Office workers cutting back on sugar
A zero-sugar can keeps the energy-drink format without the sugar, but the caffeine amount still matters. Compare the nutrition panel and the caffeine stated for the entire can, not just its front label.
Who is choosing?
The useful comparison changes depending on whether the drink is for one desk break or a shared office kitchen.
People who also drink coffee or tea
An energy drink is another source of caffeine during the working day. Red Bull lists 80mg per 250ml Sugarfree can and Monster lists 150mg per 500ml Ultra can, so can size affects the amount added to other drinks.
People stocking an office kitchen
Multipacks make it easy to keep cans available, but one caffeine level will not suit every colleague. Keep the individual cans and their ingredient and caffeine warnings identifiable when choosing drinks for a shared space.
What should you check?
Start with the sugar declaration, then compare caffeine for the amount you would actually drink. Choose a pack format only after those two checks.
| Priority | What to check | Your needs |
|---|---|---|
| Sugar and ingredients | Read sugars per 100ml and per can on the nutrition panel. Check the ingredient list if particular sweeteners matter to you; sugar-free does not mean sweetener-free. | I want a canned office drink without sugar, but I still want to know what is in the one I choose. |
| Caffeine per can | Compare mg for the whole container. Red Bull lists 80mg in a 250ml Sugarfree can; Monster lists 150mg in a 500ml Ultra can. Include coffee, tea and other caffeine sources in your day. | With coffee or tea already part of my workday, I need to know what one more can would add. |
| Serving and pack size | Distinguish can volume from the number of cans in a multipack. A 250ml can and a 500ml can are different servings even when both drinks are labelled zero sugar. | A smaller can may suit my desk break; for a shared kitchen, I also need a pack size that fits how the drinks will be used. |
| Who will drink it | Read the specific can’s caffeine warning before stocking it for others. The NHS notes that caffeine sensitivity varies with how much and how often someone consumes it. | If colleagues have different caffeine needs, I do not want to assume that every zero-sugar can suits everyone. |
Common buying mistakes
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Reading “zero sugar” as “zero caffeine”
Red Bull Sugarfree and Monster Ultra still contain caffeine: their brands list 80mg per 250ml can and 150mg per 500ml can respectively. Either drink adds to caffeine from coffee or tea.
Check caffeine in mg per whole can when deciding whether it fits your day.
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Assuming every “zero” claim means the same thing
A zero-sugar statement does not establish the drink’s caffeine amount or whether it contains sweeteners. Different products also come in different serving sizes.
Read the nutrition panel and ingredients on the exact product rather than relying on the wording on the front of the can.
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Treating a large can like a small serving
Monster lists 150mg caffeine in a 500ml Ultra can, compared with Red Bull’s 80mg in a 250ml Sugarfree can. Comparing the whole cans gives a different picture from comparing their labels alone.
Decide what can size you intend to drink, then compare its total caffeine with your other drinks.
Brands and retail ranges
These references describe specific drinks or listed ranges, not every product made or stocked under each name.
Red Bull
Red Bull Sugarfree is a small-can energy-drink option for a desk break.
- Red Bull lists 80mg caffeine per 250ml Sugarfree can.
- Sugarfree is not caffeine-free; check the ingredients if sweeteners matter to you.
Monster
Monster Ultra offers a larger zero-sugar energy-drink can.
- Monster lists zero sugar and 150mg caffeine per 500ml Ultra can.
- The whole 500ml can contributes more caffeine than the 250ml Red Bull Sugarfree can described here.
Lucozade
Lucozade describes its Zero range as zero-sugar soft drinks for shoppers who are not necessarily choosing by an energy drink’s caffeine amount.
- The range gives another zero-sugar drink format to consider.
- Check the caffeine information on the particular Lucozade Zero product before comparing it with an energy drink.
Relentless
Check the exact Relentless product rather than treating the brand name as a sugar-free designation.
- Relentless Energy’s Guava product information says it is not recommended for children, caffeine-sensitive people, pregnant women or women who are nursing.
- Read the nutrition panel on any Relentless can before considering it for a zero-sugar selection.
Tesco
Tesco Groceries lists Red Bull Sugar Free and Monster Ultra in its sugar-free energy and stimulant drinks category.
- The category brings several sugar-free formats together for comparison.
- Use the individual product label for the ingredients, nutrition and caffeine of the can you choose.
Sainsbury's
Sainsbury’s Groceries lists zero-sugar options including Blue Bolt Zero, Monster Ultra and Red Bull Sugar Free.
- Its listed range includes both smaller and larger can formats.
- Compare the details of each drink rather than assuming the listed options have the same caffeine content.
Joybuy product options
These Joybuy options cover a smaller Red Bull Sugarfree can and multipacks of larger zero-sugar Monster cans for office snacks or a shared kitchen. Compare caffeine per can as well as the number of cans in the pack.
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Red Bull Sugarfree 250ml 4 Pack
The 250ml cans suit someone choosing a smaller zero-sugar serving for a desk break. Red Bull lists 80mg caffeine per 250ml Sugarfree can; include it alongside other caffeine sources during your day.
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Monster Energy Ultra Zero Sugar 6x4x500ml
This multipack provides 500ml zero-sugar cans for people deliberately choosing a larger serving. Monster lists 150mg caffeine per 500ml Ultra can, so account for coffee, tea and other caffeine sources too.
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Monster Energy Green Zero Sugar x12 Cans
The 12-can pack is an option when stocking zero-sugar drinks for a shared space. Read the individual can’s caffeine warning and nutrition panel before choosing it for colleagues; zero sugar alone does not establish a calorie figure.
Questions about zero-sugar drinks
Does zero sugar mean an energy drink has no caffeine?
No. Red Bull lists 80mg caffeine per 250ml Sugarfree can, and Monster lists 150mg per 500ml Ultra can. Check sugar and caffeine separately on the exact drink.
How should I account for caffeine from an office drink?
Count caffeine from the whole can alongside coffee, tea and other sources. In its 2015 assessment, the European Food Safety Authority stated that daily caffeine intakes up to 400mg from all sources do not raise safety concerns for adults in the general population, except pregnant women; that figure is not a target, and individual sensitivity varies.
Does a zero-sugar energy drink suit someone who is pregnant?
A zero-sugar drink can still contain caffeine, so do not decide from its sugar label alone. Read the warning on the particular can and account for caffeine from other drinks and foods; the Red Bull Sugarfree product listing advises against use during pregnancy.
Is Lucozade Zero interchangeable with a zero-sugar energy drink?
Not automatically. Lucozade describes its Zero range as zero-sugar soft drinks, but the caffeine amount needs checking on the specific product before comparing it with Red Bull Sugarfree or Monster Ultra.