Pepsi vs Coke Ingredients: What’s Actually Different (2026)

Last reviewed: November 2026. Reflects the U.S. Coca-Cola and Pepsi labels, 12 fl oz cans, both photographed October 2026. Zero-sugar versions compared below.

Pepsi and Coke are closer than either company would like you to think. Put the two cans side by side and six of Pepsi’s eight ingredients are Coke’s six ingredients: carbonated water, high fructose corn syrup, caramel color, phosphoric acid, caffeine, and natural flavor. Pepsi adds two things, a second sugar and citric acid, and those two lines explain most of what people taste in a blind test: Pepsi is a little sweeter and has a citrus snap up front, and Coke reads as more vanilla and spice. In numbers, Pepsi has 2 more grams of sugar, 10 more calories, and 4 more milligrams of caffeine per can, and 15 mg less sodium. None of those differences changes the health picture. Here’s the line-by-line comparison, why the cans taste different, and how the zero-sugar versions line up.

Quick answer: what’s the difference between Pepsi and Coke ingredients?

The two ingredient lists

Three things to notice. The order is nearly identical down to the fourth line, which means the proportions are too: these are two versions of the same drink. Pepsi’s extra sugar comes after the caramel color, so it’s a small top-up on top of the corn syrup, and that’s where the 2 extra grams come from. And citric acid shows up only in Pepsi, alongside the phosphoric acid both share; it’s the reason Pepsi’s first sip tastes brighter.

Pepsi vs Coke, ingredient by ingredient

Carbonated water Same

Both. About 90% of either can.

High fructose corn syrup Flagged, both

The main sweetener in both U.S. cans, and second on both lists. Coke’s 39 g and Pepsi’s 41 g are each about 10 teaspoons, more than a day’s worth of added sugar for a child and most of an adult’s. The health effects come from the dose, not the brand or the sugar type. Our high fructose corn syrup breakdown has the research. Both companies also sell real-sugar versions, which taste slightly different and are nutritionally the same.

Sugar Pepsi only

Pepsi’s second sweetener, listed after the color. It’s a small amount, but it’s why Pepsi edges Coke on sugar, 41 g to 39 g, and part of why it reads sweeter.

Caramel color Same, both

The brown in both, a Class IV caramel made with ammonia and sulfites. It can contain 4-MEI, a byproduct California lists as a possible carcinogen. Both companies changed their caramel color manufacturing around 2012 to bring 4-MEI below the level that would require a California warning label. Our caramel color breakdown covers the four classes and the 4-MEI story.

Phosphoric acid Flagged, both

The cola acid in both cans, and the reason colas are among the most acidic drinks you can buy. It’s hard on tooth enamel, and heavy cola intake has been linked to lower bone density in women in at least one large study. Same ingredient, similar amount, in either can. Our phosphoric acid breakdown has the detail.

Citric acid Pepsi only

The ingredient that makes the biggest taste difference. Citric acid is a sharper, fruitier acid than phosphoric, and Pepsi uses both. It’s the “zing” in Pepsi’s first sip. Harmless in itself; it adds a little to the acidity.

Caffeine Both, modest

34 mg in a can of Coke, 38 mg in a can of Pepsi. Both are about a third of an 8 oz cup of brewed coffee. The 4 mg difference won’t register for anyone.

Natural flavors Undisclosed, both

The secret formulas. Coke’s flavor profile leans toward vanilla, cinnamon, and citrus oils; Pepsi’s leans more toward citrus. Neither company discloses the blend, and “natural flavors” on a label tells you only that the compounds came from plant or animal sources.

Why Pepsi and Coke taste different

The label explains most of it. Pepsi has slightly more sugar and an extra acid, so the first sip is sweeter and sharper, which is exactly what wins single-sip blind tests like the old Pepsi Challenge. Coke has a little less sugar, no citric acid, and a flavor blend that leans on vanilla and spice, so it tastes rounder and holds up better over a whole can. Pepsi also has less sodium (30 mg vs 45 mg), which slightly changes how the sweetness lands. The rest is the undisclosed flavor blend and carbonation level, which no label will tell you.

Pepsi vs Coke nutrition, side by side

Regular colas from the cans we photographed in October 2026; zero-sugar figures from the current U.S. labels covered in each post.

Pepsi Zero Sugar vs Coke Zero, and the diet versions

The zero-sugar colas follow the same pattern as the originals: nearly the same build, small differences. Coke Zero Sugar uses aspartame and acesulfame potassium with a trace of stevia, and 34 mg of caffeine. Pepsi Zero Sugar uses aspartame and acesulfame potassium, and since its 2023 reformulation has 38 mg of caffeine, not the 69 mg older articles still quote. Both carry the phenylketonurics warning for aspartame. Diet Coke is the outlier, with aspartame alone and the most caffeine of the group at 46 mg. Diet Pepsi uses aspartame and Ace-K with 35 mg. If you want the zero-sugar cola that tastes most like its sugared parent, that’s what Coke Zero and Pepsi Zero are designed to do; Diet Coke is its own flavor. Our aspartame and Ace-K explainers cover the sweeteners.

Is Pepsi or Coke healthier?

The concerns, ranked by evidence (they’re the same for both):

1. Sugar. 39–41 g per can. Daily sugared soda is the habit most consistently linked to weight gain, type 2 diabetes, and fatty liver.
2. Teeth. Phosphoric acid plus sugar; colas are among the most erosive drinks tested.
3. Bone health at heavy intake. The cola-bone density association is in women drinking cola daily; one can now and then isn’t the concern.
4. Caramel color (4-MEI). Levels reduced since 2012; a low-priority concern at current amounts.
5. Caffeine. 34–38 mg; modest for adults, worth noting for kids.

Pepsi and Coke for kids, pregnancy, and diabetes

Kids: either can is more added sugar than the American Heart Association’s 25 g daily limit for children, plus 34–38 mg of caffeine. Neither is a good everyday drink for a child; a caffeine-free soda doesn’t fix the sugar.

Pregnancy: caffeine guidance in pregnancy is under 200 mg a day, and a can of either is under 40 mg. The sugar is the bigger consideration, especially with gestational diabetes.

Diabetes: the 39–41 g of fast sugar hits blood glucose the same way in either can. The zero-sugar versions don’t.

Cleaner alternatives

For the cola taste without the sugar: Coke Zero Sugar or Pepsi Zero Sugar, whichever you prefer. For a cola without artificial sweeteners or corn syrup: Olipop or Poppi colas, with a few grams of sugar and real fiber. For no caffeine: Sprite and other caffeine-free sodas, though the sugar is the same. And for the drink that beats both on every line: sparkling water.

This article is for informational purposes and is not medical advice. Talk to a doctor or registered dietitian about your individual nutrition needs.