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What are the ingredients in diet root beer soda?

Quick answer

Diet root beer is typically carbonated water, caramel color, a preservative, aspartame (often with acesulfame potassium), natural and artificial flavors, and an acid such as citric or malic acid. The USDA FoodData Central records for store and national brands list 0 calories and 0 g sugar. Ingredients vary by brand, so check the label.

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In this article
  1. What is in diet root beer?
  2. Does diet root beer have sugar?
  3. Does root beer have citric acid or phosphoric acid?
  4. Does regular root beer have sugar?
  5. Is aspartame safe?

What is in diet root beer?

We looked at USDA FoodData Central branded-food records for six products named “diet root beer” (Schnuck Markets, Hank’s Beverage Company, Walmart, Ahold, Dr Pepper/Seven Up). Every one lists carbonated water first, then caramel color, a preservative (sodium or potassium benzoate), natural and artificial flavor, and aspartame. Most also list acesulfame potassium, and an acid: citric acid or malic acid. One lists yucca extract and gum acacia; one lists quillaia extract.

Does diet root beer have sugar?

No sugar is listed. All six records show 0 kcal, 0 g total sugars, 0 g fat and 0 g protein.

Does root beer have citric acid or phosphoric acid?

It depends on the brand. Among the regular root beer records we opened, some list citric acid (for example Associated Wholesale Grocers and LA Bottleworks), and one (City Brewing Company) lists phosphoric acid along with citric acid. The diet records we opened list citric or malic acid, not phosphoric acid.

Does regular root beer have sugar?

Yes, in the records we opened. Regular root beer soda lists high fructose corn syrup or cane sugar, and the USDA entries show about 33 to 53 kcal (the figure shown in the search record, per 100 g).

Is aspartame safe?

The FDA says its scientists “do not have safety concerns when aspartame is used under the approved conditions” and gives an acceptable daily intake of 50 mg per kg of body weight per day. People with phenylketonuria (PKU) should avoid or restrict it, and products with aspartame must carry a phenylalanine statement. If you have a health condition or are pregnant, ask a doctor or pharmacist.

These are examples, not every brand. Recipes change, so read the ingredient list on your can or bottle.

People also ask

Does diet root beer have aspartame?

In the six USDA FoodData Central records we opened, yes: all list aspartame, most with acesulfame potassium. Other brands may use different sweeteners, so check the label.

Does root beer have phosphoric acid?

Some do. One regular root beer record (City Brewing Company) lists phosphoric acid; the diet records we opened list citric or malic acid instead.

Does root beer have sugar?

Regular root beer lists high fructose corn syrup or cane sugar in the USDA records we opened. Diet root beer lists 0 g sugars.

General information only, not medical advice. If you have a health condition or are pregnant, ask your doctor before changing what you drink.

Sources

  1. USDA FoodData Central: DIET ROOT BEER (Schnuck Markets), read 5 Nov 2026
  2. USDA FoodData Central: ROOT BEER SODA (City Brewing Company), read 5 Nov 2026
  3. FDA: Aspartame and Other Sweeteners in Food, read 5 Nov 2026
Written by Drinks Type Editorial Team · Published Nov 22, 2024 · Updated Nov 5, 2026
About · How we verify this · Editorial policy · Corrections

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