Adults seeking a zero-sugar energy drink
If you want caffeine without sugar, compare the amount in a whole can as well as the can size. A zero-sugar label does not mean caffeine-free.
Who is choosing the drinks?
Hosts serving mixed-age guests
Keep caffeinated energy drinks distinct from general refreshments, and offer other choices for children and guests who avoid caffeine. The drink selected for an adult does not have to be the default for everyone.
Guests who need to limit caffeine
Caffeine from the party drink adds to caffeine consumed elsewhere. NHS guidance says not to have more than 200 mg of caffeine a day during pregnancy; guests who are pregnant, breastfeeding or sensitive to caffeine should check the drink label rather than relying on its sugar claim.
What should you check before buying?
Choose the type of drink first, then compare the exact can and pack you intend to serve. A zero-sugar claim answers a different question from caffeine content.
| Priority | What to check | Your needs |
|---|---|---|
| Sugar and drink type | Check the sugar declaration on the exact product. Red Bull Sugarfree and Monster Zero-Sugar are energy-drink options; Lucozade describes its Zero range as zero-sugar sparkling drinks. Do not assume these drinks have equivalent caffeine content. | I want a zero-sugar choice, but I need to decide whether I actually want a caffeinated energy drink or another refreshment. |
| Caffeine per can | Compare the whole-can amount and can size. Red Bull states 80 mg per 250 ml Sugarfree can. Monster Energy UK states 160 mg per 500 ml Zero-Sugar can, while a Tesco listing for a similarly named product states 180 mg per 500 ml; use the declaration on the pack selected. | A smaller individual can may suit my serving plan better than a large can. I also need to account for caffeine from tea, coffee and other drinks that day. |
| Guest suitability | Read caffeine warnings and do not treat zero sugar as evidence that a drink suits every guest. NHS guidance limits caffeine during pregnancy to 200 mg a day from all sources. | I am serving people with different needs, including children or guests who avoid caffeine, so I want clearly identifiable alternatives to energy drinks. |
| Pack and delivery | Check can count, can size, flavour, best-before date, live stock and delivery for the party location. A retailer category listing does not confirm that a particular pack can be delivered. | I need enough suitable individual servings without choosing a multipack before checking what each can contains. |
What can catch a host out?
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Reading “zero sugar” as “no caffeine”
Red Bull Sugarfree and Monster Zero-Sugar are both caffeinated drinks. Sugar content alone cannot tell you how much caffeine a guest would consume.
Read the caffeine amount for the whole can and consider other caffeine consumed that day.
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Using one caffeine figure for every similarly named can
Monster Energy UK states 160 mg per 500 ml Zero-Sugar can, whereas a Tesco listing for a similarly named product states 180 mg per 500 ml. The figures should not be transferred between packs.
Check the caffeine declaration on the exact can or product listing you choose.
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Making energy drinks the default for every guest
A zero-sugar energy drink can still carry a high-caffeine warning. That matters when refreshments are being shared among adults and children or with guests who avoid caffeine.
Separate caffeinated cans from general refreshments and provide other drinks that guests can identify easily.
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Treating a retailer range as a stock guarantee
A product shown in a retailer category is not necessarily available for a particular delivery address or order date.
Check the exact pack’s live stock, delivery details and best-before information before placing a party order.
Which brands are relevant?
Red Bull
Red Bull Sugarfree is a zero-sugar energy drink offered in 250 ml cans.
- Red Bull states that each 250 ml Sugarfree can contains 80 mg caffeine.
- It contains caffeine, so the sugar-free name does not make it a caffeine-free party drink.
Monster Energy
Monster has 500 ml zero-sugar energy-drink products.
- Monster Energy UK states 0 g sugar and 160 mg caffeine per 500 ml can for its Zero-Sugar product.
- A Tesco listing for a similarly named 500 ml product states 180 mg caffeine. Check the selected can rather than applying either figure to every variant.
Lucozade
Lucozade describes its Zero range as zero-sugar sparkling drinks, including Original, Orange, Pink Lemonade and Tropical.
- The range offers a zero-sugar refreshment route when an energy drink is not required.
- Check the exact drink’s label if caffeine content is important; the range name does not establish equivalence to a caffeinated energy drink.
Relentless
Relentless is an energy-drink brand whose where-to-buy page names UK grocery retailers.
- Relentless lists Tesco and Sainsbury's among its retailers.
- Its Guava product information describes a caffeinated drink, not a confirmed zero-sugar option; check the exact flavour and label.
Tesco
Tesco is a retailer with a sugar-free energy and stimulant drinks category, rather than an energy-drink manufacturer.
- Its category lists products including Red Bull Sugar Free and Monster Zero Sugar for pack-size comparison.
- Check the chosen product listing and delivery details before relying on a category result for a party order.
Sainsbury's
Sainsbury's is named on Relentless’s UK where-to-buy page as a retailer.
- It is a retailer to check when looking for a particular Relentless drink.
- Confirm the exact flavour, pack and availability before planning around it.
Joybuy zero-sugar energy drink options
These are caffeinated, zero-sugar energy-drink options in multipacks for adult guests. Compare the size and caffeine declaration of the exact cans you plan to serve; choose other refreshments separately for guests who do not want an energy drink.
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CELSIUS Watermelon Strawberry, 12 × 355 ml
A multipack of individual cans for adults choosing a zero-sugar energy drink. Check the caffeine declaration on the cans when planning servings, and keep them separate from drinks for children or guests avoiding caffeine.
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Red Bull Sugarfree, 12 × 250 ml
Individual 250 ml cans for adults who want a smaller zero-sugar energy-drink serving. Red Bull states that Sugarfree contains 80 mg caffeine per 250 ml can; count caffeine from other sources too.
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Red Bull Sugarfree, 4 × 250 ml
A four-can pack when fewer individual servings are needed. Red Bull states that each 250 ml Sugarfree can contains 80 mg caffeine; it is not a caffeine-free alternative for guests avoiding energy drinks.
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Monster Energy Green Zero Sugar, 12 cans
A 12-can zero-sugar energy-drink option for adults choosing Monster. Check the size and caffeine declaration on this exact variant: figures for similarly named Monster zero-sugar products should not be treated as interchangeable.
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Red Bull Sugarfree, 24-pack
A larger pack of individual zero-sugar energy-drink cans for adult guests. Check the can size on the selected pack; Red Bull states 80 mg caffeine for each 250 ml Sugarfree can.
Questions about party drinks
Does zero sugar mean an energy drink has no caffeine?
No. Red Bull states that Sugarfree contains 80 mg caffeine per 250 ml can, and Monster’s zero-sugar energy drinks are also caffeinated. Read the amount for the whole can, not just the sugar declaration.
What caffeine amount should a healthy adult consider?
The European Food Safety Authority’s 2015 assessment says that daily caffeine intake from all sources up to 400 mg does not raise safety concerns for the general healthy adult population, excluding pregnant women. That assessment does not cover people with diseases or medical conditions, so it is not a personal allowance for every guest.
What should pregnant guests know about these drinks?
NHS guidance says not to have more than 200 mg caffeine a day during pregnancy, counting all sources. High-caffeine drink warnings also say they are not recommended for pregnant or breastfeeding women; a guest who wants to avoid caffeine should check the exact alternative drink’s label.
Are sales of high-caffeine energy drinks to under-16s banned across the UK?
Do not treat the announced change as a UK-wide ban. On 16 July 2026, the Department of Health and Social Care and Department for Education announced an intended England-only ban on sales of high-caffeine energy drinks to under-16s from April 2027, subject to Parliamentary approval. That announcement does not establish the same rule for Scotland, Wales or Northern Ireland.
When does a multipack make sense for a street party?
Choose a multipack after checking how many guests want that specific drink and what each can contains. Confirm the flavour, can size, caffeine warning, best-before information, stock and delivery details for the exact pack before ordering.