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Iams vs Supreme Source

Iams vs. Supreme Source

In this comparison article for Iams vs Supreme Source, we'll highlight the key differences between these two pet food brands. To properly compare Iams and Supreme Source, 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 Supreme Source vs Iams comparison, we've utilized average data to make general comparisons. If you'd like to see individual product reviews, visit our Iams Review Page or Supreme Source Review Page.

Guaranteed Analysis: Supreme Source vs. Iams

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.

Iams Dog Food vs. Supreme Source Dog Food

Dry Dog Food Iams Supreme Source
Crude Protein 27.8% 28.9%
Crude Fat 15.1% 12.8%
Crude Fiber 5.1% 9.0%

Crude Protein Comparison For Dog Food

Dogs require twenty-two amino acids to sustain life. Twelve of these amino acids are synthesized naturally, the remaining ten are consumed. Protein is the nutrient which provides some or all of these ten essential amino acids.

As you can see, Iams and Supreme Source guarantee a similar amount of crude protein.


Crude Fat Comparison For Dog Food

Like protein, fats are an essential part of a dog's body. Fats are needed for the proper development and function of the canine body.

If you look at the average percentages of crude fat, you'll notice that Iams typically guarantees 2.33% more fat. This is a fairly small difference between Iams and Supreme Source, but still worth mentioning.


According to our data, Supreme Source guarantees 3.91% more fiber than Iams. Although this difference is relatively small, it's still a notable difference.

Iams Cat Food vs. Supreme Source Cat Food

Dry Cat Food Iams Supreme Source
Crude Protein 36.0% 38.9%
Crude Fat 16.8% 16.7%
Crude Fiber 4.3% 5%

Crude Protein Comparison For Cat Food

Cats require twenty-two amino acids to sustain life. Eleven of these amino acids are synthesized naturally, the remaining eleven are consumed. Protein is the nutrient which provides some or all of these eleven essential amino acids.

There is a small difference between the protein content of Supreme Source and Iams. We can see that Supreme Source guarantees about 2.87% more protein than Iams.


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):

  • Help transport nutrients across cell membranes
  • Fats produce metabolites, which help control inflammation
  • Maintain healthy blood pressure
  • Slow the growth of yeast infections
  • Fats improve the taste/texture of food.

Supreme Source and Iams both provide roughly the same amount of crude fat.


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

Iams Pet Food Ingredients vs. Supreme Source Pet Food Ingredients

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

Pea Protein
Tomato Pomace
Poultry Fat (Preserved With Mixed Tocopherols)

Here are some of the controversial ingredients used only by Iams.

Liver
Caramel
Beet Pulp
Corn Meal
Canola Oil
Corn Grits
Iron Oxide
Canola Meal
Fish Digest
Ground Corn
Brewers Rice
Wheat Gluten
Caramel Color
Vegetable Oil
Feeding Oatmeal
Poultry Giblets
Beef By-Products
Corn Gluten Meal
Meat By-Products
Ground Yellow Corn
Powdered Cellulose
Chicken By-Products
Dried Meat By-Products
Chicken By-Product Meal
Ground Whole Grain Corn
Poultry By-Product Meal
Soybean Protein Isolate
Animal Fat (Preserved With Mixed Tocopherols)

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

Iams and Supreme Source both use the following harmful ingredients in many of their products:

Menadione Sodium Bisulfite Complex

Here are some of the harmful ingredients used only by Iams.

Blue 2
Red 40
Corn Oil
Yellow 5
Yellow 6
Ethoxyquin
Added Color
Menadione Dimethylpyrimidinol Bisulfite

Product Safety: Recall History of Iams & Supreme Source?

Iams has been recalled 2 times.

  • Aug. 14, 2013: Salmonella
  • July 30, 2010: Salmonella

According to our records, Supreme Source has never been recalled.

Price Comparison: Which Brand Is More Expensive?

Dry Dog Food Iams Supreme Source
Per Pound $1.34 $1.77
Per Calorie $0.0008 $0.0012
Dry Cat Food Iams Supreme Source
Per Pound $1.74 $2.84
Per Calorie $0.0010 $0.0017

The average cost-per-lb is heavily influenced by the varying amounts of moisture present in each brand's food products (wet vs. dry food, dry vs. freeze-dried food, etc). However, the average cost-per-kcal eliminates the influence of moisture. Therefore, the average cost-per-kcal is the better metric to consider.

If you'd like to calculate the average cost-per-day or cost-pet-year of feeding Iams or Supreme Source, input your pet's weight into our cost analyzer widget.

Averages price data can identify whether or not there exists a significant price difference between two brands. However, the actual price that you'll pay for Iams or Supreme Source will depend on your shopping habits.

Pet owners who use our price comparison feature typically save more than 25% off retail prices for Iams and Supreme Source. In addition, we currently have some great coupons for our readers.


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 Iams Pet Foods

You can purchase Iams pet foods from the following stores:


39 Recipes In-Stock Today

28 Recipes In-Stock Today

28 Recipes In-Stock Today

1 Recipes In-Stock Today

Where To Buy Supreme Source Pet Foods

You can purchase Supreme Source pet food products from these retailers:


10 Recipes In-Stock Today

Type Of Pet Foods Available

Product Iams Supreme Source
Dry Dog Food 29 Recipes 4 Recipes
Wet Dog Food 10 Recipes
Dog Treats 4 Treats
Dry Cat Food 12 Recipes 2 Recipes
Wet Cat Food 31 Recipes
Cat Treats 2 Treats 3 Treats

Compare Pet Food Prices Across Multiple Pet Stores