Why UK supplement labels sound so cautious (and what that tells you)
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Because in Great Britain a supplement brand may only use health claims that appear as authorised on the Great Britain Nutrition and Health Claims register, and most claims about botanical and fungal ingredients aren't on it. That register is published by the Department of Health and Social Care and was last updated on 19 May 2026. If a claim isn't listed, it can't be used, whatever evidence a brand thinks it has.
Which is why a British product page reads like it's been through a solicitor, and an American one selling the same ingredient reads like a pitch. That difference is regulatory rather than scientific, and once you know how the rules work you can use them as a filter.
Key takeaways
• Only authorised claims may be used. CAP Code rule 15.1.1 permits only health claims listed as authorised on the applicable register, or claims that would have the same meaning to the consumer (Advertising Standards Authority).
• Wording flexibility is narrow. The ASA has ruled against adapted claims that dropped the word "normal", finding that "for strong bones" didn't carry the same meaning as the authorised claim about normal growth and development of bones.
• "Healthy" and "good for you" are regulated too. Rule 15.2 allows general, non-specific health references only when accompanied by a specific authorised health claim.
• "Antioxidant" is a health claim, not a description. The ASA has ruled against "antioxidant protection", "antioxidant repair" and "rich in antioxidants" where the wording wasn't authorised on the register.
• Brands may not imply your diet is failing you. CAP Code section 15 states that marketers must not claim or imply that a balanced or varied diet cannot provide appropriate quantities of nutrients in general.
• Claims left undecided at Brexit are stuck. Where the European Commission hadn't decided a claim application by 1 January 2021, a new application must be submitted to GB authorities for it to be authorised here (GOV.UK). That covers a great many botanical and fungal claims.
Contents
2. How the GB claims register works
3. The wording trap that catches most brands
4. Three rules people never see coming
5. The on-hold problem for mushrooms and botanicals
6. Where the medicines line sits
7. Novel foods, the other approval system
8. How to read a UK supplement label now
1. The short answer
Cautious language on a UK supplement label is usually a sign the brand read the rules.
Health claims in Great Britain operate on a permitted list. There's a register of authorised claims, and a brand may use those and nothing else. There's no route where a company reads a promising study, decides the evidence is good, and writes its own claim. The claim has to already exist on the register, and the product has to meet the conditions of use attached to it.
For most functional mushrooms and botanical ingredients, no authorised claim exists. So a compliant brand ends up describing what's in the product, what the research has looked at, and how it's tested, without promising an outcome. That reads as hedging. It's actually the law working as designed.
2. How the GB claims register works
Since 1 January 2021, Great Britain has run its own register rather than following the EU one. The GB Nutrition and Health Claims register lists both authorised and rejected claims, and only the authorised ones may be used in commercial communications here (GOV.UK).
The rules are mirrored in Section 15 of the CAP Code, which the Advertising Standards Authority enforces across UK advertising. Rule 15.1.1 permits only claims listed as authorised on the applicable register, or claims carrying the same meaning for the consumer. Rule 15.1 requires marketers to hold documentary evidence that their product meets the conditions of use attached to the claim, and to present claims clearly and without exaggeration.
An authorised claim looks like this: "[Nutrient] contributes to the normal function of the immune system." The ASA notes that claim is authorised for a number of substances including vitamins B12 and C, selenium and iron.
Notice the shape of it. A named nutrient, the word "contributes", and the word "normal". Every element is load-bearing.
3. The wording trap that catches most brands
Adapted wording is allowed, but only where it keeps the same meaning for the consumer. In practice that's a narrow gap, and the ASA has walked brands into it repeatedly.
Taking an authorised claim about "normal function" and rewriting it as "improved" or "increased" function is likely to be treated as exaggeration. In one ruling, a claim that a vitamin increased bone, heart and muscle health was found to go beyond the authorised claims about maintenance of normal bones, normal muscle function and normal immune function. In another, "for strong bones" was found not to carry the same meaning as the authorised claim about normal growth and development of bones.
The word "normal" does the heavy lifting in almost every authorised claim on the register. It's there because the claims describe a nutrient's role in keeping a healthy body working as it should, rather than improving on it. Delete it and you've changed the claim into something the register doesn't cover.
There's a related failure the ASA has flagged where an authorised claim was used with "contributes to" removed, leaving a bare assertion about reducing tiredness and fatigue. Same product, same vitamins, sufficient quantities present, and still a breach, because the wording overstated the authorised claim.
4. Three rules people never see coming
"Healthy" is a claim. Rule 15.2 covers general, non-specific references to overall good health or health-related wellbeing, phrases like "good for you" or "healthy". Those are permitted only when accompanied by a specific authorised health claim. A brand cannot simply call a product healthy and leave it there.
"Antioxidant" is a claim. The ASA treats it as a health claim requiring authorisation rather than a description. It has ruled against "antioxidant protection", "antioxidant repair" and "rich in antioxidants" where the wording wasn't authorised. This one is directly relevant to mushroom marketing, since antioxidant language is everywhere in the category, particularly around chaga.
Brands may not imply your diet is inadequate. CAP Code section 15 states that marketers must not claim or imply that a balanced or varied diet cannot provide appropriate quantities of nutrients in general. So the whole genre of supplement marketing built on telling you modern food is depleted and everyone is deficient runs against the Code, before you even reach the question of whether the underlying statistic is real.
That third one is worth holding onto as a reader. Any supplement page whose opening move is to tell you your diet is failing you has a compliance problem, whatever else it says.
5. The on-hold problem for mushrooms and botanicals
Here's the specific reason mushroom brands sound so hedged.
When the UK left the EU, a large number of claim applications for botanical ingredients were still sitting undecided at the European Commission. GOV.UK guidance is explicit about what happened next: all claims listed in the Community Register as at 1 January 2021 were adopted into the GB register, and where the Commission hadn't taken a decision on an application by that date, a new application must be submitted to the appropriate GB authorities for the claim to be authorised for the GB market.
Nobody has done that at scale for fungal ingredients. So the claims sit unresolved, which means a UK mushroom brand has essentially nothing on the register to point at.
This is the honest reason you won't find a British mushroom supplement telling you what it does. There is no authorised claim available to use.
6. Where the medicines line sits
Beyond claims law there's a second boundary, and crossing it is more serious.
MHRA Guidance Note 8 sets out how the agency decides whether something is a medicinal product. Two tests apply. The presentation test asks whether the product is presented as having properties for preventing or treating disease in humans. The mode-of-action test asks whether it's administered with a view to restoring, correcting or modifying physiological function by pharmacological, immunological or metabolic action.
Either test can catch a food supplement, and the assessment takes account of how the product is packaged, promoted and presented, including its name. A product sold lawfully as a food can become an unlicensed medicine through its marketing alone, without a single change to the formula.
The CAP Code covers the same ground from the advertising side: rule 15.6.2 makes claims that a food prevents, treats or cures human disease unacceptable in marketing communications, with the narrow exception of disease risk reduction claims already authorised on the register.
7. Novel foods, the other approval system
Claims law governs what a brand may say. Novel foods law governs what it may sell, and the two are often confused.
Under assimilated Regulation (EU) 2015/2283, a food is novel if it wasn't consumed to a significant degree in the EU or UK before 15 May 1997. Novel foods require authorisation before being placed on the GB market, and the Food Standards Agency maintains the register of what's permitted (FSA, novel foods authorisation guidance).
The FSA is also clear that responsibility sits with the business: an operator must know the identity of the ingredients in its product and their intended use, and the FSA only provides legal verification of novel status through the formal Article 4 consultation process rather than informal enquiries.
Status varies between species that a shopper would treat as interchangeable. A 2026 review in Nutrients notes that Cordyceps militaris is categorised as an unauthorised novel food under the European Commission and EFSA catalogue, while Ophiocordyceps sinensis, the species the name cordyceps traditionally refers to, was confirmed as not novel for food supplement use (NutraIngredients, August 2025).
Worth asking a brand which species it actually uses. It's a fair question and the answer should be on the label.
8. How to read a UK supplement label now
Five things you can now spot that most shoppers can't.
1. If a claim doesn't name a specific nutrient, be sceptical. Authorised claims attach to named substances at specified quantities.
2. Look for the word "normal". Its presence suggests someone worked from the register. Its absence, in a claim that otherwise sounds like a register claim, suggests someone edited one.
3. Treat "healthy", "wellness" and "antioxidant" as marketing rather than information. The first two are general claims needing a specific authorised claim alongside them, and the third needs authorisation in its own right.
4. Walk away from deficiency scare-setting. Implying a varied diet can't supply nutrients in general runs against the CAP Code.
5. A cautious label is a good sign. It usually means the brand checked.
I'd apply all five to us as well as to anyone else.
9. Common questions
Does a cautious label mean the product doesn't work?
No, and it doesn't mean it does either. Claims law regulates what may be said, not how well a product performs. A brand with a well-evidenced ingredient and a brand with a poorly evidenced one face the same restriction if no authorised claim exists for that ingredient. Which is why label language is a poor guide to efficacy and a decent guide to whether a company follows rules.
Why can an American website say things a British one can't?
Different legal systems. The GB regime works from a register of pre-authorised claims that a brand must draw from. Where a supplement market allows companies to make their own substantiated claims without pre-authorisation, the marketing reads very differently for the same ingredient. Neither difference tells you anything about the evidence.
Is it illegal for a UK brand to mention a study?
Describing what published research has investigated is different from making a health claim about your product, though the line is not always obvious and the presentation of the whole page matters. What a brand cannot do is cite research on an ingredient in a way that amounts to an unauthorised claim about the product, or imply a food prevents, treats or cures disease. Any brand near that line should be getting sign-off rather than guessing. We flag borderline copy for review before it publishes.
Who actually enforces this?
Several bodies, depending on where the claim appears. The ASA handles advertising and marketing communications under the CAP Code and actively monitors the supplement sector. Local authority trading standards handle labelling. The MHRA decides whether a product has crossed into medicines territory. The FSA administers novel foods. A brand can be compliant on labelling and still in breach on its own Instagram.
How do I check a claim myself?
The GB Nutrition and Health Claims register is published on GOV.UK and is free to search. It lists rejected claims as well as authorised ones, which makes it more useful than people expect. The ASA also publishes its advice pages and rulings online, and reading a handful of supplement rulings is the fastest education in this subject available.
Conclusion
The cautious language on a British supplement label is the visible result of a permitted-list system, and for mushrooms and botanicals the list is largely empty because the claim applications were left undecided at Brexit and never resubmitted here. Use that to your advantage: check claims against the GB register, treat "healthy" and "antioxidant" as regulated language rather than description, and be wary of any brand telling you your diet has failed you. A company that sounds careful is usually a company that checked. It's the standard we hold ourselves to as well.
Research references
1. Department of Health and Social Care. "Great Britain nutrition and health claims (NHC) register." GOV.UK, last updated 19 May 2026. Used for: the register lists all authorised and rejected nutrition and health claims, and only authorised claims may be used in Great Britain.
2. Department of Health and Social Care. "Nutrition and health claims: guidance to compliance with Regulation (EC) 1924/2006." GOV.UK. Used for: all claims in the Community Register as at 1 January 2021 were adopted into the GB register, and claims the European Commission had not decided by that date require a new application to GB authorities.
3. Advertising Standards Authority / Committee of Advertising Practice. "CAP Code Section 15: Food, food supplements and associated health or nutrition claims." asa.org.uk. Used for: rule 15.1 on documentary evidence and presentation without exaggeration; rule 15.1.1 on authorised claims and same-meaning wording; rule 15.2 on general health claims requiring an accompanying specific authorised claim; rule 15.6.2 on disease prevention, treatment and cure claims; and the requirement not to state or imply that a balanced or varied diet cannot provide appropriate quantities of nutrients in general.
4. Advertising Standards Authority / CAP. "Food: Health claims" advice page. asa.org.uk. Used for: adapted wording must carry the same meaning; rulings against replacing "normal function" with "improved" or "increased"; the "for strong bones" ruling on calcium; and the removal of "contributes to" from an authorised tiredness and fatigue claim.
5. Advertising Standards Authority / CAP. "Food: Antioxidant claims" advice page. asa.org.uk. Used for: "antioxidant" treated as a health claim requiring authorisation, and rulings against "antioxidant protection", "antioxidant repair" and "rich in antioxidants".
6. Advertising Standards Authority. "Food supplements, COVID-19 and the immune system." asa.org.uk. Used for: the authorised claim wording "[Nutrient] contributes to the normal function of the immune system", authorised for substances including vitamins B12 and C, selenium and iron, and the requirement to communicate the full meaning of an authorised claim.
7. Medicines and Healthcare products Regulatory Agency. "Guidance Note 8: A guide to what is a medicinal product." GOV.UK, 2026 version. Used for: the presentation test and the mode-of-action test, and the role of packaging, promotion and presentation in classification.
8. Food Standards Agency. "Novel foods authorisation guidance." food.gov.uk. Used for: the pre-15 May 1997 significant consumption test; assimilated Regulation (EU) 2015/2283; the requirement for authorisation before GB market placement; the FSA register; business responsibility for knowing ingredient identity and intended use; and legal verification of novel status only via the Article 4 consultation process.
9. Jędrejko M, Jędrejko K, Granda D, Kała K, Pokrywka A, Muszyńska B. "Current Evidence of Ergogenic and Post-Exercise Recovery Effects of Dietary Supplementation with Cordyceps militaris in Humans: A Narrative Review." Nutrients, 2026;18(5):781. Used for: Cordyceps militaris categorised as an unauthorised novel food under the European Commission and EFSA novel food catalogue.
10. NutraIngredients. "Cordyceps 'boom' on the horizon as novel food status of S. hepiali clarified." 29 August 2025. Used for: Ophiocordyceps sinensis confirmed as not novel, Cordyceps militaris remaining novel.
About the author
Kian is the founder of DoctorShrooms, the UK family wellness brand behind properly dosed functional mushroom gummies. Before this, he worked as an engineer on mass spectrometry instrumentation and later as a project manager in aerospace, before leaving to build a brand he felt the market was missing. He writes about functional mushrooms and family wellness, and is not a medical professional. Nothing he writes is medical advice, and nothing here is legal advice.
Disclaimer: This article is for general information and is not medical advice. Food supplements are not a substitute for a varied, balanced diet and healthy lifestyle. If you have a health condition, are pregnant or breastfeeding, or are giving supplements to a child, speak to your GP or pharmacist first.