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Ingredient file // Preservative

Citric Acid

Printed as “Citric Acid For Freshness” on some labels. Same ingredient.

A minor freshness tool with one bloat signal

Citric acid is a purified sour acid usually made by fermenting sugar. In dog food it adjusts acidity and assists antioxidant blends used to protect fats. It supplies no protein, fat or fiber, and its reported link to bloat remains unproven.

What it is
A purified food acid used to adjust acidity and support preservative mixtures.
Made from
Sugar syrup or molasses
Main job
Acidity and freshness control
Typical amount
Not published
Watch for
Uncertain bloat association in high-risk dogs
Not the same as
Potassium citrate

Our read // In our catalog

In 1 of every 9 foods we track

Share of foods that list it

11%

289 of the 2,595 foods with an ingredient list on file, from 29 brands. 269 dry dog food, 15 wet dog food, 5 dog food topper.

Each square is 1% of the catalog

Where it sits on the label

Median position 23. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

5%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 95% of foods.

Price per lb

Foods with it $2.68
All foods $3.23

Median of the cheapest bag price across 208 priced foods, 17% below the catalog. The price is the food's, not the ingredient's.

Who leans on it

14%

of the foods that list it are from Nutro. 29 brands use it in total.

What it is

How it is made

Commercial citric acid usually comes from sugar fermentation, a lower-cost route than extracting it from fruit. Producers recover the acid from the fermentation liquid and crystallize it for use in foods, including preservative mixtures.8

  1. 01 // Source Sugar feedstock Glucose syrup or beet molasses supplies the sugar used in large-scale fermentation.
  2. 02 // Process Fungal fermentation Aspergillus niger grows in the sugary liquid and releases citric acid into it.
  3. 03 // Process Recovered and crystallized Processors separate and purify the acid, then cool the liquid to form crystals.
  4. 04 // Output Citric acid crystals The purified crystals reach food plants as a dry acid for blending into recipes.

What is in it

Composition, dry matter

99.5

% citric acid

The minimum food-grade assay on a dry basis. This is essentially an acid ingredient, with no protein, fat or fiber to offer.

Citric acid assay 99.5-100.5%7
Crude protein 0%6
Fat 0%6
Crude fiber 0%6

The assay range is a testing specification, not measured variation across brands. Citric acid also comes as crystals containing bound water; the dry matter basis removes that difference.6,7

Why it is in the bag

What the manufacturer gets

  1. 01

    Supports fat protection

    Citric acid binds metals that speed oxidation, so manufacturers pair it with antioxidants. The tested citric acid blend in dog snacks performed worse than its comparison formulas.1,9

  2. 02

    Adjusts acidity

    It lowers pH when mixed with water. EFSA found that tests on wet feed mixtures do not reliably show its effect inside dry feed.4

  3. 03

    Supplies affordable scale

    Sugar fermentation produces commercial quantities without extracting fruit juice. Its relatively low production cost makes the acid available for small additions to food mixtures.8

How much EFSA evaluated a proposed use level of 15,000 mg per kg of complete feed; typical amounts in dog foods are not published.3

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. Owners say

    Citric acid in kibble causes bloat

    Outruns the evidence

    Evidence

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

    A case-control study of high-risk breeds linked moistened kibble containing citric acid with 4.19 times the odds of bloat. Owners reported feeding details. The association does not show that citric acid caused it.2

  2. Brands say

    Helps keep fats from going rancid

    Evidence

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

    A 10-week animal-feed storage test favored a blend containing citric acid. In a separate test of 320 dog snacks, a tocopherol, rosemary and citric acid blend had worse oxidative stability than both comparison formulas. Neither result shows that citric acid alone protects fat in dog food.1,5

  3. Brands say

    Citric acid stops spoilage microbes in dry kibble

    Outruns the evidence

    Evidence

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

    EFSA reviewed citric acid as a feed preservative but found its effectiveness insufficiently demonstrated, particularly in dry feed with at most 12% moisture. An antimicrobial role in other foods does not show that it protects kibble by itself.3,9

  4. Owners say

    Citric acid comes from squeezed citrus fruit

    Outruns the evidence

    Evidence

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

    Fruit extraction is possible, but a production review reports that more than 90% of citric acid is made by fermentation. The ingredient name does not reveal which production route supplied the acid.8

  5. Owners say

    Citric acid on the label treats bladder stones

    Outruns the evidence

    Evidence

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

    The supplier lists citric acid and potassium citrate as separate products. FDA lists citric acid for food functions such as pH control and antioxidant use. A food label gives no evidence of a urinary treatment dose.6,9

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    It adds no protein, fat or fiber, but it has a processing job: adjusting acidity and supporting preservative mixtures. AAFCO explains that preservatives belong among the minor ingredients near the end of a list.6,9,10

  2. Q02

    Should I stop soaking kibble?

    Not automatically

    Moistening alone was not linked to bloat in the observational study. The signal concerned moistened foods that also listed citric acid, in breeds already at high risk. That finding cannot tell you whether soaking your dog's food is harmful.2

  3. Q03

    Does it come from lemons?

    Usually no

    Citric acid occurs in citrus fruit, but commercial production usually ferments sugar with Aspergillus niger. Purification leaves the same acid regardless of the starting material, and the label does not name the production route.8

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Nutro 41
  2. Natural Balance 27
  3. Nature's Recipe 21
  4. Acana 21
  5. Simply Nourish 18
  6. Merrick 18
  7. Authority 17
  8. Iams 14
  9. Royal Canin 13
  10. Orijen 13

Plus 19 more brands.

Amazon best sellers that list it

  1. #10 Iams Proactive Health MiniChunks Chicken & Whole Grains Dry Dog Food
  2. #28 Nature’s Recipe Grain-Free Easy to Digest Salmon, Sweet Potato, & Pumpkin Recipe Dry Dog Food
  3. #32 Natural Balance L.I.D. Limited Ingredient Diets Grain-Free Salmon & Sweet Potato Dry Dog Food
  4. #34 Rachael Ray Nutrish Real Chicken & Veggies Recipe Dry Dog Food
  5. #37 Rachael Ray Nutrish Real Beef, Pea & Brown Rice Recipe Dry Dog Food
  6. #50 Iams Adult Minichunks with Lamb & Rice Dry Dog Food
  7. #76 Nutro Natural Choice Adult Chicken & Brown Rice Recipe Dry Dog Food
  8. #87 Iams Adult Healthy Weight 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. Natural Flavor 56%
  2. Chicken Meal 48%
  3. Chicken 46%
  4. Chicken Fat 45%
  5. Brown Rice 31%
  6. Dried Plain Beet Pulp 30%
  7. Flaxseed 27%
  8. Brewers Rice 26%
  9. Peas 21%
  10. Oatmeal 20%
  11. Turkey Meal 20%
  12. Barley 19%

Our read // On the bag

Read it as a minor processing ingredient

Citric acid near the end of an ingredient list is there for acidity or freshness, not nutrition. Judge the food by the proteins and fats earlier on the bag. Do not buy it for urinary benefits or assume that its presence guarantees shelf life. The bloat finding warrants attention, not a verdict of harm.

On labels as

Other names for this

Manufacturers do not all use the same wording. These all mean the same thing.

Citric Acid For Freshness

Sources

What we read

Checked September 1, 2026.

  1. 1 Oxidative stability and quality of snacks for dogs formulated with natural antioxidant Pubvet, 2017 // Journal
  2. 2 Diet -related risk factors for gastric dilatation -volvulus in dogs of high -risk breeds: A nested case-control study Purdue University, n.d. // University
  3. 3 Scientific Opinion on the safety and efficacy of citric acid when used as a technological additive (preservative) for all animal species EFSA Journal, 2016 // Journal
  4. 4 Scientific Opinion on the safety and efficacy of citric acid when used as a technological additive (acidity regulator) for all animal species EFSA Journal, 2015 // Journal
  5. 5 Synergistic Effects of Antioxidant Blends: A Comparative Study on Oxidative Stability of Lipids in Feed Matrices Antioxidants, 2025 // Journal
  6. 6 Nutritional Information for Citric Products Archer Daniels Midland Company, n.d. // Industry
  7. 7 Citric Acid Monohydrate - USP Food Grade Alliance Chemical, 2026 // Industry
  8. 8 An overview of key industrial product citric acid production by Aspergillus niger and its application Journal of Industrial Microbiology and Biotechnology, 2025 // Journal
  9. 9 Substances Added to Food (formerly EAFUS): Citric Acid U.S. Food and Drug Administration, n.d. // Government
  10. 10 What’s in the Ingredients List? AAFCO, n.d. // Regulator
  11. 11 Gastric dilatation volvulus (GDV) or “bloat” Cornell University College of Veterinary Medicine, 2025 // University
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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