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Supreme Source vs Kirkland Signature

Supreme Source vs. Kirkland Signature

In this comparison article for Supreme Source vs Kirkland Signature, we'll highlight the key differences between these two pet food brands. To properly compare Supreme Source and Kirkland Signature, we'll use up-to-date nutritional and price information.

There are many factors to consider when choosing the best pet food brand for your pet. Factors such as ingredient quality, guaranteed analysis, product safety, brand history, and cost are among the most important factors to consider.

Throughout this Kirkland Signature vs Supreme Source comparison, we've utilized average data to make general comparisons. If you'd like to see individual product reviews, visit our Supreme Source Review Page or Kirkland Signature Review Page.

Guaranteed Analysis: Kirkland Signature vs. Supreme Source

According to AAFCO, all pet food labels must provide a guaranteed analysis of nutrient content. The analysis must provide guaranteed minimum percentages of crude protein and crude fat, and maximum percentages of crude fiber and moisture.

All percentages used in this comparison are averages reported on a dry matter basis.

Supreme Source Dog Food vs. Kirkland Signature Dog Food

Dry Dog FoodSupreme SourceKirkland Signature
Crude Protein28.9%27.5%
Crude Fat12.8%15.3%
Crude Fiber9.0%5.4%

Crude Protein Comparison For Dog Food

Protein is an extremely important part of your dog's diet. Without sufficient protein, dogs can develop a wide-range of serious health problems.

Kirkland Signature and Supreme Source both provide roughly the same amount of crude protein.


Crude Fat Comparison For Dog Food

Fats are an absolutely vital component of a balanced canine diet. Not only do fats provide energy, but they also serve important roles in the normal development and function of your dog's body. For example, fats help dogs produce prostaglandins, which reduce inflammation among many other significant functions.

According to our data, Kirkland Signature guarantees 2.50% more fat than Supreme Source. Although this difference is relatively small, it's still a notable difference.


There is a small difference between the fiber content of Supreme Source and Kirkland Signature. We can see that Supreme Source guarantees about 3.61% more fiber than Kirkland Signature.

Supreme Source Cat Food vs. Kirkland Signature Cat Food

Dry Cat FoodSupreme SourceKirkland Signature
Crude Protein38.9%34.8%
Crude Fat16.7%15.9%
Crude Fiber5%5.9%

Crude Protein Comparison For Cat Food

Protein is an extremely important part of your cat's diet. Without sufficient protein, cats can develop a wide-range of serious health problems.

Our analysis shows that Supreme Source guarantees 4.07% more protein than Kirkland Signature dry cat food recipes.


Crude Fat Comparison For Cat Food

There are many ways in which dietary fat contributes to the overall health of our feline friends. Here is a short list of benefits provided by fats (not exhaustive):

  • Fats help with the digestion and absorption of fat-soluble vitamins
  • Reduce inflammation associated with arthritis
  • Slow the growth of yeast infections
  • Prevent or reduce the likelihood of certain heart problems.
  • Aid in the development of the retina and visual cortex.

There is a relatively insignificant difference between the crude fat content of the two brands.


Both brands provide roughly the same amount of crude fiber.

Supreme Source Pet Food Ingredients vs. Kirkland Signature Pet Food Ingredients

Supreme Source and Kirkland Signature both use the following controversial ingredients in many of their products:

Pea Protein
Tomato Pomace

Here are some of the controversial ingredients used only by Supreme Source.

Poultry Fat (Preserved With Mixed Tocopherols)

Here are some of the controversial ingredients used only by Kirkland Signature.

Canola Oil
Powdered Cellulose
Organic Canola Meal
Organic Pea Protein
Canola Oil (Preserved With Mixed Tocopherols)
Organic Canola Oil (Preserved With Mixed Tocopherols)

We believe that certain pet food ingredients are linked to adverse health affects; these ingredients are classified as harmful.

Here are some of the harmful ingredients used only by Supreme Source.

Menadione Sodium Bisulfite Complex

Product Safety: Recall History of Supreme Source & Kirkland Signature?

According to our records, neither brand has issued any product recalls. Therefore, consumers have no reason to question the safety of Supreme Source or Kirkland Signature pet food products.


Disclosure: PawDiet has an affiliate relationship with stores featured (or linked-to) in this article. We are compensated for referring customers. Thank you for shopping with our retail partners!

Where To Buy Supreme Source Pet Foods

You can purchase Supreme Source pet foods from the following stores:


8 Recipes In-Stock Today

Where To Buy Kirkland Signature Pet Foods

You can purchase Kirkland Signature pet food products from these retailers:


Type Of Pet Foods Available

ProductSupreme SourceKirkland Signature
Dry Dog Food4 Recipes12 Recipes
Wet Dog FoodNone1 Recipes
Dog Treats2 TreatsNone
Dry Cat Food2 Recipes3 Recipes
Wet Cat FoodNoneNone
Cat TreatsNoneNone

Top Rated Supreme Source Recipes

Dog Food
Supreme Source
Super-Premium Dog Food Turkey Meal and Sweet Potato Recipe
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Dog Food
Supreme Source
Super-Premium Dog Food Pork, Peas and Wild Boar Recipe
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Dog Food
Supreme Source
Super-Premium Dog Food Lamb Meal and Potato Recipe
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Cat Food
Supreme Source
Grain Free Dry Cat Food Whitefish Meal and Salmon Meal Recipe
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Top Rated Kirkland Signature Recipes

Dog Food
Kirkland Signature
(Costco) Super Premium Lamb, Rice & Vegetable Formula For Adult Dogs
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Dog Food
Kirkland Signature
(Costco) Super Premium Chicken, Rice & Vegetable Formula For Puppies
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Dog Food
Kirkland Signature
(Costco) Nature's Domain Turkey & Pea Stew For Dogs
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Cat Food
Kirkland Signature
(Costco) Nature's Domain Salmon Meal & Sweet Potato Recipe Cat Food
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