Alternative Protein Sources in Pet Food: The Potential of Fermentation-Derived Protein
Protein is one of the most important components of pet food. As manufacturers explore new ingredients, fermentation-derived proteins offer another way to broaden the options available for dog and cat nutrition.
Protein is central to pet food formulation, but choosing the right protein source involves more than meeting a target on a nutritional specification sheet. Manufacturers must consider amino acid composition, digestibility, palatability, processing performance, consistency of supply and cost.
Animal-derived ingredients remain important in the industry. However, plant proteins, insect meals and microbial proteins are creating additional possibilities for manufacturers looking to diversify their formulations and explore new approaches to protein production.
One of these approaches is biomass fermentation, which uses microorganisms to produce protein-rich ingredients. Kluvy®, a mycoprotein derived from Kluyveromyces marxianus, is being developed around this concept.
What does this mean for pet food manufacturers, and where could fermentation-derived protein fit into future formulations?
Understanding Protein in Pet Food
Protein provides amino acids that dogs and cats need to build and maintain muscles, skin, hair and other tissues. It also supports the production of enzymes and other compounds involved in normal body functions.
Not all protein sources offer the same nutritional value. Their suitability depends on their amino acid profile, digestibility and contribution to the overall nutritional balance of the finished food. Cats and dogs also have different nutritional requirements. Cats, for example, have specific requirements for taurine and other essential nutrients that must be considered when formulating their diets. For this reason, a high crude protein percentage does not automatically make an ingredient suitable for every application. The quality of the protein and its role in the complete formulation matter just as much.
The intended product is another important consideration. Dry kibble, wet food, treats and specialized diets have different formulation and processing requirements. An ingredient that performs well in one application may require further development before it can be used successfully in another.
For pet food manufacturers, the challenge is to find ingredients that deliver the required nutritional contribution while meeting practical production and commercial needs.
Exploring Alternative Protein Sources
Alternative proteins are not a single category of ingredients. They include several approaches to protein production, each with its own advantages, limitations and development requirements.
Plant-based proteins
Soy, pea and wheat proteins are established ingredients in many food and animal nutrition applications. They can provide substantial amounts of protein and offer useful functional properties. Their suitability depends on the specific ingredient, its amino acid profile, digestibility and interaction with the other components of a formulation. Additional ingredients may be needed to achieve the desired nutritional balance.
Insect proteins
Proteins derived from insects, including black soldier fly larvae and mealworms, have attracted growing interest in animal nutrition. Their composition depends on the insect species, rearing conditions and processing method. Manufacturers must also consider ingredient consistency, palatability, supply availability and the regulatory requirements for the intended use.
Algae and aquatic sources
Certain microalgae and other aquatic organisms can contribute protein and, depending on the species, additional nutrients or functional components. These ingredients offer different possibilities for formulation, although their commercial suitability depends on factors such as nutritional composition, production costs, processing requirements and supply.
Microbial proteins and fermentation
Microbial proteins offer a different approach. Instead of obtaining protein directly from crops or livestock, manufacturers cultivate selected microorganisms under controlled conditions and recover the resulting biomass. Yeasts, fungi and bacteria can all be used in microbial protein production. The resulting ingredients differ in their composition and properties, depending on the microorganism, fermentation process and downstream processing. This is an important distinction: microbial protein is not one uniform ingredient. Each source needs to be evaluated on its own merits.
For pet food developers, fermentation offers another route to ingredient production and an opportunity to investigate protein sources beyond conventional animal and plant ingredients.
What Makes an Alternative Protein Suitable for Pet Food?
A promising protein source must do more than look attractive on paper. Its value depends on how it performs in the intended formulation and, ultimately, in the finished product.
Several factors deserve particular attention.
Nutritional profile. Protein content, essential amino acids and the contribution of the ingredient to the complete diet all need to be assessed.
Digestibility. The animal must be able to digest the protein and make its amino acids available for use. Results from other species or other ingredients should not automatically be assumed to apply.
Palatability. Aroma, taste and texture influence whether dogs and cats accept a product. Palatability needs to be evaluated in the relevant formulation.
Processing performance. Dry kibble production typically involves extrusion and drying, while wet food manufacturing has different processing conditions. Ingredient stability, texture, water interactions and compatibility with existing processes can all affect the outcome.
Consistency and supply. Commercial manufacturers need reliable specifications, reproducible quality and a supply chain capable of meeting production requirements.
Safety and regulatory compliance. A new ingredient must satisfy the applicable requirements for its intended use and target species.
These considerations are not unique to alternative proteins. They are part of the normal evaluation of any ingredient entering a new application. They become particularly important, however, when moving an ingredient from one food category into another.
Introducing Kluvy®: Protein Produced Through Fermentation
Kluvy® is a high-quality, fermentation-derived protein produced from Kluyveromyces marxianus, a yeast species. Through controlled biomass fermentation, Kluvy offers an alternative approach to protein production, combining a strong nutritional profile with the potential for resource-efficient manufacturing.
Kluvy brings together several nutritional and functional characteristics that make it an interesting ingredient for food innovation.
Complete Protein Source: Provides all nine essential amino acids required in the human diet.
High Protein Quality (PDCAAS = 1): Achieves a Protein Digestibility-Corrected Amino Acid Score of 1, the maximum score under this human-nutrition assessment method.
Allergen-Free: Developed without common allergens such as soy, dairy and gluten, subject to ingredient specifications and appropriate manufacturing controls.
Prebiotic Potential (β-Glucan): Contains beta-glucan, a dietary fibre with potential prebiotic properties.
Complete Amino Acid Profile: Provides a broad amino acid profile, including essential amino acids.
Rich in BCAAs: Contains branched-chain amino acids (leucine, isoleucine and valine), which contribute to protein nutrition.
Mineral Enrichment Potential: Offers the potential for mineral enrichment, depending on the formulation and processing requirements.
Kluvy has also reached an important regulatory milestone in the United States. In September 2025, the U.S. Food and Drug Administration (FDA) completed its review of GRAS Notice No. 1248 for Kluvy® Protein and stated that it had no questions regarding the conclusion that the ingredient is Generally Recognized as Safe (GRAS) under its specified conditions of use in human food. This provides an important foundation for Kluvy's human-food applications.
For pet food manufacturers, these characteristics offer a starting point for exploring Kluvy as an alternative protein ingredient. Its potential use in dog and cat food requires further assessment of species-specific nutritional requirements, amino acid digestibility, palatability, processing performance and the applicable regulatory requirements for the intended market.
The objective is straightforward: to understand how Kluvy can contribute to a balanced formulation while meeting the nutritional, technical and commercial needs of pet food manufacturers.
Where Could Kluvy® Fit in Pet Food?
The potential of a new protein ingredient is best understood in the context of real formulation needs. Kluvy could be investigated for applications in both dry and wet dog and cat food, as well as other pet food products where a fermentation-derived protein ingredient may be appropriate. These are potential development areas rather than established commercial uses.
Dry pet food
Dry kibble manufacturers need ingredients that work within the extrusion process and contribute to the desired nutritional composition and product structure. Evaluating Kluvy in this category would involve examining its effect on the formulation, processing behaviour, final texture, nutritional profile and acceptance by the target animal.
Wet pet food
Wet formulations present a different set of challenges, including moisture management, texture, stability and the interaction between ingredients during processing. Kluvy could be assessed as part of a wet food formulation to determine whether its nutritional and functional properties meet the requirements of the finished product.
Dog and cat food formulations
The nutritional requirements of dogs and cats are not interchangeable. A formulation intended for cats must account for their specific essential nutrient requirements, while a dog food formulation must meet the corresponding requirements for its target life stage and intended use. Kluvy's suitability would therefore need to be assessed separately for each target species and application. This includes determining its contribution to essential amino acid requirements and the overall nutritional adequacy of the finished diet.
Across these applications, the key question is straightforward: can Kluvy contribute useful nutritional or functional properties while meeting the technical and commercial requirements of the manufacturer? That is what formulation trials and ingredient-specific data need to establish.
From Ingredient Potential to Practical Application
The development of alternative proteins is not necessarily about replacing every conventional ingredient. It is also about giving formulators more options. Different ingredients can serve different purposes. The right choice depends on the nutritional targets, manufacturing process, product positioning, cost structure and intended market.
Fermentation-derived protein adds another approach to this process. It offers a way to produce protein-rich biomass through controlled cultivation of microorganisms and creates opportunities to explore new ingredients for animal nutrition.
For Kluvy, the next step is application-specific evaluation. Manufacturers need to understand the ingredient's nutritional composition, digestibility, palatability, processing behaviour, safety and regulatory suitability for the intended product.
With the right supporting data and formulation work, Kluvy could become part of the broader conversation about alternative protein sources for pet food.
Exploring Kluvy® for Pet Food Development
Looking for additional protein ingredients to evaluate for your next pet food formulation?
Kluvy® offers a fermentation-derived approach worth exploring. Contact the Kluvy team
to discuss the ingredient's technical specifications and its potential fit for dry or wet dog and cat food development.
Comments