For a smaller sugar-free can on Bonfire Night, Red Bull states that Sugarfree contains 80mg caffeine per 250ml can. If you prefer a 500ml zero-sugar drink, Monster states 150mg per can for Ultra and 160mg for Monster Energy Zero Sugar. Compare caffeine for the whole can, and check the current pack if you specifically require a “no added sugars” claim rather than sugar-free or zero-sugar wording.
For an evening event, the useful distinction is not just the sugar wording: can size and caffeine per can change what you are choosing.
If you want an energy drink rather than a regular sugar-sweetened option, compare the current pack’s sugar information as well as its size. Red Bull states 80mg caffeine in a 250ml Sugarfree can; Monster states 150mg in a 500ml Ultra can and 160mg in a 500ml Energy Zero Sugar can.
If you have already had tea, coffee or other caffeinated drinks, compare caffeine per whole can before choosing another drink for the evening. A sugar-free label does not tell you the caffeine amount.
If “no added sugars” is your requirement, check that wording and the ingredients on the exact can. A product described as “zero sugar” or “sugar-free” should not be assumed to carry the same claim.
Start with the sugar claim and nutrition panel, then compare caffeine for the amount you expect to drink. Use can size and flavour to choose between options that meet those requirements.
| Priority | What to check | Your needs |
|---|---|---|
| Sugar wording | Read the exact claim, sugars per 100ml and the ingredients. If “no added sugars” matters, look for that wording on the current pack rather than inferring it from “zero sugar”. | I want a drink that meets my specific sugar preference, not one chosen from the front label alone. |
| Caffeine | Check caffeine per whole can and account for other sources consumed that day. Red Bull states 80mg per 250ml Sugarfree can; Monster states 150mg per 500ml Ultra can and 160mg per 500ml Energy Zero Sugar can. | For an evening event, I want to know how much caffeine is in the can I might finish. |
| Can size and flavour | Choose the volume you intend to drink, then check the exact variant. Monster describes Ultra as citrus-flavoured and Energy Zero Sugar as an original-style option; its stated caffeine figures apply to the specified 500ml cans. | A smaller can may suit the amount I plan to drink, while I might prefer a larger can if I have checked its full-can caffeine amount. |
Sugar wording does not indicate caffeine per can. The Red Bull and Monster manufacturer figures above refer to different can sizes as well as different caffeine amounts.
Read the nutrition panel, ingredients and full-can caffeine declaration together. Check for the exact “no added sugars” wording if that is the claim you need.
Monster states 150mg caffeine in a 500ml Ultra can and 160mg in a 500ml Energy Zero Sugar can. Tea, coffee and other products can add to the amount consumed that day.
Check the full-can figure and consider what you have already consumed. For pregnancy, the NHS advises no more than 200mg caffeine a day from all sources.
Lucozade lists Zero Sugar Pink Lemonade, while it describes Alert separately as a high-caffeine range. The name of one range does not establish the caffeine content of a product in the other.
Check the exact Lucozade product’s caffeine declaration and nutrition panel before choosing it in place of an energy drink.
These examples help distinguish named product lines; a brand name alone does not establish the sugar or caffeine content of every variant.
Red Bull’s UK information states that a 250ml can of Red Bull Sugarfree contains 80mg caffeine.
Monster states 0g sugar and 150mg caffeine for its 500ml Ultra can, and 0g sugar and 160mg caffeine for its 500ml Energy Zero Sugar can.
Lucozade lists Zero Sugar Pink Lemonade and separately describes its Alert range as high caffeine.
Relentless has an energy-drink range, but the range name does not identify which current can, if any, meets a particular sugar preference.
These Joybuy options include smaller cans, 500ml zero-sugar varieties and a matcha drink to assess if “no added sugars” is your priority. Check the exact pack’s sugar wording and caffeine declaration before choosing, particularly where the variants differ from the manufacturer examples discussed above.
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A four-can option if you want a larger zero-sugar drink for the event. Monster states 0g sugar and 150mg caffeine per 500ml can for Ultra; count the full can when considering caffeine from other drinks. Check the current can for any specific “no added sugars” claim.
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A four-can pack for shoppers choosing a smaller sugar-free serving. Red Bull states 80mg caffeine per 250ml Sugarfree can. It contains caffeine and sweeteners; check the current can if you need particular sugar-claim wording.
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A cherry-flavoured matcha energy drink in four 250ml cans. If you are choosing it for a “no added sugars” preference, check that claim, the sugars figure and caffeine per can on the current pack; “no added sugars” does not mean zero sugars.
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A four-pack of 500ml cans for shoppers who prefer an original-style Monster flavour direction. Check caffeine per full can on this exact variant before buying; do not apply another Monster product’s figure to it. Check the current can for any specific “no added sugars” claim.
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A 355ml Monster Ultra variant if you want a can size between the 250ml and 500ml options. Check this Japan-version can’s sugar wording, nutrition information and caffeine per can rather than using figures for the 500ml UK Ultra product.
Do not treat the phrases as interchangeable claims. UK nutrition-claims legislation identifies “no added sugars” separately; check that exact wording and the ingredients on the can if it is your requirement. A “no added sugars” claim also does not, by itself, tell you that a drink contains zero sugars.
Of the specified manufacturer examples, Red Bull Sugarfree has the lower stated amount per can at 80mg per 250ml. Monster states 150mg per 500ml Ultra can and 160mg per 500ml Energy Zero Sugar can. Check the exact variant and compare the amount you intend to drink.
No UK-wide current ban follows from the announced England rule. The Department of Health and Social Care and Department for Education announced in July 2026 an England restriction on sales of drinks containing more than 150mg caffeine per litre to under-16s, planned from April 2027 subject to Parliamentary approval. For a purchase now, check the retailer’s present age policy and rules where you are buying.
Zero sugar does not remove caffeine. The NHS advises no more than 200mg caffeine a day during pregnancy, counting all sources. Monster states 150mg per 500ml Ultra can and 160mg per 500ml Energy Zero Sugar can, so check the exact can and include any other caffeine consumed that day.
Check the exact product before treating it as a substitute. Lucozade lists Zero Sugar Pink Lemonade and describes its separate Alert range as high caffeine; the Zero Sugar name alone does not establish that drink’s caffeine content or make it comparable to the energy drinks discussed here.