Energy drinks

It depends on the format far more than on the brand. Small cans sit near a mug of instant coffee, while large cans and shots can be more than double that. Always read the can rather than assuming, and remember imported versions are often stronger than the UK equivalent of the same product.

European and UK guidance works with two numbers: a daily total and a single dose. Energy drinks are only one part of that total, so count your coffee, tea, cola and dark chocolate as well. The values below are official reference figures, not personal advice.

Pick the format that matches how predictable your day is. Cans give you a fixed dose with no preparation. Powders let you adjust the scoop and usually cost less per serving. Shots win on volume when you are on the road.

Caffeine takes roughly 30 to 45 minutes to reach its peak, so drink it before the task, not during the slump. For training, one serving in the 30 minutes beforehand is the usual pattern. In the evening, be conservative: a single dose of about 100 mg close to bedtime can already make it take longer to fall asleep, and poor sleep tends to cost you more the next day than the can gave you. If you train late, a lower dose or a caffeine-free alternative is the sensible swap.

For daily use, yes, in one specific way: you skip the sugar and the calories that come with a full-sugar can. What does not change is the caffeine, and that is the part most people underestimate. A zero sugar can with 200 mg of caffeine is still a 200 mg dose. Sweeteners used in these drinks are approved for use in the UK and EU, so the practical choice is taste. If you dislike a particular sweetener, try a powder where you can dilute it more.

You can, but add the numbers up first. A 200 mg can plus a scoop of pre-workout at 200 mg already puts you at the 400 mg daily reference for healthy adults, before your morning coffee. Stacking also tends to be where jitters, a racing heart rate and a rough comedown come from. The simple rule we give: one stimulant product per day, and pick the one that fits the task. On training days, choose either the can or the pre-workout, not both.

No. High-caffeine drinks must carry the wording that they are not recommended for children or for pregnant or breastfeeding women, and UK soft drinks makers also follow a voluntary code not to market them to under-16s. In pregnancy, NHS advice is to stay under 200 mg of caffeine a day from all sources, and a single large can can use up most of that on its own. If you want the flavour and the ritual without the caffeine, an electrolyte or vitamin drink is the practical alternative.

They do different jobs, and only some are backed by approved claims. Riboflavin contributes to the reduction of tiredness and fatigue, and vitamin B12 contributes to normal energy-yielding metabolism, which is why B vitamins appear on almost every can. Taurine and glucuronolactone are present at levels that EFSA judged unlikely to interact adversely with caffeine, but they carry no approved health claim, so treat them as formula ingredients rather than reasons to buy. L-theanine supplements are the one addition people mention most often for taking the edge off a high dose. Expect a smoother feel, not a different dose.