What Is a Nootropic? The Word, the Law, and What a UK Label May Actually Say

July 29, 2026|Barry Lees

If you have shopped for a brain supplement recently you will have met the word nootropic several dozen times and been told what it means precisely never. That is not an accident. It is one of the few words in the supplement aisle that a brand can use without having to stand behind anything.

I sell one of these products. This guide is the explanation I would want before spending £30 on one.

Where the word came from

It was coined in 1972 by a Romanian chemist, Corneliu Giurgea, from the Greek noos (mind) and tropein (to turn). He was describing a specific compound he had helped synthesise, and he set out criteria for what should qualify — among them that the substance should be extremely low in toxicity and should not act as a conventional stimulant or sedative.

Two things followed. The first is that the word was invented to describe pharmaceuticals, not foods. The second is that almost nothing now sold as a nootropic would meet Giurgea's original criteria, not least because a great many of them are, straightforwardly, stimulants.

What it means in GB law: nothing at all

There is no legal definition of a nootropic in Great Britain. No minimum dose, no required ingredient, no test, no register. Any food supplement may be marketed as one. A pot containing nothing but caffeine and a pinch of green tea can carry the word legitimately, because there is no standard for it to fall short of.

This is worth internalising before you compare products, because it means the category name carries no information. Everything useful is further down the label.

What does have legal force

Since 1 January 2021, the only claims a UK supplement may make about what an ingredient does are those on the GB nutrition and health claims register. The register carries specific approved wording, and three rules govern how it is used.

1. The claim belongs to the nutrient, not the product

"Our formula supports memory" is not permitted. "Zinc contributes to normal cognitive function" is. It sounds like a technicality and it isn't: the first is the product claiming an effect, the second is a statement about a nutrient that has been assessed. Once you notice the difference you cannot stop seeing it, and it sorts the market fairly quickly.

2. The nutrient must be there in a meaningful amount

A nutrient carries its claim only if a serving provides at least 15% of the Nutrient Reference Value. Below that threshold it may be listed on the label but nothing may be said about it. This is why the %NRV column matters more than the ingredient count — a formula listing fourteen vitamins with four above 15% is selling you a list.

3. Some claims carry conditions

A few are only permitted at a stated intake. The one that matters most in this category: DHA contributes to the maintenance of normal brain function requires 250mg of DHA per day — DHA alone, not 250mg of EPA and DHA together, which is a different claim about the heart. Plenty of brain formulas contain some DHA. Very few contain enough to say anything about it, ours included.

The claims that exist for this category

The full permitted vocabulary for a brain supplement is smaller than most people expect:

Normal cognitive function — zinc, iodine, iron
Normal mental performance — pantothenic acid (B5)
Normal psychological function — niacin, B6, B12, folate, biotin, magnesium, vitamin C, thiamin
Normal functioning of the nervous system — niacin, B12, B6, iodine, biotin, copper, magnesium, thiamin, vitamin C
Reduction of tiredness and fatigue — B12, folate, niacin, pantothenic acid, riboflavin, B6, vitamin C, magnesium, iron
Maintenance of normal brain function — DHA, at 250mg a day

That is the list. If a UK brain supplement is telling you something outside it, it is going beyond what the register allows.

The awkward part: the famous ingredients aren't on it

Bacopa, ginkgo, panax ginseng, rhodiola, lion's mane, citicoline, L-theanine — none has an authorised health claim in Great Britain.

The reason is more procedural than damning. When the register was assembled, roughly two thousand botanical claims were still awaiting assessment, and rather than approve or reject them they were parked as "on hold". They have stayed there. After EU exit that holding position carried into GB law, and it is expected to remain unresolved at least until the GB and EU registers are brought back into alignment.

So the honest description is: not approved, not rejected, in limbo. Some brands use on-hold wording on that basis. We have chosen not to, for two reasons. "On hold" is not "authorised" — and botanical claims are one of the most common things flagged in UK compliance reviews, so a page built on them is built on sand.

And the caffeine claim that never happened

This one is worth knowing because it is repeated everywhere, including by people who should know better.

EFSA issued positive scientific opinions on caffeine for alertness and for concentration. Those opinions are real and they are frequently cited as though the matter were settled. But the European Parliament vetoed the regulation that would have authorised the claims, so they were never adopted — and that position carried across into GB law.

The result is that no supplement sold in the UK may tell you its caffeine improves your focus, however much caffeine it contains. An EFSA opinion is not an authorisation. When you see "EFSA-approved" on a supplement page, treat it as a signal about the seller rather than the product.

Reading a label once you know all this

Four things to look at, in order:

The serving size. One capsule or two? Everything else — cost per day, how long the pot lasts, whether a nutrient clears 15% NRV — depends on it.
The %NRV column. Which nutrients are above 15%? Those are the only ones that can carry a claim, and between them they are the entire legally-supported case for the product.
Whether every ingredient has its own weight. A blend total is a way of not telling you.
The wording. Nutrient-attributed and register-shaped, or product-level promises? That single test tells you more about a brand than its reviews do.

None of this means a botanical is worthless. It means the seller may not tell you what it does, so you have to decide for yourself — and you can only do that if the label tells you the species, the part used, the weight and the extract ratio. Which is the real reason to care about all of the above.