Ingredient file // Preservative
Mixed Tocopherols
A useful fat preservative, not a vitamin promise
Mixed tocopherols are antioxidant compounds concentrated from vegetable oils. They slow the reactions that make fats smell stale and lose quality during storage. Their presence on a label does not tell you how much vitamin E the finished food supplies.
- What it is
- A blend of tocopherol compounds from vegetable oils, added mainly to slow fat oxidation.
- Made from
- Vegetable oil refining distillate
- Main job
- Slow fat rancidity
- Typical amount
- About 100 to 450 ppm of fat or oil in foods
- Watch for
- Fats still spoil during warm storage
- Not the same as
- Vitamin E supplement
Our read // In our catalog
In 1 of every 4 foods we track
Share of foods that list it
25%
761 of the 3,105 foods with an ingredient list on file, from 60 brands. 621 dry dog food, 59 dog food topper, 57 freeze-dried dog food.
Each square is 1% of the catalog
Where it sits on the label
Median position 23. In the top five of 9 foods, so it is usually a minor ingredient.
Above the salt
Usually listed after the salt, which caps it at roughly 1% of the recipe in 93% of foods.
Price per lb
Median of the cheapest bag price across 528 priced foods, 3% above the catalog. The price is the food's, not the ingredient's.
Who leans on it
11%
of the foods that list it are from Hill's. 60 brands use it in total.
What it is
How it is made
Refineries remove strong odors and flavors from vegetable oils. The material separated during that step contains tocopherols, which processors concentrate and sell as antioxidants for foods and feeds.3,4
- 01 // Source Vegetable oils Soybean oil is a common source because it is inexpensive; other seed oils also supply tocopherols.
- 02 // Process Oil deodorizing Steam removes unwanted compounds from refined oil, leaving a distillate that includes tocopherols and fatty acids.
- 03 // Process Tocopherols separated Extraction and distillation concentrate the tocopherols while removing much of the other material.
- 04 // Output Antioxidant concentrate The mixture reaches food makers as a liquid, sometimes diluted with vegetable oil or combined with rosemary extract.
What is in it
Composition, dry matter
30-80
% tocopherols
The usual total tocopherol range in commercial concentrates. A label identifies the preservative but gives neither its concentration nor its amount in the food.
Why it is in the bag
What the manufacturer gets
-
01
Slows fat oxidation
Tocopherols react with free radicals before those radicals attack the food's fats. Protection depends on the oil, the recipe, the dose and storage conditions.1,3
-
02
Protects stored flavor
Oxidizing fats develop stale odors and lose quality. Delaying that change helps preserve the food's taste, but tocopherols cannot guarantee freshness throughout storage.1,3
-
03
Uses an oil coproduct
Oil refining already produces tocopherol rich distillate. Inexpensive soybean oil supplies a common starting material, making the preservative available through a large refining industry.3,4
How much A USDA review reports about 100 to 450 ppm based on fat or oil in foods; a kibble experiment tested a 200 ppm tocopherol and rosemary blend.1,3
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.
-
Brands say
Mixed tocopherols slow fat rancidity
Evidence
- Strong
- Some
- Thin
- None
Tocopherols interrupt fat oxidation. In a kibble storage experiment, a 200 ppm tocopherol and rosemary blend did not consistently extend time to oxidation failure across oils. The ingredient has a real job, but its effect depends on the recipe.1,3
-
Brands say
They keep omega-3 oils fresh for months
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
Across treatments in a 15 month kibble experiment, EPA and DHA fell by 98.7% and 77.9% on average. The tested blend did not consistently delay oxidation failure. A mixed tocopherols listing cannot promise lasting omega-3 protection.1
-
Brands say
They supply the vitamin E dogs need
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
One supplier concentrate contained 80.2 g/kg alpha-tocopherol, but that is its concentration before addition to food. The ingredient list gives no finished food dose, so this line cannot show whether the diet meets a dog's vitamin E needs.3,5,6
-
Brands say
They boost a dog's immune health
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A Hill's funded, 84 day trial in 40 dogs measured better blood markers with higher dietary alpha-tocopherol alongside vitamin C and beta-carotene. It did not test mixed tocopherols at preservative doses or measure whether dogs became ill less often.2
-
Owners say
Natural preservatives are safer than synthetic ones
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
Vegetable oil origin describes where the tocopherols came from, not a comparative safety result. A recent feed additive review found tocopherol extracts safe under their authorized conditions, but the kibble experiment included no synthetic preservative safety comparison.1,8
Straight answers
What owners ask
-
Q01
Is it just filler?
NoIt is added for a specific preservation job, not to add bulk. Tocopherols slow the chemical reactions that turn fats rancid, and preservatives are normally minor ingredients on a pet food label.3,6
-
Q02
Why is it near the end?
Small amountIngredients are listed by weight, and AAFCO describes preservatives as minor ingredients. A low position is expected. It does not reveal the preservative dose or the finished food's vitamin E content.3,6
-
Q03
Is it a vitamin E supplement?
NoThe mixture contains compounds in the vitamin E family, including alpha-tocopherol. Here it is listed for preservation. Its name alone provides no amount to count toward your dog's vitamin E intake.3,5,6
-
Q04
Does it stop mold?
NoIts documented job is slowing oxidation of fats. It is not evidence that a food resists mold or bacterial contamination, so use the package's storage directions and discard food with a foul odor.3,7
Who uses it
Brands, best sellers and the company it keeps
Top brands, by foods that list it
Plus 50 more brands.
Amazon best sellers that list it
- #4 Hill’s Science Diet ght Small & Mini Chicken Recipe Dry Dog Food
- #6 Hill’s Science Diet Adult Sensitive Stomach & Skin Chicken Recipe Dry Dog Food
- #7 Stella & Chewy’s Marie’s Magical Dinner Dust Cage-Free Chicken Recipe Freeze-Dried Raw Dog Food Topper
- #10 Iams Proactive Health MiniChunks Chicken & Whole Grains Dry Dog Food
- #13 Hill’s Science Diet Adult 1-6 Small Bites Chicken & Barley Recipe Dry Dog Food
- #21 Hill’s Science Diet Adult 1-6 Chicken & Barley Recipe Dry Dog Food
- #24 Hill’s Science Diet Adult Sensitive Stomach & Skin Small & Mini Chicken Recipe Dry Dog Food
- #25 Instinct Raw Boost Mixers Gut Health Freeze-Dried Dog Food Topper
Rank on Amazon's dog food best seller list, checked October 2026.
Usually listed with, share of the foods that list it
- Chicken Fat 43%
- Chicken Meal 41%
- Flaxseed 37%
- Chicken 36%
- Natural Flavor 34%
- Peas 28%
- Brown Rice 27%
- Dried Plain Beet Pulp 20%
- Sweet Potatoes 18%
- Turkey Meal 16%
- Oatmeal 16%
- Brewers Rice 16%
On the shelf
Foods that list it
761 foods in our reviews list it. Here are some of them.
Show 56 more
Earth Animal Wisdom Air-Dried Chicken Recipe Dog Food Topper30.5% proteinEarth Animal Wisdom Air-Dried From the Air Recipe Dog Food Topper29.3% proteinPure Balance Pro+ Large Breed Chicken & Brown Rice Recipe Dry Dog Food24.4% proteinWysong Original Diets Healthy Aging Dry Dog Food44.4% proteinPure Balance Pro+ Weight Management Chicken & Oatmeal Recipe Dry Dog Food27.2% proteinZignature Select Cuts Trout & Salmon Meal Formula with Super Grains Dry Dog Food31.1% proteinPure Balance Pro+ Sensitive Skin & Stomach , Salmon & Rice Recipe Dry Dog Food27.8% proteinPure Balance Pro+ Small Breed Chicken and Pea Recipe Dry Dog Food28.9% proteinPure Balance Pro+ Senior Salmon & Brown Rice Recipe Dry Dog Food26.7% proteinSimply Nourish Limited Ingredient Diet Limited Ingredient Small Breed Adult Grain-Free Dry Dog Food30.4% proteinBixbi Rawbble Grain-Free Dry Dog Food34.1% proteinOpen Farm Surf & Turf Raw Freeze-Dried Dog Food38.9% proteinAnnamaet Chicken Raw Freeze-Dried Dog Food38.7% proteinAnnamaet Surf & Turf Raw Freeze-Dried Dog Food43.0% proteinStella & Chewy’s Raw Dinner Patties Beef & Salmon Perfectly Puppy Dinner Patties Freeze-Dried Dog Food48.4% proteinStella & Chewy’s Chicken Little Lil’ Bites - Raw for Small Breeds Freeze-Dried Dog Food50.5% proteinDr. Marty Nature’s Blend Premium Origin Freeze-Dried Dog Food40.4% proteinDr. Marty Nature’s Blend Small Breed Freeze-Dried Dog Food42.6% proteinBixbi Liberty Dry Dog Food29.5% proteinBixbi Rawbble ProteinBlend Grain-Free Dry Dog Food30.7% proteinKismet Shakers Daily Hip & Joint Formula Freeze-Dried Chicken Recipe Dog Food Topper26.9% proteinKismet Shakers Daily Multivitamin Formula Freeze-Dried Chicken Recipe Dog Food Topper26.9% proteinWeruva Dogs in the Kitchen Dog Feeling Farmy Chicken, Egg & Pumpkin Dry Grain-Free Freeze-Dried Dog Food53.3% proteinWeruva Dogs in the Kitchen Dog Paw Lickin Grain-Free Freeze-Dried Dog Food73.9% proteinWellness Bowl Boosters Tender Toppers Lamb & Salmon Grain-Free Dog Food Topper16.0% proteinKismet Shakers Daily Skin & Coat Formula Freeze-Dried Beef & Beef Liver Recipe Dog Food Topper26.9% proteinWeruva Dogs in the Kitchen Dog Steak Frites Dinner Beef & Pumpkin Dry Grain-Free Freeze-Dried Dog Food38.0% proteinOpen Farm Pasture-raised Lamb Raw Freeze-Dried Dog Food38.9% proteinOpen Farm Farmer’s Table Pork Raw Freeze-Dried Dog Food46.3% proteinTruDog Freeze-Dried Raw Beef Protein Grain-Free Dog Food Topper48.9% proteinTruDog Freeze-Dried Raw Skin & Coat Grain-Free Dog Food Topper53.3% proteinNutro Natural Choice Adult Large Breed Dry, Salmon & Brown Rice Dry Dog Food24.4% proteinInstinct FreshDried Meal Blends Chicken & Harvest Blend Freeze-Dried Dog Food35.1% proteinInstinct Original Bites for Dogs Pollock Recipe Grain-Free Freeze-Dried Dog Food41.5% proteinBixbi Rawbble Grain-Free Freeze-Dried Dog Food45.2% proteinInstinct FreshDried Raw Meals for Puppies Chicken Recipe Grain-Free Freeze-Dried Dog Food40.4% proteinThe Honest Kitchen Whole Food Clusters Grain Free Chicken Protein Plus Clusters Dry Dog Food36.4% proteinOrijen Tundra Freeze-Dried Dog Food38.5% proteinInstinct FreshDried Meal Blends Beef & Orchard Blend Freeze-Dried Dog Food36.2% proteinNorthwest Naturals Nuggets; Bulk Meal Bars; Chubs Trout Recipe Frozen Dog Food25.0% proteinDr. Marty Nature’s Blend Active Vitality Freeze-Dried Dog Food42.6% proteinNulo Raw Chicken Recipe with Blueberries Freeze-Dried Dog Food42.1% proteinNulo Raw Lamb Recipe with Raspberries Freeze-Dried Dog Food31.6% proteinVital Essentials Raw Entrées Beef Entree Patties Frozen Dog Food53.8% proteinNulo Raw Turkey Recipe with Cranberries Freeze-Dried Dog Food42.1% proteinNulo Raw Duck Recipe with Pears Freeze-Dried Dog Food42.1% proteinNulo Raw Turkey & Salmon Recipe with Strawberries Freeze-Dried Dog Food42.1% proteinNulo Raw Beef Recipe with Apples Freeze-Dried Dog Food31.6% proteinStella & Chewy’s Purely Pork Dinner Patties Freeze-Dried Dog Food42.1% proteinStella & Chewy’s Raw Puppy Patties Chicken & Salmon Perfectly Puppy Dinner Patties Freeze-Dried Dog Food50.5% proteinVital Essentials Rabbit Mini Patties Freeze-Dried Dog Food59.8% proteinVital Essentials Soft Nibs Beef Freeze-Dried Dog Food43.5% proteinDr. Marty Nature’s Blend Healthy Growth Freeze-Dried Dog Food42.6% proteinStella & Chewy’s Itty Bitty Beef Lil’ Bites - Raw for Small Breeds Freeze-Dried Dog Food38.9% proteinSmallbatch Lamb Sliders Freeze-Dried Dog Food43.1% proteinSmallbatch Lamb Small Bites Freeze-Dried Dog Food43.6% proteinOur read // On the bag
Read it as protection for the fats
Mixed tocopherols near the end of an ingredient list are doing a useful preservation job. Pay closer attention to the fats in the recipe, the date on the bag and how you store it. This line alone proves neither adequate vitamin E nutrition nor a safety advantage over other preservatives.
On labels as
For freshness and natural mixed tocopherols compared
One page covers every name. Here is what each label word adds, and whether it changes anything for your dog.
Mixed tocopherols for freshness
Matters for your dog No
Mixed Tocopherols Added To Preserve Freshness · Mixed Tocopherols For Freshness
What it means FDA labeling rules for animal food require any added chemical preservative to be listed by name along with what it does, such as preserving or protecting flavor. A freshness phrase meets that rule. It does not promise a shelf life or a dose.
For your dog Nothing changes for the dog. These are the same tocopherols as the plain name, and the phrase is a required statement of purpose. Fats can still go rancid in storage, so check the date and keep the bag cool and dry.1,7,9
Natural mixed tocopherols
Matters for your dog A little
Natural Mixed Tocopherols
What it means AAFCO defines natural as coming only from plant, animal or mined sources, with physical processing, extraction or purification allowed but no chemically synthetic process. USDA organic rules list tocopherols from vegetable oil among allowed synthetics, so plant origin alone does not settle the claim.
For your dog The word is a claim about how the tocopherols were processed, not proof of a benefit. We found no study showing natural labeled tocopherols keep fats fresher or are safer for dogs than other preservatives, and fats still oxidized in a kibble storage test.1,10,11
Sources
What we read
Checked September 1, 2026.
- 1 Lipid source and kibble matrix determine oxidative stability and n-3 fatty acid loss in coated extruded dog food
- 2 Effect of dietary antioxidants on free radical damage in dogs and cats
- 3 Tocopherols: Handling/Processing Technical Evaluation Report
- 4 National Organic Standards Board Proposals and Discussion Documents October 2024
- 5 GRAS Notice (GRN) No. 761, Esterified propoxylated glycerol
- 6 What's in the Ingredients List?
- 7 Proper Storage of Pet Food & Treats
- 8 Commission Implementing Regulation (EU) 2026/2084
- 9 21 CFR 501.22, Animal foods; labeling of spices, flavorings, colorings, and chemical preservatives
- 10 Natural
- 11 7 CFR 205.605, Nonagricultural (nonorganic) substances allowed as ingredients in or on processed products labeled as "organic" or "made with organic"