquility Recipe Dog Food TopperInstinctInstinct Raw Boost RawBoost+ Mixers Tranquility Recipe Dog Food TopperTopper // No. 8 on the labelInstinct Raw Boost Mixers All Natural Beef Recipe Freeze-Dried Dog Food TopperInstinctInstinct Raw Boost Mixers All Natural Beef Recipe Freeze-Dried Dog Food TopperTopper // No. 9 on the labelHill’s Prescription Diet d/d Skin/Food Sensitivities Potato & Salmon Formula Grain-Free Dry Dog FoodHill'sHill’s Prescription Diet d/d Skin/Food Sensitivities Potato & Salmon Formula Grain-Free Dry Dog FoodDry // No. 10 on the labelHill’s Prescription Diet d/d Skin/Food Sensitivities Potato & Venison Formula Grain-Free Dry Dog FoodHill'sHill’s Prescription Diet d/d Skin/Food Sensitivities Potato & Venison Formula Grain-Free Dry Dog FoodDry // No. 10 on the labelInstinct Raw Boost Frozen Mixers Skin & Coat Health Dog Food TopperInstinctInstinct Raw Boost Frozen Mixers Skin & Coat Health Dog Food TopperTopper // No. 10 on the labelInstinct Raw Longevity Patties Cage-Free Chicken Recipe Frozen Dog FoodInstinctInstinct Raw Longevity Patties Cage-Free Chicken Recipe Frozen Dog FoodFrozen // No. 11 on the labelInstinct Raw Longevity Bites Cage-Free Chicken Recipe Grain-Free Frozen Dog FoodInstinctInstinct Raw Longevity Bites Cage-Free Chicken Recipe Grain-Free Frozen Dog FoodFrozen // No. 11 on the labelInstinct Raw Signature Patties Real Chicken Recipe Frozen Dog FoodInstinctInstinct Raw Signature Patties Real Chicken Recipe Frozen Dog FoodFrozen // No. 11 on the labelInstinct Raw Signature Bites Real Chicken Recipe Frozen Dog FoodInstinctInstinct Raw Signature Bites Real Chicken Recipe Frozen Dog FoodFrozen // No. 11 on the labelInstinct Raw Patties Cage-Free Chicken Recipe Frozen Dog FoodInstinctInstinct Raw Patties Cage-Free Chicken Recipe Frozen Dog FoodFrozen // No. 11 on the labelInstinct Raw Bites Cage-Free Chicken Recipe for Seniors Frozen Dog FoodInstinctInstinct Raw Bites Cage-Free Chicken Recipe for Seniors Frozen Dog FoodFrozen // No. 11 on the labelInstinct Raw Bites Cage-Free Chicken Recipe Frozen Dog FoodInstinctInstinct Raw Bites Cage-Free Chicken Recipe Frozen Dog FoodFrozen // No. 11 on the labelHill’s Prescription Diet r/d Weight Reduction Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet r/d Weight Reduction Chicken Flavor Dry Dog FoodDry // No. 11 on the labelHill’s Prescription Diet Derm Complete Original Flavor Dry Dog FoodHill'sHill’s Prescription Diet Derm Complete Original Flavor Dry Dog FoodDry // No. 11 on the labelHill’s Science Diet Puppy Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodHill'sHill’s Science Diet Puppy Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodDry // No. 12 on the labelHill’s Prescription Diet k/d + Derm Complete Rice & Egg Recipe Dry Dog FoodHill'sHill’s Prescription Diet k/d + Derm Complete Rice & Egg Recipe Dry Dog FoodDry // No. 12 on the labelInstinct Raw Longevity Bites Grass-Fed Lamb Recipe Frozen Dog FoodInstinctInstinct Raw Longevity Bites Grass-Fed Lamb Recipe Frozen Dog FoodFrozen // No. 12 on the labelInstinct Raw Longevity Bites Grass-Fed Beef Recipe Grain-Free Frozen Dog FoodInstinctInstinct Raw Longevity Bites Grass-Fed Beef Recipe Grain-Free Frozen Dog FoodFrozen // No. 12 on the labelInstinct Raw Signature Patties Real Beef Recipe Frozen Dog FoodInstinctInstinct Raw Signature Patties Real Beef Recipe Frozen Dog FoodFrozen // No. 12 on the labelInstinct Raw Signature Bites Real Lamb Recipe Frozen Dog FoodInstinctInstinct Raw Signature Bites Real Lamb Recipe Frozen Dog FoodFrozen // No. 12 on the labelInstinct Raw Signature Bites Real Beef Recipe Frozen Dog FoodInstinctInstinct Raw Signature Bites Real Beef Recipe Frozen Dog FoodFrozen // No. 12 on the labelInstinct Raw Patties Real Beef Recipe Frozen Dog FoodInstinctInstinct Raw Patties Real Beef Recipe Frozen Dog FoodFrozen // No. 12 on the labelInstinct Raw Bites Grass-Fed Lamb Recipe Grain-Free Frozen Dog FoodInstinctInstinct Raw Bites Grass-Fed Lamb Recipe Grain-Free Frozen Dog FoodFrozen // No. 12 on the labelInstinct Raw Bites Real Beef Recipe Grain-Free Frozen Dog FoodInstinctInstinct Raw Bites Real Beef Recipe Grain-Free Frozen Dog FoodFrozen // No. 12 on the labelHill’s Healthy Advantage Adult Chicken & Brown Rice Recipe Dry Dog FoodHill'sHill’s Healthy Advantage Adult Chicken & Brown Rice Recipe Dry Dog FoodDry // No. 12 on the labelHill’s Prescription Diet c/d Multicare Urinary Care Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet c/d Multicare Urinary Care Chicken Flavor Dry Dog FoodDry // No. 12 on the labelHill’s Prescription Diet w/d Multi-Benefit Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet w/d Multi-Benefit Chicken Flavor Dry Dog FoodDry // No. 12 on the labelHill’s Prescription Diet z/d Skin/Food Sensitivities Small Bites Original Flavor Dry Dog FoodHill'sHill’s Prescription Diet z/d Skin/Food Sensitivities Small Bites Original Flavor Dry Dog FoodDry // No. 12 on the labelHill’s Science Diet Adult 6+ Large Breed Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodHill'sHill’s Science Diet Adult 6+ Large Breed Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodDry // No. 12 on the labelHill’s Science Diet Adult Large Breed Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodHill'sHill’s Science Diet Adult Large Breed Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodDry // No. 12 on the labelHill’s Science Diet Adult 1-6 Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodHill'sHill’s Science Diet Adult 1-6 Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodDry // No. 12 on the labelHill’s Science Diet Adult Small Bites No Corn, Wheat, Soy Chicken & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Small Bites No Corn, Wheat, Soy Chicken & Brown Rice Recipe Dry Dog FoodDry // No. 12 on the labelHill’s Science Diet Adult Sensitive Stomach & Skin Chicken Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Sensitive Stomach & Skin Chicken Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Sensitive Stomach & Skin Small & Mini Chicken Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Sensitive Stomach & Skin Small & Mini Chicken Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult 7+ Chicken Meal, Barley & Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Adult 7+ Chicken Meal, Barley & Rice Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Puppy Small Bites Chicken & Barley Recipe Dry Dog FoodHill'sHill’s Science Diet Puppy Small Bites Chicken & Barley Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Sensitive Stomach & Skin Chicken & Barley Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Sensitive Stomach & Skin Chicken & Barley Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Prescription Diet i/d Puppy Chicken Flavor Digestive Care Dry Dog FoodHill'sHill’s Prescription Diet i/d Puppy Chicken Flavor Digestive Care Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Sensitive Stomach & Skin Pollock Meal & Insect Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Sensitive Stomach & Skin Pollock Meal & Insect Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Bioactive Recipe Adult 6+ Large Breed Thrive + Vigor Dry Dog FoodHill'sHill’s Bioactive Recipe Adult 6+ Large Breed Thrive + Vigor Dry Dog FoodDry // No. 13 on the labelHill’s Prescription Diet k/d + Mobility Kidney + Joint Care Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet k/d + Mobility Kidney + Joint Care Chicken Flavor Dry Dog FoodDry // No. 13 on the labelHill’s Prescription Diet g/d Aging Care Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet g/d Aging Care Chicken Flavor Dry Dog FoodDry // No. 13 on the labelHill’s Prescription Diet i/d Digestive Care Small Bites Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet i/d Digestive Care Small Bites Chicken Flavor Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Puppy Large Breed Chicken Meal & Oats Recipe Dry Dog FoodHill'sHill’s Science Diet Puppy Large Breed Chicken Meal & Oats Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Light Small Bites with Chicken Meal & Barley Dry Dog FoodHill'sHill’s Science Diet Adult Light Small Bites with Chicken Meal & Barley Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Small Paws Lamb Meal & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Small Paws Lamb Meal & Brown Rice Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Light with Chicken Meal & Barley Dry Dog FoodHill'sHill’s Science Diet Adult Light with Chicken Meal & Barley Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult 1-6 Small Bites Lamb Meal & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Adult 1-6 Small Bites Lamb Meal & Brown Rice Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult 1-6 Lamb Meal & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Adult 1-6 Lamb Meal & Brown Rice Recipe Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Large Breed Light with Chicken Meal & Barley Dry Dog FoodHill'sHill’s Science Diet Adult Large Breed Light with Chicken Meal & Barley Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Adult Small Paws Light with Chicken Meal & Barley Dry Dog FoodHill'sHill’s Science Diet Adult Small Paws Light with Chicken Meal & Barley Dry Dog FoodDry // No. 13 on the labelHill’s Science Diet Puppy Chicken Meal & Barley Recipe Dry Dog FoodHill'sHill’s Science Diet Puppy Chicken Meal & Barley Recipe Dry Dog FoodDry // No. 13 on the label

Sources

What we read

Checked October 1, 2026.

  1. 1 Application of Encapsulated and Dry-plated Food Acidulants to Control Salmonella enterica in Raw Meat-based Diets for Dogs Journal of Food Protection, 2023 // Journal
  2. 2 Alteration of the canine small-intestinal lactic acid bacterium microbiota by feeding of potential probiotics Applied and Environmental Microbiology, 2006 // Journal
  3. 3 21 CFR § 582.1061 Lactic acid U.S. Government Publishing Office, 2025 // Government
  4. 4 About Pet Food Safety Centers for Disease Control and Prevention, 2025 // Government
  5. 5 Milk Allergy Food Allergy Research & Education, n.d. // Nonprofit
  6. 6 Lactic Acid Shandong Golden Corn Co., Ltd., n.d. // Industry
  7. 7 Nutritional Data US Jungbunzlauer Inc., 2021 // Industry
  8. 8 PET FOOD COMPOSITION HAVING ANTIMICROBIAL ACTIVITY European Patent Office, 2016 // Industry
  9. 9 Animal Food Labeling and Pet Food Claims U.S. Food and Drug Administration, 2025 // Regulator
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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