Night-shift workers avoiding sugar
Zero sugar does not settle the caffeine question. Tesco lists 0g sugar in both Red Bull Sugarfree 250ml and Monster Ultra 500ml, but their stated whole-can caffeine amounts are 80mg and 160mg respectively.
Who is choosing?
The useful distinction is whether you want to avoid sugar, choose a smaller can or make room for a sweetened flavour.
Shoppers choosing a smaller can
If you would rather buy a 250ml can than a 500ml one, compare the caffeine amount for that can, not just the figure per 100ml. Tesco lists Red Bull Sugarfree at 32mg per 100ml, or 80mg in its 250ml can.
Shoppers considering sweetened flavours
Check sugars for the full container when choosing a larger sweetened drink. Tesco lists 19.1g sugars in a 500ml Lucozade Alert Original can and 19g in a 500ml Relentless Origin can.
What should you check?
Start with the amount in one can, then compare the sugar information and warnings on the particular drink you intend to buy.
| Priority | What to check | Your needs |
|---|---|---|
| Whole-can caffeine | Read the can volume and caffeine figure together. Tesco lists 80mg per 250ml Red Bull Sugarfree can and 160mg per 500ml Monster Ultra can. | I would rather know how much caffeine is in the can I am buying than compare per-100ml figures alone. |
| Sugar | Compare sugars per can as well as per 100ml. Tesco lists 0g in Red Bull Sugarfree 250ml and Monster Ultra 500ml, versus 19.1g in Lucozade Alert Original 500ml and 19g in Relentless Origin 500ml. | If I am avoiding sugar, I need to check that separately from caffeine. If I choose a sweetened flavour, I want to see its full-can sugar amount. |
| Can size | Check whether the listing is for 250ml, 355ml or 500ml cans, and confirm the number of cans in a multipack. | A smaller can may suit me when I do not want to open a 500ml drink; a larger can is a separate choice, not just a different brand. |
| Warnings and timing | Read the high-caffeine warning and ingredients, and consider caffeine from other drinks. The Health and Safety Executive advises stopping if you feel sleepy while driving after a shift and taking a short nap where safe. | I need to think about when my shift ends and whether I will be driving afterwards, rather than treating a drink as a substitute for sleep. |
Common buying mistakes
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Comparing caffeine only per 100ml
The same concentration can produce different amounts in different can sizes. Tesco lists Red Bull Sugarfree at 32mg per 100ml, giving 80mg in its 250ml can; its Monster Ultra listing states 160mg in a 500ml can.
Look for caffeine per can. If a label gives only a per-100ml figure, use the can volume to work out the amount you would drink.
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Reading “zero sugar” as “less caffeine”
Tesco lists Monster Ultra 500ml with 0g sugar and 160mg caffeine per can. Sugar and caffeine are separate label details.
Check both figures before choosing a zero-sugar drink, particularly when comparing different can sizes.
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Overlooking sugar in a sweetened 500ml can
Tesco lists 19.1g sugars per 500ml Lucozade Alert Original can and 19g per 500ml Relentless Origin can.
Compare the nutrition panel for the whole can if sugar affects your choice; then check its caffeine amount separately.
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Assuming a familiar product name means the same pack
Single cans and multipacks can share a drink name while containing different numbers of cans. A retailer listing may also change before you order.
Confirm the exact can size, pack count, current availability and any delivery age restriction on the product page.
Brand examples
These examples describe particular drinks and can sizes, not every product made by each brand.
Red Bull
Red Bull Sugarfree is a compact, zero-sugar example in Tesco’s 250ml listing.
- Tesco lists 0g sugars and 32mg caffeine per 100ml, equivalent to 80mg in the 250ml can.
- It contains sweeteners and carries a high-caffeine warning; sugar-free does not mean caffeine-free.
Monster Energy
Monster Ultra represents a larger zero-sugar can in Tesco’s 500ml listing.
- Tesco lists 0g sugars and 160mg caffeine per 500ml can.
- Someone choosing it instead of a smaller can should account for the full-can caffeine amount.
Lucozade
Lucozade Alert Original is a sweetened 500ml energy-drink example.
- Tesco lists 19.1g sugars per can and 32mg caffeine per 100ml.
- Check availability before planning to buy this particular drink.
Relentless
Relentless Origin is another sweetened 500ml option.
- Tesco lists 19g sugars per 500ml can.
- Its listing includes a high-caffeine warning; check the current can before choosing it.
Joybuy product options
These Joybuy listings cover compact and larger cans, including sugar-free and sweetened drinks. Check the individual can and multipack details before ordering.
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Monster Energy Ultra Zero Sugar 4 × 500ml
A larger zero-sugar can option for shoppers comparing full-can caffeine amounts. Tesco lists 160mg caffeine per 500ml Monster Ultra can; check the label on this multipack for its current ingredients and warnings.
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Red Bull Sugarfree 250ml 4 Pack
A compact sugar-free option when you would rather open a 250ml can. Tesco lists 80mg caffeine per 250ml Red Bull Sugarfree can; check the current can for sweeteners and its high-caffeine warning.
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Red Bull Energy Drink 250ml 12 Pack
A compact-can option if you are considering a drink that is not labelled sugar-free. Check caffeine and sugars per 250ml can, as well as the pack count, before comparing it with other listings.
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Rockstar Blueberry & Pomegranate 12 × 500ml
A larger-can flavour option for a night-shift snack. Check caffeine and sugars per 500ml can on the current label rather than assuming they match another drink of the same size.
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CELSIUS Kiwi Guava 12 × 355ml
A 355ml-can option between the listed 250ml and 500ml formats. Check the current can’s caffeine, sugars and use warnings, especially if the end of your shift is close to when you intend to sleep.
Questions about buying and use
Does zero sugar mean less caffeine?
No. Tesco lists 0g sugar in both Red Bull Sugarfree 250ml and Monster Ultra 500ml, but their stated caffeine amounts are 80mg and 160mg per can respectively. Check caffeine and can volume independently of the sugar label.
Can an energy drink make driving home after a night shift safe?
No drink makes sleepy driving safe. The Health and Safety Executive describes caffeine or energy drinks as an occasional measure after a long or night shift, but advises stopping if you feel sleepy and taking a short nap where safe.
Should I check the can if I have bought the drink before?
Yes. Check the current can for its size, caffeine, sugars, ingredients and warnings. A familiar drink name alone does not tell you the amount in a differently sized can or the number of cans in a multipack.