Red Bull Sugar Free: Calories, Nutrition and Health Benefits

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Red Bull Sugar Free has 10 calories, 2 g carbs, 0 g sugar and 105 mg sodium in an 8.4 fl oz (250 ml) can, plus 80 mg of caffeine. Sucralose and acesulfame K replace the sugar, so it adds almost no energy and barely moves blood glucose. The numbers here are for the can, not the regular Red Bull, which has about 110 calories and 27 g sugar.

Quick Nutrition Facts

Per 1 can (8.4 fl oz / 250 ml)

Nutrient	Amount
Calories	10 kcal
Protein	0g
Carbohydrates	2g
Fiber	0g
Sugars	0g
Fat	0g
Sodium	105 mg

Macronutrient Breakdown

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NUTRITIONIST'S INSIGHT

For calories and blood sugar, this is one of the easiest energy drinks to fit in: 10 kcal and 0 g sugar per can. The real limits are caffeine and sodium. One can gives 80 mg of caffeine, a fifth of the 400 mg a day the FDA cites for most healthy adults, so a second can plus two coffees gets close to the ceiling. The 105 mg of sodium is 5% of the daily value, small unless you drink several. The sweeteners are the open question. WHO's 2023 guideline recommends against using non-sugar sweeteners to control weight, since reviews found no long-term fat loss benefit, though it rates that recommendation as conditional. Treat the can as a swap for a sugared drink, not as a weight-loss tool.

Myth Busters

MYTH #1: Sugar free means it has no calories

TRUTH: The can lists 10 calories and 2 g of carbohydrate per 8.4 fl oz. That is small, but not zero. Three cans a day adds about 30 kcal, which is still trivial next to a regular Red Bull at about 110 kcal per can. Red Bull Sugarfree: Ingredients and Nutrition Facts (Red Bull US); Red Bull Sugar Free Energy Drink 8.4 fl oz label (Instacart retailer listing)

MYTH #2: Sugar free Red Bull has less caffeine than the original

TRUTH: Both versions carry 80 mg of caffeine per 8.4 fl oz can. Taking out the sugar changes the sweetener, not the stimulant dose. Red Bull Sugarfree: Ingredients and Nutrition Facts (Red Bull US); How much caffeine is in a can of Red Bull Sugarfree? (Red Bull US)

MYTH #3: Switching to a sweetener drink guarantees weight loss

TRUTH: WHO found no long-term body fat benefit from non-sugar sweeteners in its 2023 review and recommends against using them for weight control. Swapping a sugared drink for this one cuts about 100 kcal a can, but it only helps if the rest of your eating stays the same. WHO advises not to use non-sugar sweeteners for weight control (WHO, 2023)

MYTH #4: The 80 mg of caffeine is too much to drink every day

TRUTH: The FDA cites 400 mg a day as an amount not generally linked to negative effects for most healthy adults, so one or two cans fit under it. People who are sensitive to caffeine, have heart rhythm problems or are pregnant should ask a clinician first. How much caffeine is in a can of Red Bull Sugarfree? (Red Bull US); Spilling the Beans: How Much Caffeine is Too Much? (FDA)

MYTH #5: Pregnant women can drink it because it has no sugar

TRUTH: Sugar is not the issue. ACOG treats less than 200 mg of caffeine a day as moderate during pregnancy, so one 80 mg can fits but a second can plus coffee may not. The FDA tells anyone pregnant or trying to conceive to talk to their provider about limits. Spilling the Beans: How Much Caffeine is Too Much? (FDA); Moderate Caffeine Consumption During Pregnancy (ACOG)

NutriScore by Health Goals

Health Goal	NutriScore	Why This Score?
Weight Loss		At 10 kcal a can it is a low-calorie swap for sugared drinks, but WHO found no long-term fat loss benefit from sweeteners themselves, and it does not fill you up. Red Bull Sugarfree: Ingredients and Nutrition Facts (Red Bull US); WHO advises not to use non-sugar sweeteners for weight control (WHO, 2023)
Muscle Gain		No protein and 2 g of carbs, so it does nothing for recovery. The 80 mg of caffeine may help a workout feel easier, but it is not a nutrition source. Red Bull Sugarfree: Ingredients and Nutrition Facts (Red Bull US); How much caffeine is in a can of Red Bull Sugarfree? (Red Bull US)
Diabetes Management		0 g sugar and 2 g carbs per can, so it should not raise glucose in a meaningful way. Count it as a free drink, and keep total caffeine in check. Red Bull Sugarfree: Ingredients and Nutrition Facts (Red Bull US)
Heart Health		Low calories and no sugar are positives, but 105 mg of sodium and 80 mg of caffeine a can add up if you drink several, and caffeine can lift heart rate in sensitive people. Red Bull Sugarfree: Ingredients and Nutrition Facts (Red Bull US); Spilling the Beans: How Much Caffeine is Too Much? (FDA)
Pregnancy		One can is 80 mg of caffeine against the 200 mg a day ACOG calls moderate. It fits only if it is the only caffeine you have that day. How much caffeine is in a can of Red Bull Sugarfree? (Red Bull US); Moderate Caffeine Consumption During Pregnancy (ACOG)

PERSONALIZED NUTRITION

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Blood Sugar Response to Red Bull Sugar Free

A can of Red Bull Sugar Free has 0 g sugar and 2 g carbs, so blood glucose should stay close to your fasting baseline, with at most a 1 to 2 mg/dL drift. The curve shown is an illustrative estimate from the carb count, not a measured response. Caffeine can raise glucose slightly in some people with diabetes, so a meter reading after your first can is the best check. Red Bull Sugarfree: Ingredients and Nutrition Facts (Red Bull US)

Typical Glucose Response Curve

Not medical advice

How to flatten the spike

Drink it with a meal or a protein snack if caffeine upsets your stomach or makes you jittery on an empty stomach.
Keep total caffeine under about 400 mg a day by counting coffee, tea and other energy drinks together.
If you have diabetes, test your glucose an hour after your first can to see how your body responds to caffeine.
Skip it in the 6 hours before bed; 80 mg of caffeine can cut into sleep.

Cultural Significance

Red Bull launched in Austria in 1987, based on a Thai tonic called Krating Daeng, and built its sugar-free version for people who wanted the same taste without sugar. In the US the Sugarfree can sits next to the original and Red Bull Zero, which use different sweeteners and taste different. Red Bull says both share the same caffeine, taurine and B-vitamin mix. The brand's long tie to extreme sports, Formula 1 and gaming made the 8.4 fl oz can a fixture at gyms, study sessions and long drives.

Compare & Substitute

Red Bull Sugar Free vs Similar Foods

Nutrient	Red Bull Energy Drink (original, 8.4 fl oz)	Coke Zero (12 fl oz)	Black coffee (8 fl oz)	Unsweetened sparkling water (12 fl oz)
Calories	110 kcal	0 kcal	2 kcal	0 kcal
Protein	1g	0g	0.3g	0g
Carbohydrates	28g	0g	0g	0g
Fat	0g	0g	0g	0g

Frequently Asked Questions

How many calories are in Red Bull Sugar Free?

One 8.4 fl oz (250 ml) can has 10 calories, 0 g fat, 2 g carbohydrate, 0 g sugar, 0 g protein and 105 mg sodium.

How much caffeine is in a can of Red Bull Sugar Free?

An 8.4 fl oz can has 80 mg, about the same as a home-brewed cup of coffee. A 12 fl oz can has 114 mg, a 16 fl oz can has 151 mg and a 20 fl oz can has 198 mg.

What sweeteners are in Red Bull Sugar Free?

Red Bull names sucralose and acesulfame potassium (acesulfame K). Some retailer listings show an older ingredient list that includes aspartame, so read the can you are buying.

Is Red Bull Sugar Free the same as Red Bull Zero?

No. Red Bull says Zero and Sugarfree share the same caffeine, taurine and B-vitamins, but they taste different and use different sweeteners. Both have no sugar.

Can people with diabetes drink Red Bull Sugar Free?

With 0 g sugar and 2 g carbs per can, it should not spike blood sugar the way a regular energy drink does. Caffeine can affect glucose in some people, so check your meter after the first can and ask your clinician about daily limits.

How many cans a day are safe?

The FDA cites 400 mg of caffeine a day as an amount not generally linked to negative effects for most healthy adults. Five cans would reach 400 mg from this drink alone, and most people also have coffee or tea, so one or two cans is a safer ceiling. Pregnant people are advised to stay under 200 mg a day by ACOG.