Ultima vs Nuun looks like a simple electrolyte-drink showdown. But once you compare their formulas, the difference becomes much more obvious.

Nuun Sport brings 300 mg of sodium per serving, while Ultima Replenisher provides just 55 mg. On the other side, Ultima comes loaded with 250 mg potassium and 100 mg magnesium, compared with Nuun’s 150 mg potassium and 25 mg magnesium.

Then there’s sugar.

Ultima delivers 0 calories and 0 grams of sugar, while Nuun Sport powder provides 10 calories, 2 grams of carbohydrate and 1 gram of sugar per serving.

So here’s the simple answer:

Choose Ultima for a mineral-heavy, zero-sugar formula. Choose Nuun when you want a much stronger sodium hit for exercise and sweating.

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Ultima vs Nuun at a Glance

Category	Ultima Replenisher	Nuun Sport Powder	Winner
Sodium	55 mg	300 mg	Nuun
Potassium	250 mg	150 mg	Ultima
Magnesium	100 mg	25 mg	Ultima
Calcium	47 mg	15 mg	Ultima
Chloride	78 mg	40 mg	Ultima
Calories	0	10	Ultima
Sugar	0 g	1 g	Ultima
Carbohydrates	0 g	2 g	Ultima
Main strength	Mineral-heavy, sugar-free formula	Sodium-forward sports formula	Depends

The labels make one thing obvious: Nuun is built around sodium, while Ultima leans much harder into potassium, magnesium and a zero-sugar profile.

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Nuun Absolutely Crushes Ultima on Sodium

Let’s start with the biggest nutritional difference.

Nuun Sport: 300 mg sodium

Ultima: 55 mg sodium

That’s more than five times as much sodium in Nuun.

For anyone who sweats heavily, spends hours exercising or trains in hot conditions, Nuun’s sodium-heavy profile is the obvious standout.

Ultima’s 55 mg is tiny by comparison.

So while Ultima can look impressive because its label lists several minerals, Nuun delivers dramatically more sodium per serving.

Sodium winner: Nuun

And this is easily Nuun’s biggest advantage.

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But Ultima Hits Back With Magnesium

Now turn the bottle around and look at magnesium.

Ultima: 100 mg

Nuun: 25 mg

Ultima gives you four times as much magnesium.

That’s a huge nutritional difference.

For people who specifically want more magnesium in their electrolyte drink, Ultima looks far more impressive. Its mineral profile gives it a strong edge for shoppers who want more than just sodium.

Magnesium winner: Ultima

The more magnesium-heavy formula is one of the biggest reasons Ultima stands apart from a traditional sports-hydration product.

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Ultima Also Beats Nuun on Potassium

Potassium is another clear Ultima win.

Ultima: 250 mg

Nuun: 150 mg

That’s 100 mg more potassium per serving.

Put potassium and magnesium together and Ultima suddenly looks like the heavyweight mineral formula of the two.

Potassium winner: Ultima

If your priority is getting a broader mineral profile from one serving, Ultima has the stronger-looking label.

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Zero Sugar? Ultima Wrecks the Comparison

This one isn’t even close.

Ultima

0 calories

0 grams carbohydrate

0 grams sugar

Nuun Sport

10 calories

2 grams carbohydrate

1 gram sugar

One gram of sugar isn’t a lot. But if your goal is specifically zero sugar and zero calories, Ultima wins instantly.

Sugar-free winner: Ultima

For low-carb and calorie-conscious shoppers, this is one of Ultima’s easiest advantages to understand.

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The Real Ultima vs Nuun Battle

People love asking:

“Which one has more electrolytes?”

That’s the wrong way to look at it.

There isn’t one magic “electrolyte score.”

Instead, look at what each formula emphasizes.

Sodium

Nuun dominates.

Potassium

Ultima wins.

Magnesium

Ultima dominates.

Calcium

Ultima wins.

Chloride

Ultima wins.

Sugar and calories

Ultima wins.

So the better description is:

Nuun is the sodium heavyweight. Ultima is the mineral-heavy, zero-sugar contender.

That’s a much more useful way to understand the two products.

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Ultima’s Biggest Weakness? Sodium

Let’s be blunt.

55 mg sodium is not much compared with 300 mg.

That’s Ultima’s glaring weakness.

You can point to:

250 mg potassium

100 mg magnesium

zero calories

zero sugar

but none of those numbers change the fact that Nuun gives you far more sodium in one serving.

Ultima’s Achilles’ heel: low sodium

So if the entire reason you’re buying an electrolyte product is getting more sodium, Ultima is clearly not the stronger choice.

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Nuun’s Biggest Weakness? It Can’t Match Ultima’s Mineral Numbers

Nuun hits hard with sodium, but Ultima turns the tables with magnesium and potassium.

25 mg magnesium vs 100 mg

150 mg potassium vs 250 mg

Then add:

1 g sugar vs 0 g

10 calories vs 0

and Ultima starts looking much more attractive for anyone who wants a low-calorie mineral drink.

So while Nuun has the sodium hammer, Ultima wins the broader zero-sugar mineral battle.

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Ultima vs Nuun for Everyday Hydration

This is where I’d give Ultima the edge.

If you’re looking for something you can use as a flavored electrolyte drink without adding sugar or calories, Ultima has a very appealing label:

0 calories

0 sugar

250 mg potassium

100 mg magnesium.

That’s a strong combination for an everyday electrolyte mix.

But here’s the catch: you don’t automatically need an electrolyte product just because you’re drinking water.

For many ordinary hydration situations, plain water and a normal diet are enough.

Everyday-use winner: Ultima

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Ultima vs Nuun for Running

For running, the winner depends on what you’re trying to get from the drink.

A short, easy run doesn’t necessarily require an electrolyte formula.

But once the run gets longer and sweat losses climb, sodium becomes much more important.

That’s where Nuun shines.

300 mg sodium vs 55 mg.

That’s a massive numerical advantage.

Running winner: Nuun for sodium-focused use

For someone specifically looking for a higher-sodium electrolyte serving during a long, sweaty run, Nuun is the more compelling formula.

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Ultima vs Nuun for Gym Workouts

A 30-minute strength session in an air-conditioned gym isn’t the same as a two-hour workout in a hot, humid environment.

For light training, either product can be more than you need.

For sweaty training, Nuun’s sodium advantage becomes much more interesting.

For zero-sugar mineral intake, Ultima has a stronger case.

Gym verdict

Choose Nuun when sodium is the priority.

Choose Ultima when potassium, magnesium and zero sugar are the priority.

That’s the simplest way to make the decision.

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Ultima vs Nuun for Long Workouts

Long-duration training is where electrolytes become more useful.

And once again, Nuun’s biggest weapon is its sodium content.

300 mg per serving

versus

55 mg.

That’s a very large difference.

Long sessions can also require more than electrolytes alone. Depending on the activity, you may need to think about:

fluid

sodium

carbohydrate

total energy

and individual sweat losses.

Long-workout winner: Nuun

If you’re specifically comparing the sodium content, Nuun wins easily.

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Ultima vs Nuun for Weight Loss

If you’re trying to cut calories from your drinks, Ultima has the obvious advantage.

Ultima

0 calories

0 sugar

Nuun

10 calories

1 g sugar

Ten calories isn’t much.

But Ultima still has the cleaner calorie profile.

That doesn’t mean Ultima causes weight loss. The advantage here is simply that it contributes zero calories according to its standard label.

Winner: Ultima

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Ultima vs Nuun for Keto

This is another easy category.

Ultima: 0 g carbohydrate, 0 g sugar

Nuun: 2 g carbohydrate, 1 g sugar

For someone deliberately keeping carbohydrate intake extremely low, Ultima fits much more neatly into that goal.

Winner: Ultima

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Which Tastes Better: Ultima or Nuun?

This is where I won’t pretend there is an objective winner.

Taste depends on the person.

Ultima offers multiple flavored formulas.

Nuun Sport also offers different flavors and a distinct electrolyte-drink profile.

Some people want sweeter fruit flavors.

Others prefer a lighter or more tart taste.

Taste winner: Depends

The best electrolyte drink is ultimately the one you actually enjoy enough to drink.

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Ultima vs Nuun Ingredients

The formulas tell the same story as the nutrition panels.

Ultima’s standard formula uses ingredients including:

magnesium citrate

potassium phosphate

potassium aspartate

calcium compounds

sodium chloride

stevia leaf extract

zinc citrate

and manganese citrate.

Nuun Sport powder includes:

dextrose

sodium citrate

citric acid

potassium citrate

magnesium citrate

stevia leaf extract

calcium citrate

and sea salt.

The biggest practical difference is obvious:

Nuun includes dextrose and 1 gram of sugar.

Ultima is sugar-free.

Neither ingredient list automatically makes one product universally superior.

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Ultima vs Nuun: Pros and Cons

Ultima Pros

• 0 calories
• 0 grams sugar
• 250 mg potassium
• 100 mg magnesium
• 47 mg calcium
• 78 mg chloride
• 0 grams carbohydrate
• Broad mineral profile

Ultima Cons

• Only 55 mg sodium
• Not the sodium-focused option
• More potassium and magnesium don’t automatically make it better for every workout

Nuun Pros

• 300 mg sodium
• 150 mg potassium
• 25 mg magnesium
• 40 mg chloride
• Powder format
• Only 1 gram sugar

Nuun Cons

• 10 calories
• 1 gram sugar
• 2 grams carbohydrate
• Much less magnesium than Ultima
• Less potassium than Ultima

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The Verdict: Ultima or Nuun?

Let’s make it simple.

Choose Ultima if you want:

Zero sugar

Zero calories

More potassium

More magnesium

A broader mineral profile

Choose Nuun if you want:

Much more sodium

A sodium-focused electrolyte formula

A small amount of carbohydrate

A stronger fit for prolonged, sweaty exercise

That’s the central decision.

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Final Winner: It Depends on What You Want

Category	Winner
Sodium	🏆 Nuun
Potassium	🏆 Ultima
Magnesium	🏆 Ultima
Calcium	🏆 Ultima
Chloride	🏆 Ultima
Zero sugar	🏆 Ultima
Zero calories	🏆 Ultima
Heavy sweating	🏆 Nuun
Everyday zero-sugar use	🏆 Ultima
Sodium-focused exercise hydration	🏆 Nuun

The clearest conclusion is this:

Ultima is the better pick when you want a zero-sugar, zero-calorie electrolyte powder with more potassium and magnesium.

Nuun is the better pick when you specifically want substantially more sodium per serving.

And that’s a better answer than pretending one product wins every category.

Nuun brings the sodium hammer. Ultima brings the mineral-heavy, zero-sugar formula.

Read the label, decide what matters to you, and pick accordingly.