How much caffeine is in a sugar free 12 oz Red Bull?

Quick Answer

A 12 oz sugar free Red Bull contains 114 mg of caffeine. This is slightly less than a regular 12 oz Red Bull, which contains 114-120 mg of caffeine.

Caffeine Content in Red Bull

Red Bull is an energy drink known for its high caffeine content. Here are the caffeine amounts in different sizes of Red Bull:

Red Bull Size Caffeine (mg)
8.4 oz 80
12 oz 114-120
16 oz 160
24 oz 240

As you can see, a 12 oz Red Bull contains 114-120 mg of caffeine. This applies to both the regular and sugar free versions.

The sugar free version contains sucralose and acesulfame K rather than sugar to sweeten the drink. It does not contain any calories or carbs from sugar.

Caffeine Content in Sugar Free Red Bull

Specifically, a 12 oz sugar free Red Bull contains 114 mg of caffeine.

This is slightly less than the 114-120 mg in a regular 12 oz Red Bull, but it’s still a very high amount of caffeine.

For reference, here are some other drinks and their caffeine content in milligrams:

– Brewed coffee (12 oz): 120-180 mg
– Black tea (12 oz): 40-120 mg
– Green tea (12 oz): 30-50 mg
– Coca-cola (12 oz): 34 mg
– Pepsi (12 oz): 38 mg

So you can see that the 114 mg of caffeine in a sugar free Red Bull is on par with the amount in brewed coffee and significantly higher than that in soda.

How Does Sugar Free Red Bull Compare to Other Energy Drinks?

Sugar free Red Bull contains a similar amount of caffeine as other popular sugar free energy drinks.

Here’s how it compares:

Energy Drink (12 oz) Caffeine (mg)
Sugar free Red Bull 114
Sugar free Monster 120
Sugar free Rockstar 120
Sugar free NOS 130

As you can see, they all contain about 120 mg caffeine per 12 oz serving.

So sugar free Red Bull contains just as much caffeine as its major competitors in the energy drink market. It provides the same energy boost without the sugar.

Caffeine’s Effects on the Body

Caffeine is a stimulant that affects both your brain and body. Here are some of the effects 114 mg of caffeine from a sugar free Red Bull may cause:

– Increased alertness and energy
– Elevated mood
– Faster reaction times
– Improved focus and concentration
– Boosted metabolism
– Enhanced physical performance

Caffeine works by blocking adenosine, a compound in the brain that makes you feel tired. It also stimulates the release of adrenaline, the “fight or flight” hormone.

However, everyone responds differently to caffeine based on factors like genetics and tolerance. People who regularly consume caffeine may experience less of an effect.

Too much caffeine can also lead to negative side effects in some individuals, including:

– Jitters, nervousness and anxiety
– Insomnia
– Headaches
– Irregular heartbeat
– Upset stomach
– Dehydration

That’s why health experts recommend limiting caffeine intake to 400 mg per day or less. Drinking more than one sugar free Red Bull per day could easily exceed this amount for most people.

Is Sugar Free Red Bull Keto-Friendly?

The keto diet involves eating very low carb, high fat and moderate protein. On keto, you want to limit net carbs to 20-50 grams per day.

Sugar free Red Bull contains 0 grams of carbs and sugar, making it keto-friendly.

However, some health experts warn against relying too heavily on artificial sweeteners like sucralose and acesulfame K while on keto. They recommend getting carbs from natural sources like low carb vegetables instead.

An occasional sugar free Red Bull on keto is fine for a caffeine boost. But it shouldn’t be a daily habit due to potential health concerns around artificial sweeteners.

Safety and Side Effects of Sugar Free Red Bull

While sugar free Red Bull eliminates calories from sugar, some people worry about the safety of its artificial sweeteners and other ingredients. Here are some considerations:


– Passes through the body undigested
– Considered very safe by regulatory agencies in the doses found in food and drinks
– Some concerns around harmful effects on gut bacteria with excessive intake

Acesulfame potassium (Ace-K)

– Approved for use in more than 90 countries
– Considered safe by FDA and other organizations
– Some controversy around potential cancer risk based on animal studies, but results in humans are inconclusive


– Safe for most healthy adults in moderation
– Side effects like anxiety, insomnia, headaches in sensitive individuals
– Increased risk of high blood pressure, heart issues with excessive intake


– Amino acid with research showing positive effects on exercise performance
– Typically safe but long-term effects of high doses not well understood

B vitamins

– Essential nutrients, safe in doses found in energy drinks
– Potential side effects only with extremely excessive intake

Overall, having an occasional sugar free Red Bull is likely fine for most people. But moderation is key, as well as considering your personal caffeine sensitivity and health conditions.

Who Should Avoid or Limit Sugar Free Red Bull?

While sugar free Red Bull is likely safe for most healthy adults in moderation, certain groups should exercise more caution:

– Pregnant and breastfeeding women: Caffeine passes to the baby through the placenta and breastmilk. Recommended intake is under 200mg daily during pregnancy and while nursing.

– Children and teenagers: Should not consume caffeine energy drinks according to The American Academy of Pediatrics. Caffeine is unsafe and can be addictive for youth.

– Caffeine-sensitive individuals: People prone to migraines, anxiety, insomnia, digestion issues may want to limit or avoid caffeine.

– Those with heart conditions: Caffeine could increase risk of abnormal heart rhythms.

– People taking certain medications: Caffeine can interact with some antibiotics, antidepressants, blood pressure medications and more.

Always speak to your doctor about caffeine consumption if you have any health conditions or concerns. They can help determine safe intake levels.

The Bottom Line

A 12 oz sugar free Red Bull provides 114 mg of caffeine, which is slightly less than a regular Red Bull. This gives it an equivalent caffeine kick to other popular sugar free energy drinks.

While the artificial sweeteners are considered safe by health agencies in moderation, chugging multiple sugar free Red Bulls daily is not recommended. Caffeine side effects and potentially negative impacts on gut health are concerns.

An occasional sugar free Red Bull can be fine for a quick energy boost, especially if you have no caffeine sensitivity. But moderation is key. For some groups like children and pregnant women, even occasional consumption is not advised.

Overall, be mindful of your personal tolerance and health conditions when considering sugar free Red Bull or any caffeinated beverage.

Leave a Comment