Ingredient file // Other
Dried Aspergillus Niger Fermentation Product
An enzyme extra with little proof in dogs
This is a dried fungal fermentation product that includes the growth medium. Manufacturers use it to add enzyme activity, but the direct dog trial found no improvement in nutrient digestibility or zinc availability at the tested dose.
- What it is
- Dried material from an Aspergillus niger fermentation, including both the culture solids and liquid.
- Made from
- A fungal culture and nutrient medium
- Main job
- Supplemental enzyme activity
- Typical amount
- Not published
- Watch for
- Supplier strain and toxin testing
- Not the same as
- Fermentation extract
Our read // In our catalog
In 1 of every 137 foods we track
Share of foods that list it
1%
19 of the 2,595 foods with an ingredient list on file, from 4 brands. All dry dog food.
Each square is 1% of the catalog
Where it sits on the label
Median position 72. In the top five of 0 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 100% of foods.
Price per lb
Median of the cheapest bag price across 16 priced foods, 6% above the catalog. The price is the food's, not the ingredient's.
Who leans on it
74%
of the foods that list it are from Health Extension. 4 brands use it in total.
What it is
How it is made
Feed additive makers grow selected Aspergillus niger strains on nutrient media to produce enzymes or other fermentation compounds. They dry the resulting culture and medium together, making a purpose-made ingredient rather than a food-processing leftover.1,5
- 01 // Source Nutrient medium A prepared medium supplies the nutrients on which the selected fungal strain grows.
- 02 // Process Culture grown The strain grows through the medium and produces enzymes or other fermentation compounds.
- 03 // Process Material dried Both the solid and liquid portions of the fermentation are retained and dried.
- 04 // Output Dried product The resulting feed additive contains dried culture material and medium; its enzyme activities depend on the product.
What is in it
Composition, dry matter
32
% protein
A fermented rice bran sample reached about this much crude protein. It is an experimental substrate result, not a specification for the additive on a dog food label.
Why it is in the bag
What the manufacturer gets
-
01
Supplies enzyme activity
The product tested in dogs contained enzymes that act on phytate, protein and plant carbohydrates. The ingredient name alone does not identify the activities in another supplier's product.1,6
-
02
Combines several activities
One tested commercial fermentation product supplied several enzyme activities in a small addition to food. The study measured no cost savings or digestibility gain in dogs.1
-
03
Adds little recipe bulk
The tested product was applied at 200 mg per kg of food. At that dose, it served as an additive rather than a meaningful protein or fiber source.1
-
04
Identifies a fermentation source
The name tells a buyer which fungus made the ingredient. It does not say which enzymes remain active or how much activity reaches the dog's food.1,6
How much A controlled dog trial added 200 mg of one Aspergillus niger fermentation enzyme complex per kg of food; a usual commercial amount is unpublished.1
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
It improves the dog's gut bacteria
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A microbiome analysis of the same 12 Beagles found more fecal Lactobacillus with enzyme addition. It did not show better gut health, and zinc source was also varied. A bacterial shift alone is not a health benefit.1,2
-
Brands say
Its enzymes help dogs digest more food
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
In a trial with 12 Beagles, the fermentation enzyme complex left nutrient and energy digestibility unchanged. A positive trial in 10 dogs tested a separate protease made using both Aspergillus niger and Bacillus subtilis, not this ingredient.1,4
-
Brands say
Its phytase frees more minerals for dogs
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
The tested complex contained phytase, but at 200 mg per kg of high-phytate food it did not improve zinc availability. Enzyme activity on paper does not demonstrate a mineral benefit in a finished dog food.1
-
Owners say
It is a probiotic for dogs
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A probiotic supplies live microorganizms. Canada's feed listing places this dried fermentation product among nonviable ingredients and identifies it as no source of living microbial cells. The fungal name is not evidence of probiotic activity.6
-
Brands say
Healthy dogs need added digestive enzymes
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A separate trial gave 14 healthy Beagles plant or animal enzyme supplements at the manufacturers' recommended doses. Neither improved nutrient or energy digestibility. That result does not support routine enzyme claims for healthy dogs.3
Straight answers
What owners ask
-
Q01
Is it just filler?
NoIt is used as a small fermentation additive, not to bulk up kibble. One dog trial used 200 mg per kg of food. Its intended enzyme job is clear, even though that trial found no digestibility gain.1,6
-
Q02
Is it a probiotic?
NoThis dried fermentation product is not a live culture. Canada's feed listing explicitly treats it as nonviable. If a bag promises probiotics, look for a separately named live microorganizm and its stated amount.6
-
Q03
Does it replace prescription enzymes?
NoDogs with pancreatic enzyme deficiency need enzyme replacement for that condition. This label name states neither the needed activities nor a treatment dose. A trial of routine enzyme supplements in healthy dogs found no digestibility benefit.3,6
Who uses it
Brands, best sellers and the company it keeps
Top brands, by foods that list it
Usually listed with, share of the foods that list it
- Dried Beet Pulp 74%
- Brewers Dried Yeast 53%
- Chicken 47%
- Chicken Meal 47%
- Chicken Fat 47%
- Brown Rice 42%
- Menhaden Fish Meal 42%
- Flaxseed 42%
- Sweet Potatoes 42%
- Oatmeal 37%
- Pearled Barley 37%
- Chickpeas 37%
Our read // On the bag
Read it as an unproven enzyme extra
If this appears near the end of a bag's ingredient list, treat it as a small additive. Check the main ingredients and nutritional adequacy first. The name does not reveal active enzyme levels, and the direct dog trial found no digestibility benefit. Do not pay more for this line alone.
Sources
What we read
Checked October 1, 2026.
- 1 Effect of Zinc Source and Exogenous Enzymes Supplementation on Zinc Status in Dogs Fed High Phytate Diets
- 2 Effects of Zinc Source and Enzyme Addition on the Fecal Microbiota of Dogs
- 3 Effect of enzyme supplements on macronutrient digestibility by healthy adult dogs
- 4 Addition of Protease Enzyme to Dog and Cat Feed and Its Influence on the Digestibility Coefficient, Immune Response, and Metabolic Biomarkers
- 5 Nutrient Content of Cassava Dregs and Rice Bran Fermented with Aspergillus niger
- 6 Canadian Feed Ingredients Table (CFIT)
- 7 Safety evaluation of the food enzyme chymosin from the genetically modified Aspergillus niger strain DSM 29544