Quick answer: the best energy drink for work has a moderate caffeine dose (75 to 150mg), under 5g of sugar, and is easy to sip at a desk over an hour rather than downed in five minutes. One can mid-morning or after lunch, plus water through the day, covers most long workdays without feeling hyper.
Energy drinks for work compared
| Drink | Caffeine | Sugar | At a desk |
|---|---|---|---|
| Mug of coffee | About 100 to 140mg | None, unless added | Quick, but goes cold in a long meeting |
| Red Bull (250ml) | 80mg | 27.5g | Gone in minutes |
| Monster Energy (500ml) | 160mg | 55g | A lot of sugar for one afternoon |
| PÜRCHARGE (330ml) | 125mg | 3.8g | Still, sipped over an hour |
Figures from UK retailer listings, October 2026. Recipes change, so check the can.
How to time it through the day
- Morning: your usual coffee, or nothing if you slept well.
- Mid-morning or after lunch: one can, sipped over an hour, when focus usually dips. See why you can't focus after lunch.
- Late afternoon: water only if you want to sleep well.
- All day: keep a glass of water on the desk.
Why you can't concentrate at work
- Short sleep the night before.
- A heavy, carb-loaded lunch.
- Too much caffeine too fast, which feels busy rather than focused.
- Hours of notifications and no breaks. Block out time and step away every hour or so.
More on this in best focus drinks.
Where PÜRCHARGE fits
Built for the long middle of the day. Each still 330ml can has 125mg of caffeine from green coffee, 3.8g of sugar, stevia, green tea extract (a natural source of L-theanine), enXtra®, rhodiola, Panax ginseng, electrolytes and nine vitamins. Caffeine contributes to increased alertness and improved concentration. Not for under-16s, pregnant or breastfeeding women. Max two cans a day.
See our productivity drink page. Stocking an office? We sell by the case.
FAQs
Do energy drinks increase productivity at work?
The caffeine contributes to increased alertness and improved concentration, which helps with focused work. It doesn't replace sleep, breaks or a sensible lunch.
What's the best energy drink for the office?
One with a moderate caffeine dose, little sugar and no fizz, so you can sip it at your desk without a sugar slump later.
How many energy drinks can I have at work?
Count all your caffeine, coffee included, and stay under 400mg a day. For PÜRCHARGE, that's no more than two cans.
