An energy supplement is a food supplement that delivers caffeine, and usually a few supporting ingredients, in a measured dose. In the EU it is regulated as a food, not a medicine, which means it can be sold without proving that it works. That single fact explains almost everything strange about this category.

What follows is the guide we wanted when we started this. What is actually in these products, how to read a label, and where the legal line sits. Then our own label, tested against the same standard.

Why most energy supplement labels are unreadable

Three tricks account for the majority of it.

The proprietary blend. A list of eight impressive ingredients, one total weight, no individual doses. Legally permitted. Practically, it means the brand can put 900mg of cheap filler and 4mg of the ingredient you came for into the same 904mg "Focus Matrix" and never tell you. If a dose is worth having, it is worth printing.

The big number. "1000mg of guarana" sounds like ten times more than "100mg of guarana extract". It usually isn't. Raw powder and concentrated extract are different things, and a label that doesn't tell you which is which has told you nothing.

The claim that isn't. Words like enhances, boosts, optimises, unlocks. They sound like health claims. They are carefully not health claims, because a real one would have to be authorised. More on that below, because it's the part that actually matters.

The four ingredients

Nearly every energy supplement is caffeine plus a supporting cast. Ours has four ingredients, and each one gets its own page, because each deserves a straight answer. Three of them carry a dose and no permission to describe it. One carries both.

• Caffeine capsulesThe active ingredient in almost every energy product. Dose ranges, the EFSA reference intakes, and why per-capsule and per-serving are not the same number.
• Guarana capsulesAn Amazonian seed that carries caffeine naturally. Extract versus powder, and why the big number on the front is usually the wrong one.
• Taurine supplementIn every energy drink, and almost nobody can tell you why. What it is, what the evidence says, and the myth about where it comes from.
• Vitamin CThe only ingredient EU law lets us say anything good about. What it does, in the Commission's own authorised wording, and why we use 560mg rather than 1000mg.

That asymmetry is worth sitting with. Caffeine, guarana and taurine each have a dose printed on our label and no authorised claim attached to them anywhere in Europe. Vitamin C has both. It is the reason the formula is legal to describe at all, and we included 560mg of it, 700% of the Nutrient Reference Value, on purpose.

How to read any energy supplement label

Eight questions. If a label cannot answer them, the label is the answer.

The claims problem, which nobody in this category wants to discuss

In the EU, a food supplement may only make a health claim if that exact claim has been authorised under Regulation (EC) No 1924/2006. Not "backed by research". Not "studies suggest". Authorised, by name, on a public register that anybody can read.

Here is where the four ingredients in our formula actually stand:

• Caffeine. Claims about caffeine, alertness and attention were assessed by EFSA and were not authorised for use. So no legitimate EU brand may tell you caffeine improves your concentration. Including us.
• Guarana. A botanical. Botanical claims sit in a legal holding pattern: submitted years ago, put on hold, never authorised. Some brands use them anyway and rely on that gap.
• Taurine. No authorised claims. None.
• Vitamin C. Authorised. Reduction of tiredness and fatigue. Normal energy-yielding metabolism. Normal psychological function. Normal functioning of the nervous system.

So when a supplement page tells you its capsules will sharpen your focus or unlock deep work, one of three things is true. It isn't selling into the EU. It is relying on the botanical loophole. Or it is quietly betting that nobody checks.

People do check. In 2023 the Berlin Regional Court ruled against a German supplement brand on exactly this point, and held that the total impression of the page mattered more than whether any single sentence was defensible. The product's own name formed part of the ruling.

We took the other road. Show the doses, cite the one claim we are entitled to, and let you decide. It is a worse sales pitch and a better product page.

Tools

Free, no sign-up, and deliberately built so that they can talk you out of a purchase as easily as into one.

• Free toolCaffeine half-life calculatorAdd what you drank and when. See the curve across the day, how your total sits against the EFSA reference intakes, and how much caffeine is still in your bloodstream when you go to bed. It never tells you that you have room for more.

Choosing one

• Energy drink alternativeThe caffeine without the can. What a 250ml energy drink actually contains, and what a capsule leaves out.
• Supplements and brain fogWhat brain fog is, what actually causes it, and an honest look at whether a supplement is the right answer. Often it isn't.

Aurora Flow Energy Complex, in full

Questions people actually ask

What is an energy supplement?

A food supplement that delivers caffeine, and usually some supporting ingredients, in a measured dose. It's regulated as a food in the EU, not as a medicine. Formats include capsules, tablets, powders and shots. The common thread is caffeine.

What should I look for in a good one?

Every active listed in mg, no proprietary blends, the total caffeine per daily dose stated clearly, and a short ingredient list. If a brand won't tell you a dose, assume there's a reason. That's the whole test, and most products fail it.

Do energy supplements actually work?

Caffeine has a well-documented effect on wakefulness. That is not in dispute scientifically. What is in dispute is whether the other ingredients in most formulas add anything, and the EU has not authorised health claims for caffeine, guarana or taurine. So we'll say the honest thing: you are mostly buying a measured dose of caffeine, and you should know what that dose is.

Capsules or energy drinks?

A capsule gives you the caffeine without the sugar, the sweeteners, the carbonation or the 250ml of liquid. It also gives you a dose you can actually rely on. We go through the comparison on the energy drink alternative page.

Are energy supplements safe?

The main variable is caffeine. EFSA considers single doses up to 200mg, and habitual intakes up to 400mg per day, not to raise safety concerns for most healthy adults. Pregnancy is different: 200mg per day total. Everything else depends on the specific formula, which is another reason to want the doses printed. See how much caffeine is too much.

Are they vegan?

Often not, and usually because of the capsule shell rather than the contents. Gelatin is made from animal collagen. Pullulan and HPMC are plant-derived. Check the shell, not just the actives.

When should I take one?

Caffeine has a half-life of roughly five to six hours in most adults, which means half of it is still in you five hours later. Take that into account if you sleep at a normal hour. How long does caffeine last works through the arithmetic, and the caffeine calculator will do it for your own day and your own bedtime.

Everything else on this site

• Caffeine half-life calculator: see what's still in you at bedtime
• Caffeine capsules: dose ranges and the EFSA reference intakes
• Guarana capsules: extract vs powder, and how to read the label
• Taurine supplement: what it is, and the myth about where it comes from
• Vitamin C: 560mg, 700% NRV, and the only claim we're allowed to make
• Energy drink alternative: the caffeine without the can
• Supplements and brain fog: an honest look at the evidence
• Clean energy without the crash: what the phrase actually means
• How much caffeine is too much? The EFSA reference intakes
• Aurora Flow Energy Complex: 60 capsules, four ingredients, every dose disclosed