Health claims explained

In Great Britain a supplement may only make a health claim that appears on the official nutrition and health claims register, and may never claim to prevent, treat or cure a disease.

By the Supplements UK editorial team. Last checked 9 October 2026. General information, not medical advice.

Short answer In Great Britain a supplement may only make a health claim that appears on the official nutrition and health claims register, and may never claim to prevent, treat or cure a disease. That is why labels say 'contributes to the normal function of'.

How it works

Each authorised claim links a specific nutrient, at a stated amount, to a specific normal body function. 'Vitamin C contributes to the normal function of the immune system' is authorised. 'Boosts immunity' is not.

What has no authorised claims

Collagen, probiotics, most herbal extracts, and ingredients such as astaxanthin. Products containing them usually borrow a claim from an added vitamin or mineral.

How to read a pack

Find the claim, find the nutrient it belongs to, and check the product contains a meaningful amount of that nutrient. Everything else on the front is marketing.

How this site uses claims

We quote authorised claims as they are worded, describe trial evidence as evidence, and say so where there is none.

Keep exploring

Questions people ask

Can supplements claim to cure anything?

No. Claims to prevent, treat or cure disease are prohibited for foods.

Can I take this with medication?

Ask a pharmacist or GP first; some supplements interact with medicines.

Do supplements replace a balanced diet?

No. They are meant to add to a varied diet, not stand in for one.

Sources

Checked 9 October 2026.