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Ingredient file // Fat or oil

Marine Microalgae Oil

A useful omega source with narrow promises

Marine microalgae oil is extracted from microorganizms grown in tanks. It supplies DHA and, in some versions, EPA, the omega-3 fats also found in fish oil. Dogs absorb them, but the ingredient name alone promises no joint or brain benefit.

Role in the food Supporting nutrient
What it is
Oil extracted from cultivated marine microorganizms and added to dog food for its long-chain omega-3 fats.
Made from
Cultivated Schizochytrium cells
Main job
Supply marine omega-3 fats
Typical amount
Up to 1.5% in an FDA-reviewed use
Watch for
Omega-3 loss during storage
Not the same as
Dried whole microalgae

Straight answer

Is Marine Microalgae Oil safe for dogs?

Look for stated DHA and EPA amounts

Marine microalgae oil low on the ingredient list is a purposeful omega-3 addition. Read the foods and fats around it, then look for stated DHA and EPA amounts, especially in puppy food. Its presence identifies a source, not the dose or proof of a joint or brain benefit.

Why it is in the food
Supply marine omega-3 fats

Our read // In our catalog

In 1 of every 23 foods we track

Share of foods that list it

4%

138 of the 3,204 foods with an ingredient list on file, from 19 brands. 61 wet dog food, 60 dry dog food, 12 dog food topper.

Each square is 1% of the catalog

Where it sits on the label

Median position 16. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

18%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 82% of foods.

Price per lb

Foods with it $3.92
All foods $3.25

Median of the cheapest bag price across 71 priced foods, 21% above 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 Annamaet. 19 brands use it in total.

What it is

How it is made

Fermentation plants grow marine microorganizms specifically for the oil inside their cells. The cells are broken open and the oil recovered before it moves on to food makers.6

  1. 01 // Source Marine culture Selected Schizochytrium cells grow in tanks supplied with nutrients rather than being harvested from the sea.
  2. 02 // Process Fermented The culture multiplies through fermentation inside tanks until it reaches a high cell density.
  3. 03 // Process Cells lysed Processors break open the cells, a step that frees the oil held inside them.
  4. 04 // Process Oil recovered The oil phase is recovered from the broken cells and moves on toward food manufacturers.
  5. 05 // Output Algal oil The liquid oil arrives as a concentrated DHA source; its EPA content depends on the strain and product.

What is in it

Composition, dry matter

42

% DHA

About 42% of one tested algal oil was DHA. Another oil can have a different DHA and EPA balance.

DHA 41.7-43%7
EPA 0.4-0.5%7
Palmitic acid 15.5-16.4%7
Linoleic acid 7.5-9.1%7
Triglycerides 92.1-94.5%7

These ranges come from 3 batches of a nearly water-free DHA-rich oil, not the oil tested in dogs. The batch fed to dogs held about 400 mg DHA and 125 mg EPA per gram of oil.1,7

Why it is in the bag

A small amount carrying real omega-3 fats

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

Makers add it to supply DHA and EPA without relying on fish. It often sits low on the list, which is ordered by weight, so it is likely a small share of the food. A concentrated oil does not need bulk to count: the oil fed to dogs held 525 mg DHA plus EPA per gram, and blood DHA rose even at 0.75% of the diet. The dose in any one bag is unstated.1,6,9

  1. 01

    Adds absorbed omega-3s

    Dogs fed increasing amounts of algal oil had more DHA and EPA in their blood. Manufacturers use it to supply these fats directly in the finished food.1,6

  2. 02

    Offers a fish-free supply

    Tank cultivation gives makers a source that does not depend on wild-caught fish. An industry report found algal oil generally costs more to produce, though the price gap narrows when fish oil prices spike.8

  3. 03

    Adds fat to kibble

    Algal oil contributes fat as well as omega-3s. In the dog feeding study, it replaced part of the chicken fat coating on the kibble.1

How much An FDA-reviewed use is up to 1.5% of dry food; a dog study tested 0.75% to 3% on a dry matter basis.1,6

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

    Algal oil gives dogs usable DHA and EPA

    Evidence

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

    Blood DHA and EPA rose with the oil dose in a supplier-funded, 43-week feeding study of mothers and puppies. That shows absorption from the tested oil, not a health benefit from an unstated amount in another food.1,2,6

  2. Brands say

    It eases arthritis like fish oil

    Outruns the evidence

    Evidence

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

    A review found improvement in 6 dog arthritis trials using EPA- and DHA-rich diets or supplements. Algal oil can deliver those fats, but those trials do not show that its presence on a label supplies a therapeutic dose.1,4

  3. Brands say

    Its DHA makes puppies smarter

    Outruns the evidence

    Evidence

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

    In a 12-puppy trial, dogs given DHA-rich fish oil answered one learning task correctly about 70% of the time versus 63% for controls. The trial did not test algal oil, used a small group, and a coauthor worked for the supplement supplier.3

  4. Brands say

    Algal oil stays fresh longer than fish oil

    Outruns the evidence

    Evidence

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

    A 15-month kibble experiment tested both oils but did not report a direct shelf-life ranking between them in its abstract. Algal oil was among the oils that oxidized faster than poultry fats, so a blanket advantage is unproved.5

  5. Critics say

    Algal oil is just filler

    Outruns the evidence

    Evidence

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

    In a controlled dog feeding study, blood DHA and EPA increased as dietary algal oil increased. That is a measurable nutrient contribution, though the ingredient list does not disclose the amount delivered by any particular bag.1,9

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    It supplies DHA, and the oil tested in dogs also carried substantial EPA, about 125 mg per gram of oil. Those fats reached dogs' blood in a feeding study. The amount in your bag stays unknown unless the maker states DHA and EPA content.1,9

  2. Q02

    Is it the same as fish oil?

    Same target fats

    Both can supply DHA and EPA, but their proportions vary. One tested algal oil had very little EPA, while the oil studied in dogs had much more. Compare stated DHA and EPA amounts.1,7

  3. Q03

    Does a low listing matter?

    Usually expected

    Ingredients appear in descending weight order. A concentrated oil meant to add omega-3s need not sit high on the list. Its position cannot tell you the finished food's DHA or EPA amount.6,9

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Annamaet 20 / 20
  2. NutriSource 18 / 91
  3. Go! Solutions 17 / 46
  4. Zignature 17 / 46
  5. Now Fresh 16 / 35
  6. Royal Canin 14 / 160
  7. Caru 9 / 9
  8. Koha 6 / 29
  9. Rachael Ray Nutrish 4 / 19
  10. Wellness 3 / 118

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

Plus 9 more brands.

Amazon best sellers that list it

  1. #75 Royal Canin Small Puppy Dry Dog Food
  2. #78 Zignature Original Lamb Formula with Probiotics Grain-Free 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 43%
  2. Peas 30%
  3. Carrots 27%
  4. Chicken 26%
  5. Mixed Tocopherols 26%
  6. Flaxseed 25%
  7. Tapioca 22%
  8. Chicken Fat 22%
  9. Sunflower Oil 20%
  10. Pumpkin 20%
  11. Chicken Broth 17%
  12. Brown Rice 17%

On the shelf

Foods that list Marine Microalgae Oil

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

Now Fresh Chicken & Broth Wet Food for Small Breed Dogs Grain-Free Wet Dog FoodNow FreshNow Fresh Chicken & Broth Wet Food for Small Breed Dogs Grain-Free Wet Dog FoodWet // No. 7 on the labelRayne Nutrition Rabbit-Maint Paté Wet Dog FoodRayne NutritionRayne Nutrition Rabbit-Maint Paté Wet Dog FoodWet // No. 7 on the labelBrutus Broth Skin & Coat Vegetarian Bone Broth Dog Food TopperBrutus BrothBrutus Broth Skin & Coat Vegetarian Bone Broth Dog Food TopperTopper // No. 9 on the labelCaru Classics (Natural Stews) Classics Chicken Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Chicken Stew Grain-Free Wet Dog FoodWet // No. 10 on the labelNow Fresh Chicken & Rice Ground with Grains Wet Dog FoodNow FreshNow Fresh Chicken & Rice Ground with Grains Wet Dog FoodWet // No. 11 on the labelCaru Classics (Natural Stews) Classics Turkey Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Turkey Stew Grain-Free Wet Dog FoodWet // No. 11 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. 11 on the labelNutriSource Chicken & Duck Recipe Freeze-Dried Dog FoodNutriSourceNutriSource Chicken & Duck Recipe Freeze-Dried Dog FoodFreeze-Dried // No. 12 on the labelKoha Limited Ingredient Bland Diet Chicken & Rice Recipe Wet Dog FoodKohaKoha Limited Ingredient Bland Diet Chicken & Rice Recipe Wet Dog FoodWet // No. 12 on the labelGo! Solutions Tranquility Minced Chicken with Gravy Grain-Free Dog Food TopperGo! SolutionsGo! Solutions Tranquility Minced Chicken with Gravy Grain-Free Dog Food TopperTopper // No. 12 on the labelGo! Solutions Joint Care Chicken, Salmon + Duck Pâté Grain-Free Dog Food TopperGo! SolutionsGo! Solutions Joint Care Chicken, Salmon + Duck Pâté Grain-Free Dog Food TopperTopper // No. 12 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. 12 on the label
Show 48 more
Caru Classics (Natural Stews) Classics Turkey with Lamb Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Turkey with Lamb Stew Grain-Free Wet Dog FoodWet // No. 12 on the labelZignature Inception Chicken Recipe Food Can Wet Dog FoodZignatureZignature Inception Chicken Recipe Food Can Wet Dog FoodWet // No. 12 on the labelNow Fresh Good Gravy Beef & Lamb Grain-Free Wet Dog FoodNow FreshNow Fresh Good Gravy Beef & Lamb Grain-Free Wet Dog FoodWet // No. 12 on the labelNutriSource Prairie Select Grain-Free Wet Dog FoodNutriSourceNutriSource Prairie Select Grain-Free Wet Dog FoodWet // No. 12 on the labelSimply Nourish Homestyle Adult Wet Dog FoodSimply NourishSimply Nourish Homestyle Adult Wet Dog FoodWet // No. 12 on the labelRoyal Canin Veterinary Satiety Support Weight Management Dry Dog FoodRoyal CaninRoyal Canin Veterinary Satiety Support Weight Management Dry Dog FoodDry // No. 12 on the labelNutriSource Beef & Lamb Recipe Freeze-Dried Dog FoodNutriSourceNutriSource Beef & Lamb Recipe Freeze-Dried Dog FoodFreeze-Dried // No. 13 on the labelAnnamaet Chicken Raw Freeze-Dried Dog FoodAnnamaetAnnamaet Chicken Raw Freeze-Dried Dog FoodFreeze-Dried // No. 13 on the labelAnnamaet Turkey Raw Freeze-Dried Dog FoodAnnamaetAnnamaet Turkey Raw Freeze-Dried Dog FoodFreeze-Dried // No. 13 on the labelCaru Daily Dish Chicken Stew Grain-Free Wet Dog FoodCaruCaru Daily Dish Chicken Stew Grain-Free Wet Dog FoodWet // No. 13 on the labelKoha Limited Ingredient Bland Diet Lamb & Rice Recipe Wet Dog FoodKohaKoha Limited Ingredient Bland Diet Lamb & Rice Recipe Wet Dog FoodWet // No. 13 on the labelKoha Limited Ingredient Bland Diet Beef & Rice Recipe Wet Dog FoodKohaKoha Limited Ingredient Bland Diet Beef & Rice Recipe Wet Dog FoodWet // No. 13 on the labelGo! Solutions Immune Health Shredded Chicken + Salmon in Bone Broth Grain-Free Dog Food TopperGo! SolutionsGo! Solutions Immune Health Shredded Chicken + Salmon in Bone Broth Grain-Free Dog Food TopperTopper // No. 13 on the labelZignature Original Food Pork Formula Grain-Free Wet Dog FoodZignatureZignature Original Food Pork Formula Grain-Free Wet Dog FoodWet // No. 13 on the labelZignature Original Food Turkey Formula Grain-Free Wet Dog FoodZignatureZignature Original Food Turkey Formula Grain-Free Wet Dog FoodWet // No. 13 on the labelZignature Original Turkey Formula with Probiotics Grain-Free Dry Dog FoodZignatureZignature Original Turkey Formula with Probiotics Grain-Free Dry Dog FoodDry // No. 13 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. 13 on the labelZignature Original Lamb Formula with Probiotics Grain-Free Dry Dog FoodZignatureZignature Original Lamb Formula with Probiotics Grain-Free Dry Dog FoodDry // No. 14 on the labelCaru Classics (Natural Stews) Classics Pork Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Pork Stew Grain-Free Wet Dog FoodWet // No. 14 on the labelGo! Solutions Tranquility Chicken, Salmon + Duck Stew Grain-Free Dog Food TopperGo! SolutionsGo! Solutions Tranquility Chicken, Salmon + Duck Stew Grain-Free Dog Food TopperTopper // No. 14 on the labelGo! Solutions Joint Care Minced Chicken with Gravy Grain-Free Dog Food TopperGo! SolutionsGo! Solutions Joint Care Minced Chicken with Gravy Grain-Free Dog Food TopperTopper // No. 14 on the labelGo! Solutions Immune Health Minced Chicken with Gravy Booster Grain-Free Dog Food TopperGo! SolutionsGo! Solutions Immune Health Minced Chicken with Gravy Booster Grain-Free Dog Food TopperTopper // No. 14 on the labelZignature Original Food Duck Formula Grain-Free Wet Dog FoodZignatureZignature Original Food Duck Formula Grain-Free Wet Dog FoodWet // No. 14 on the labelNutriSource High Plains Select Wet Dog FoodNutriSourceNutriSource High Plains Select Wet Dog FoodWet // No. 14 on the labelNutriSource Turkey & Rice Wet Dog FoodNutriSourceNutriSource Turkey & Rice Wet Dog FoodWet // No. 14 on the labelNutriSource Chicken & Rice Puppy Wet Dog FoodNutriSourceNutriSource Chicken & Rice Puppy Wet Dog FoodWet // No. 14 on the labelNutriSource Senior Chicken & Rice Wet Dog FoodNutriSourceNutriSource Senior Chicken & Rice Wet Dog FoodWet // No. 14 on the labelNutriSource Chicken & Rice Small & Medium Breed Puppy Wet Dog FoodNutriSourceNutriSource Chicken & Rice Small & Medium Breed Puppy Wet Dog FoodWet // No. 14 on the labelNutriSource Beef & Rice Wet Dog FoodNutriSourceNutriSource Beef & Rice Wet Dog FoodWet // No. 14 on the labelZignature Original Small Bites Lamb Formula with Probiotics Grain-Free Dry Dog FoodZignatureZignature Original Small Bites Lamb Formula with Probiotics Grain-Free Dry Dog FoodDry // No. 14 on the labelGo! Solutions Sensitivities Limited Ingredient Grain-Free Venison Recipe Dry Dog FoodGo! SolutionsGo! Solutions Sensitivities Limited Ingredient Grain-Free Venison Recipe Dry Dog FoodDry // No. 14 on the labelEukanuba Puppy Large Breed Dry Dog FoodEukanubaEukanuba Puppy Large Breed Dry Dog FoodDry // No. 14 on the labelNutriSource PureVita Duck Dog Entree Wet Dog FoodNutriSourceNutriSource PureVita Duck Dog Entree Wet Dog FoodWet // No. 15 on the labelZignature Original Food Kangaroo Formula Grain-Free Wet Dog FoodZignatureZignature Original Food Kangaroo Formula Grain-Free Wet Dog FoodWet // No. 15 on the labelNow Fresh Chicken & Salmon Pâté Food for Senior Dogs Grain-Free Wet Dog FoodNow FreshNow Fresh Chicken & Salmon Pâté Food for Senior Dogs Grain-Free Wet Dog FoodWet // No. 15 on the labelNutriSource Chicken, Lamb & Ocean Fish Wet Dog FoodNutriSourceNutriSource Chicken, Lamb & Ocean Fish Wet Dog FoodWet // No. 15 on the labelNutriSource Heartland Select Grain-Free Wet Dog FoodNutriSourceNutriSource Heartland Select Grain-Free Wet Dog FoodWet // No. 15 on the labelNutriSource Woodlands Select Wet Dog FoodNutriSourceNutriSource Woodlands Select Wet Dog FoodWet // No. 15 on the labelAnnamaet Grain Free Lean Formula Dry Dog FoodAnnamaetAnnamaet Grain Free Lean Formula Dry Dog FoodDry // No. 15 on the labelAnnamaet Manitok Formula Grain-Free Dry Dog FoodAnnamaetAnnamaet Manitok Formula Grain-Free Dry Dog FoodDry // No. 15 on the labelAnnamaet Option Medium & Large Breed Salmon Formula Dry Dog FoodAnnamaetAnnamaet Option Medium & Large Breed Salmon Formula Dry Dog FoodDry // No. 15 on the labelAnnamaet Small Breed Salmon Dry Dog FoodAnnamaetAnnamaet Small Breed Salmon Dry Dog FoodDry // No. 15 on the labelGo! Solutions Sensitivities Insect Grain-Free Limited Ingredient Dry Dog FoodGo! SolutionsGo! Solutions Sensitivities Insect Grain-Free Limited Ingredient Dry Dog FoodDry // No. 15 on the labelGo! Solutions Dental + Immune Health Chicken + Salmon Dry Dog FoodGo! SolutionsGo! Solutions Dental + Immune Health Chicken + Salmon Dry Dog FoodDry // No. 15 on the labelGo! Solutions Sensitivities Limited Ingredient Grain-Free Turkey Recipe Dry Dog FoodGo! SolutionsGo! Solutions Sensitivities Limited Ingredient Grain-Free Turkey Recipe Dry Dog FoodDry // No. 15 on the labelAnnamaet Surf & Turf Raw Freeze-Dried Dog FoodAnnamaetAnnamaet Surf & Turf Raw Freeze-Dried Dog FoodFreeze-Dried // No. 16 on the labelDave’s Pet Food Carbolight Carbohydrate & Weight Management for Dogs / Wet Dog FoodDave's Pet FoodDave’s Pet Food Carbolight Carbohydrate & Weight Management for Dogs / Wet Dog FoodWet // No. 16 on the labelCaru Classics (Natural Stews) Classics Beef Stew Grain-Free Wet Dog FoodCaruCaru Classics (Natural Stews) Classics Beef Stew Grain-Free Wet Dog FoodWet // No. 16 on the label

Sources

What we read

Checked October 1, 2026.

  1. 1 Safety of a novel feed ingredient, Algal Oil containing EPA and DHA, in a gestation-lactation-growth feeding study in Beagle dogs PLOS ONE, 2019 // Journal
  2. 2 Correction: Safety of a novel feed ingredient, Algal Oil containing EPA and DHA, in a gestation-lactation-growth feeding study in Beagle dogs PLOS ONE, 2021 // Journal
  3. 3 The Supplementation of Docosahexaenoic Acid-Concentrated Fish Oil Enhances Cognitive Function in Puppies Animals, 2023 // Journal
  4. 4 Therapeutic Effect of EPA/DHA Supplementation in Neoplastic and Non-neoplastic Companion Animal Diseases: A Systematic Review In Vivo, 2021 // Journal
  5. 5 Lipid source and kibble matrix determine oxidative stability and n-3 fatty acid loss in coated extruded dog food Journal of Animal Science, 2026 // Journal
  6. 6 CVM GRAS Notice No Questions Letter U.S. Food and Drug Administration, 2020 // Government
  7. 7 GRAS Notice (GRN) 1156, Algal oil (≥35% docosahexaenoic acid) from Schizochytrium sp. FJRK-SCH3 Runke Bioengineering, filed with U.S. Food and Drug Administration, 2023 // Industry
  8. 8 2025 State of The Industry Report - Algal Oil Centre for Feed Innovation, 2025 // Industry
  9. 9 What's in the Ingredients List? AAFCO, n.d. // 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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