Supplement marketing in the UK: how to grow a brand inside the claims rules

How does supplement marketing work in the UK?

Supplement marketing in the UK works when every health claim matches an authorised claim on the GB Nutrition and Health Claims register and every ad clears Meta and Google health policies. Growth then comes from repeat orders, not first purchases: brands that scale sell a daily routine and visible proof of quality, then use retention to turn one pack into a habit.

This is a summary for founders and heads of ecommerce, not legal advice. Food supplements sit under section 15 of the CAP Code, the same section that governs food advertising, and the Advertising Standards Authority applies it to paid social, search ads, email and the claims on your own website. Wording that breaks the rules gets ads withdrawn; compliant wording can run on every channel.

Which health claims can a UK supplement brand make?

The GB Nutrition and Health Claims register is the list that matters. The register is published by the Department of Health and Social Care on GOV.UK and records claim applications for Great Britain, authorised and non-authorised. CAP Code rule 15.1.1 allows only claims listed as authorised, or claims with the same meaning to the consumer. Claims that a food prevents, treats or cures human disease are banned outright (rule 15.6.2), apart from the small number of authorised disease risk reduction claims.

Each authorised claim carries conditions of use. The vitamin C immune claim, for example, may only be used on a product that is at least a source of vitamin C, and rule 15.1 requires documentary evidence that your product meets that condition. The claim must also refer to the nutrient, not your product name. Wording can move a little: the ASA guidance on health claims notes that "to support" has been accepted in place of "contributes to", while "boosts energy" was ruled not to mean the same as "contributes to normal energy-yielding metabolism".

What about "good for you" claims and botanical ingredients?

The rule on general claims catches many brands out. Words such as "healthy" or "good for you" are general, non-specific health claims. Under CAP rule 15.2 they are only acceptable when they sit alongside a specific authorised claim that explains the benefit. Rule 15.8 adds that you must not state or imply that a balanced diet cannot provide enough nutrients, which rules out a whole genre of "you can't get this from food" copy.

Botanical ingredients are the grey area. Botanical claims were left for later when the authorised list was first built, and many now sit on an "on hold" list. GOV.UK guidance says on-hold claims may still be used in line with a 2014 Department of Health bulletin until a decision is made. The ASA advises marketers to seek DHSC advice before using them, and has ruled against ads where the advertiser could not show the claim was on hold, or could not evidence it.

How do you turn the claim you want into one you can make?

The quickest way to brief a copywriter is to start from the claim the founder wants, then find the nearest authorised wording. The examples below are generic and drawn from the register as published on GOV.UK. Treat them as a starting point for your own check, not as approved copy for your product.

Check each line against the live register before it ships. The register is updated, and the conditions of use decide which claims each product in your range can carry.

What do Meta and Google allow in supplement ads?

The ad platforms apply their own policies on top of UK law, and approval by a platform says nothing about ASA compliance. For supplement advertising the rules that bite most often are these:

• Age targeting on Meta: the Health and Wellness policy requires ads for dietary and health supplements to target people aged 18 or over.
• Weight and appearance: Meta bans statements of inferiority about appearance and close-ups pinching fat in weight loss or weight gain ads.
• Personal attributes: Meta's personal attributes policy stops copy that asserts or implies the viewer has a health condition, so hooks like "Do you struggle with..." risk rejection.
• Google Ads: the healthcare and medicines policy restricts supplements with active pharmaceutical or dangerous ingredients, items on its unapproved substances list, and products implied to prevent, cure or treat disease.
• The stricter rule wins: a Meta before-and-after that the platform allows can still breach the CAP Code if it implies an unauthorised effect.

What creative sells supplements without medical claims?

The creative that works for supplement brands rarely leans on the claim at all. Customers buy a routine they can picture and a brand they trust, and the authorised claim sits underneath as the reason to believe. For supplement brands, the angles that tend to hold up are the ones with no health promise in the hook.

• Routine: where the product sits in the morning, the gym bag or the desk drawer, shot as the customer would use it.
• Taste and format: gummies, powders, sachets and capsules solve different problems, so show the format.
• Ingredients and dose: name the form and the amount per serving, which signals quality without a claim.
• Testing and sourcing: batch testing, certificates and where ingredients come from.
• Founder story: why the brand exists, told plainly, with no promise of results.
• Reviews within the rules: testimonials must be genuine, you must hold the reviewer's contact details (rule 3.47), incentivised reviews must be labelled as such (rule 3.45), and the ASA says claims in testimonials are judged like any other claim.

The same applies to creators. The ASA has upheld complaints about influencer posts making unauthorised claims, and rule 15.6.3 stops health claims that refer to an individual health professional's recommendation.

Why is retention the profit engine for a supplement brand?

In the supplement accounts we review, the first order from paid social often fails to pay for itself once product and ad costs are counted. Supplement economics work because the product runs out. A 30-day pack creates a natural reorder date, and the brands that grow build their whole retention programme around that date rather than around a generic weekly newsletter.

In practice that means a subscription with a clear skip and pause option, replenishment reminders timed a few days before the pack runs out, and post-purchase emails that teach the customer how and when to take the product so the habit forms. We cover the build in Klaviyo flows for Shopify brands. Email and SMS copy sit under the same claims rules as ads, so the authorised wording carries through. Judge paid media against the value of a subscriber over time, not the first basket: our guide to customer lifetime value sets out how to calculate it.

What does a supplement website need to earn trust?

The product page does the work that a claim cannot. A shopper who cannot be promised an outcome looks for evidence that the product is what it says it is, and the site should answer that before they ask. Remember that the CAP Code covers claims on your own website too, so product pages need the same discipline as ads.

• Lab testing: publish batch test results or certificates of analysis where customers can find them.
• Ingredient pages: one page per key ingredient, with the form used, the dose per serving and the authorised claim tied to that nutrient.
• A proper FAQ: how to take it, what it tastes like, who it is not suitable for, and how the subscription works.
• Subscription terms up front: price per delivery, frequency and how to cancel, stated on the product page rather than hidden at checkout.

If the ASA finds non-compliant claims on a brand's own site, it can list the company on its website and ask search engines to remove paid search ads that link to the offending page, as set out on its sanctions page.

Where RedPxl fits

Supplement brands are part of our core client focus. We run paid media, Shopify builds, Klaviyo retention and creative in one team of 19 specialists in Canary Wharf, with one named specialist on each account and every budget change explained in writing. If you are comparing partners, our guide on how to choose an ecommerce agency sets out the questions to ask. When you are ready, tell us what you are working with.