Small-can, zero-sugar buyers
If you would rather take a 250ml can than a 500ml one, Red Bull Sugarfree provides a defined serving. Red Bull states that each 250ml can contains 80mg caffeine.
Who is choosing a lunch drink?
The useful starting point is the size of drink you want with lunch, followed by whether you want sugar in it.
Buyers considering a larger zero-sugar can
Monster Ultra is a 500ml zero-sugar option. Monster Energy UK states 150mg caffeine per can, while a Tesco listing states 160mg, making the current can label important when comparing caffeine.
Buyers considering a drink with sugar
If sugar is acceptable for your lunch choice, compare the nutrition panels rather than assuming sparkling energy drinks have similar contents. Tesco lists 19.1g sugars per 500ml can of Lucozade Alert Original; Relentless describes White Citrus as containing sugar and sweetener.
What should you check?
Choose a can size that suits lunch, then read the sugars and caffeine amounts for the entire can—not just the figures per 100ml.
| Priority | What to check | Your needs |
|---|---|---|
| Can size | Check the volume of one can and the number of cans in a pack. Red Bull Sugarfree is available in 250ml cans, while Monster Ultra is described in a 500ml format. | I would rather carry a smaller can with lunch, or I want a larger drink and will check what that full serving contains. |
| Sugars and sweeteners | Read sugars per can and the ingredients list. Tesco lists 19.1g sugars per 500ml can of Lucozade Alert Original; Relentless describes White Citrus as containing sugar and sweetener. | I want to know whether I am choosing a zero-sugar drink or one that contains sugar, regardless of its flavour or branding. |
| Caffeine per can | Compare the full-can amount and count caffeine from other drinks or products that day. Red Bull states 80mg per 250ml Sugarfree can. For Monster Ultra 500ml, Monster Energy UK states 150mg and Tesco states 160mg, so check the current can. | Coffee, tea or another caffeinated drink may already be part of my day; the amount in this entire can matters more to my choice than its zero-sugar label. |
| Warnings | Read the warning on the specific can, particularly when choosing for a child or during pregnancy. The NHS advises no more than 200mg caffeine a day from all sources during pregnancy. | I need to check whether the drink carries a warning relevant to the person who will consume it, rather than treating a sugar-free label as a suitability claim. |
Common buying mistakes
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Assuming zero sugar means little caffeine
Sugar and caffeine are separate checks. Red Bull states 80mg caffeine per 250ml Sugarfree can; Monster Energy UK states 150mg for a 500ml Ultra can, while Tesco lists 160mg for Ultra.
Compare the caffeine amount for the whole can and include other caffeine you consume that day.
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Judging sugar content by flavour
A sparkling or citrus-flavoured energy drink is not necessarily sugar-free. Tesco lists 19.1g sugars per 500ml can of Lucozade Alert Original, and Relentless describes White Citrus as containing sugar and sweetener.
Use the sugars-per-can figure and ingredients list to distinguish it from a zero-sugar option.
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Relying on one caffeine figure for Monster Ultra
Monster Energy UK states 150mg caffeine for an Ultra 500ml can, whereas Tesco lists 160mg. Those figures should not be treated as an interchangeable specification for every can.
Read the caffeine declaration on the particular can you intend to buy.
Relevant brand options
These examples show different can sizes and sugar formulations; the details apply to the named drinks, not every product from each brand.
Red Bull
Red Bull Sugarfree is a 250ml option for someone seeking a smaller zero-sugar can with lunch.
- Red Bull states 80mg caffeine per 250ml Sugarfree can.
- Sugarfree still contains caffeine; check the warning on the can.
Monster
Monster Ultra is a 500ml zero-sugar option for buyers considering a larger sparkling drink.
- Monster Energy UK describes Ultra as zero sugar and lists a 500ml can.
- Monster Energy UK states 150mg caffeine per can, while Tesco lists 160mg; confirm the figure on the can you buy.
Lucozade
Lucozade Alert Original is a sparkling, sugar-containing choice for buyers comparing it with zero-sugar drinks.
- Tesco lists it in a 500ml format.
- The Tesco listing states 19.1g sugars per 500ml and identifies high caffeine content.
Relentless
Relentless White Citrus is a carbonated citrus-flavour energy drink to compare with the named zero-sugar options.
- Relentless describes White Citrus as containing caffeine and B vitamins.
- Relentless describes it as containing sugar and sweetener; read the can’s nutrition panel when comparing sugars.
Joybuy products to compare
These lunch-on-the-go options include smaller and larger cans, zero-sugar choices and a sugar-containing choice. Check the individual can’s label for the figures and warnings that matter to you.
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Red Bull Sugarfree 250ml, 4-pack
A smaller zero-sugar can to consider with lunch. The pack contains four 250ml cans, and Red Bull states 80mg caffeine per 250ml Sugarfree can. It contains sweeteners and caffeine; check the can’s warning before choosing it for someone else.
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CELSIUS Kiwi Guava, 12 × 355ml
A kiwi-and-guava option if you want a 355ml can with lunch; the pack contains twelve cans. Check the current can for its sugars and caffeine declaration. Its product warning identifies children, pregnant or breastfeeding women, and people sensitive to caffeine as groups for whom it is not suitable.
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Red Bull Energy Drink 250ml, 12-pack
Consider this if you want a 250ml can but are comparing a sugar-containing drink with sugar-free choices. The pack contains twelve cans. Read the sugars and caffeine amounts on the current can; its product warning says it is not recommended for children or pregnant or breastfeeding women.
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Monster Energy Green Zero Sugar, 12 cans
A zero-sugar option if you prefer a larger can with lunch. Check the volume and caffeine amount on the current can rather than using figures for a different Monster drink. Its product warning advises against use by children, pregnant or breastfeeding women, and people sensitive to caffeine.
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Monster Energy Ultra Zero Sugar, 4 × 500ml
A larger zero-sugar can for buyers who prefer the Ultra flavour profile; the pack contains four 500ml cans. Monster Energy UK and Tesco give different caffeine figures for Monster Ultra 500ml, so read this can’s caffeine declaration before deciding how it fits alongside other caffeinated drinks that day. Check its warning if choosing for someone else.
Questions about sparkling energy drinks
Does sugar-free mean caffeine-free?
No. Red Bull states that a 250ml Sugarfree can contains 80mg caffeine. Monster Ultra is zero sugar, but Monster Energy UK states 150mg caffeine per 500ml can while Tesco lists 160mg, so check the current can when comparing them.
What should I check if I am pregnant?
Check the drink’s warning and count caffeine from all sources, not just the lunch drink. The NHS advises no more than 200mg caffeine a day during pregnancy; a sugar-free label does not mean that an energy drink is caffeine-free or suitable during pregnancy.
How can I tell whether a sparkling energy drink contains sugar?
Read the sugars figure on the nutrition panel for the full can, alongside the ingredients list. Monster Energy UK describes Ultra as zero sugar, Tesco lists 19.1g sugars per 500ml can of Lucozade Alert Original, and Relentless describes White Citrus as containing sugar and sweetener.