UK Supplement Regulations & EFSA Health Claims: What to Trust

By Jordan Harvey · 29 July 2026 · Updated 29 July 2026 · 8 min read

Walk down any supplement aisle, online or in a shop, and you will see two very different kinds of language. Some products say something precise and dull, such as “contributes to normal function of the immune system”. Others shout that they “supercharge”, “detox” or “cure”. The difference is not marketing flair — it is the law. In the UK, what a food supplement brand can print on a label is tightly controlled, and most of the bold promises you see are not permitted. This guide explains the rules in plain English: who sets them, what an EFSA health claim is, what a brand may and may not say, and how to read a label so you can tell an honest product from a salesy one.

Who Actually Regulates UK Supplements?

A food supplement is, legally, a food — not a medicine. That single fact decides almost everything about how it is regulated. Supplements are concentrated sources of nutrients (such as vitamins, minerals or plant extracts) sold in measured doses like tablets or capsules, and they sit under food law, overseen in Great Britain by the Food Standards Agency (FSA) and enforced locally by Trading Standards.

The core rulebook is the Food Supplements (England) Regulations 2003 (with matching versions for Scotland, Wales and Northern Ireland). These set out what counts as a food supplement, which vitamin and mineral sources are permitted, and what mandatory information the label must carry — the name, the recommended daily amount, a warning not to exceed it, and a statement that supplements do not replace a varied diet. Separately, a second rulebook governs what a brand is allowed to say about benefits, and that is where EFSA comes in.

What Is an EFSA Health Claim?

A health claim is any statement that links a food or nutrient to your health — for example, that a vitamin supports a normal body function. Under the retained EU Regulation 1924/2006 on nutrition and health claims, a brand cannot simply invent such a statement. The claim must first have been assessed for scientific evidence by the European Food Safety Authority (EFSA), the independent scientific body that reviewed thousands of proposed claims, and then approved for use.

Approved claims are published on a public list. In Great Britain this is the GB Nutrition and Health Claims (NHC) Register, maintained by the FSA. If a claim is on that register, a brand may use it — but only in the authorised wording (or a form that means exactly the same thing). If a claim is not on the register, it cannot be used at all. The body that advised on this framework, the Nutrition and Health Claims Committee (NHCC), sits within this same evidence-led system.

What a Brand CAN Say

Authorised claims read in a recognisable pattern: a named nutrient, a careful verb, and a normal body function. Here are three genuine examples from the register, each one a complete authorised claim in its own right.

Vitamin C contributes to the normal function of the immune system.

Vitamin C contributes to the reduction of tiredness and fatigue.

Zinc contributes to the maintenance of normal testosterone levels in the blood.

Notice what these have in common. Each names a specific nutrient. Each uses “contributes to” rather than “boosts” or “cures”. And each refers to a normal function — keeping a healthy system working as it should — not a promise to enhance, increase or fix anything. A brand may use a claim like this only if the product contains a meaningful amount of the nutrient (a “significant amount” defined in the rules), so a token sprinkle of vitamin C does not earn the immune-system claim.

What a Brand CANNOT Say

The flip side is a long list of statements that are simply not allowed, however common they are in advertising. The two big categories are unauthorised health claims and medicinal claims.

The crucial boundary is the one with medicine. Under the Medicines and Healthcare products Regulatory Agency (MHRA), the moment a product claims to diagnose, treat, cure or prevent a disease, it is being presented as a medicine — and a medicine needs a licence the supplement does not have. So a brand may not say a supplement “cures” anything, “treats” a condition, or replaces a prescribed drug. This is also why honest brands keep a clear disclaimer that the product is a food supplement, not a medicine.

The Herbal Exception: Why Botanicals Carry No Claim

Here is the part that confuses most shoppers. If the rules are evidence-led, why do popular herbs like ginseng, maca or tongkat ali carry no health claim at all? The answer is the “on-hold” status of botanical claims.

When EFSA worked through the thousands of submitted claims, it assessed nutrient claims (vitamins and minerals) relatively quickly, because the science was clearer. A large batch of botanical (herbal) claims was set aside — placed “on hold” — while questions about evidence and traditional-use assessment were resolved. Many of those claims remain unresolved to this day. The practical result: for most herbs there is no authorised claim, so a compliant brand cannot state a herbal benefit as a product claim, even where some research exists. You can read more about this in our guides to whether do herbal supplements work and our broader overview of herbal supplements for men.

How to Read a Supplement Label

A compliant UK supplement label carries a predictable set of information. Knowing what to look for tells you a great deal about how seriously a brand takes the rules.

The quickest mental shortcut: read the benefit statements, then check whether they name a nutrient and a normal function in cautious language. If a product instead promises to fix, cure or supercharge something, treat that as a warning sign rather than a feature. For the bigger picture on safety and quality, see our guide to whether are men’s supplements safe.

Why These Rules Protect You

It is easy to read all this as red tape, but the framework exists for a simple reason: it stops companies selling hope as fact. Before the claims rules, a brand could print almost any benefit it liked. Now, a health claim has to survive independent scientific review before it can appear on a single bottle. That shifts the burden of proof from the shopper to the manufacturer.

The system is not perfect — the “on-hold” botanical situation leaves genuine grey areas, and enforcement relies partly on Trading Standards capacity. But the principle is sound and it works in your favour. When you understand the rules, the marketing loses its power: you can read a label, separate the authorised claims from the noise, and judge a product on what it actually contains rather than how loudly it is sold.

Frequently Asked Questions About UK Supplement Rules

The Bottom Line

UK supplement regulation is not glamorous, but it is on your side. A brand can only state a health benefit if it matches an authorised claim on the GB Register, in cautious approved wording, and only for nutrients present in a meaningful amount. Herbs mostly carry no claim at all because their assessments remain “on hold”, and any product that claims to cure or treat a disease has stepped over the line into unlicensed medicine.

Once you know the pattern — named nutrient, cautious verb, normal function — the marketing noise becomes easy to filter. Read the small print, check the doses, and judge a product on what it contains and what it is legally allowed to say. If a label is honest about its claims and clear about its doses, that transparency tells you more than any headline ever could.