There is exactly one sentence about tiredness that a European supplement brand can print without a lawyer wincing:
Vitamin C contributes to the reduction of tiredness and fatigue.
That's it. Not "fights fatigue." Not "beats tiredness." Not "restores your energy." That specific string of words, authorised under Commission Regulation (EU) No 432/2012, is the whole permitted vocabulary.
Most brands treat this as a nuisance to route around. We think it's the most interesting thing about the ingredient, because the claim exists at all — and for caffeine, guarana and taurine, nothing comparable does.
What "authorised" actually means
Under Regulation (EC) No 1924/2006, health claims on food are banned by default. Not restricted. Banned. A claim becomes legal only if the European Commission has put it on a list, after EFSA has assessed the evidence and agreed the causal relationship holds up.
Commission Regulation (EU) No 432/2012 is that list. It runs to about 40 pages and covers roughly 220 claims, out of more than 44,000 that member states originally submitted. Most were rejected.
Vitamin C survived the process for around fifteen separate functions. The ones relevant if you're tired at 3pm:
- Vitamin C contributes to normal energy-yielding metabolism
- Vitamin C contributes to the reduction of tiredness and fatigue
- Vitamin C contributes to normal psychological function
- Vitamin C contributes to normal functioning of the nervous system
Others cover collagen formation, immune function, protection of cells from oxidative stress, iron absorption, and the regeneration of vitamin E.
The wording is not a suggestion. Article 10 requires claims to be used as authorised, and German courts have taken a hard line on paraphrase — which is why you'll see the same slightly stiff phrasing across every compliant European label. It reads like legalese because it is.
The condition nobody mentions
Every authorised vitamin claim carries a condition of use, and for vitamin C it's this: the claim may only be used on a food that is at least a source of vitamin C.
"Source of" has a legal definition too. Under the Annex to Regulation 1924/2006, it means at least 15% of the Nutrient Reference Value per portion. The NRV for vitamin C is 80mg, so the threshold is 12mg.
That's a low bar, and it's worth knowing, because it means the claim on the front of a product tells you nothing about dose. A capsule with 12mg of vitamin C and a capsule with 500mg can print the identical sentence.
If you want to know what you're getting, the claim is the wrong place to look. The nutrition table is the right one.
What the claim does not say
Here's where it gets genuinely interesting, and where most category content quietly cheats.
"Contributes to the reduction of tiredness and fatigue" is a statement about metabolic function in a body that has enough vitamin C. It is not a statement that more vitamin C produces more of the effect. EFSA assessed whether the nutrient plays a causal role in normal metabolism. It did not assess whether loading up on it makes a well-nourished person feel less tired.
Those are different questions, and the second one has a much less flattering answer. Vitamin C absorption is saturable — the body's uptake efficiency drops sharply as doses climb, and surplus is largely excreted. Deficiency causes fatigue. Correcting deficiency resolves it. Going well past sufficiency mostly produces expensive urine.
The German Nutrition Society puts adult requirements at around 110mg per day for men and 95mg for women, rising to 155mg and 135mg for smokers. Those numbers are reachable from food without much effort.
So the honest version is: if you are low, vitamin C matters to how tired you feel. If you are not, the claim is still true and still legal, and it will still not do much for you.
We would rather say that than let you infer something better.
Why the other three ingredients get no sentence at all
Aurora Flow contains four things: caffeine 180mg, guarana extract 60mg, taurine 400mg, vitamin C 560mg per daily dose of two capsules.
Only the last one has an authorised claim.
Caffeine. EFSA assessed claims for alertness and concentration. The Commission did not authorise them for general use. You will still find "caffeine improves concentration" printed across the category, including — until we corrected it — in our own older articles. It was wrong there too.
Guarana. Sits in the botanical holding pattern: a batch of plant-based claims left unresolved when the Commission paused assessment of botanicals. Unresolved is not authorised. Nothing may be claimed.
Taurine. No authorised claims. None have been granted.
This is why our product page says so little. It isn't restraint as a marketing posture. There is genuinely almost nothing we're permitted to assert, and the one thing we can assert is the least dramatic ingredient in the bottle.
How to read any European supplement label
Three habits that will save you money:
Look at the claim wording. If it reads awkwardly — "contributes to," "normal function of" — it's probably lifted from the register and therefore lawful. If it reads well — "boosts," "supercharges," "fights" — someone has decided the rules don't apply to them. That tells you something about the rest of the label.
Check which ingredient the claim attaches to. A product can carry a compliant vitamin C claim while its headline promise rests entirely on caffeine, which has no claim at all. The claim is doing legal cover, not describing the product.
Ignore percentages, read milligrams. NRV percentages are ratios against a reference figure, not a measure of usefulness. 700% sounds enormous. What it means is 560mg. Whether that number is good, bad or irrelevant is a separate question — and one we've written about honestly, including the part where a German federal institute suggests a lower figure than the one we use.
You can check any claim yourself. The European Commission maintains a public register of authorised, rejected and pending claims. If a sentence on a label isn't in it, it shouldn't be on the label.
More on this: vitamin C supplements, explained · energy supplements guide · how much caffeine is too much
Aurora Flow Energy Complex contains vitamin C 560mg (700% NRV), taurine 400mg, caffeine 180mg and guarana extract 60mg per daily dose of two capsules. 60 capsules, 30 doses. Made and shipped from Germany.
Vitamin C contributes to the reduction of tiredness and fatigue. Vitamin C contributes to normal energy-yielding metabolism.
Food supplements are not a substitute for a varied and balanced diet or a healthy lifestyle. Do not exceed the stated recommended daily dose. Keep out of reach of young children. Contains caffeine (180mg per daily dose) — not recommended for children or pregnant women. No health claims are authorised in the EU for caffeine, guarana or taurine.