Hair loss is a crowded advertising category, from shampoos and supplements to clinics and online prescribers. This article explains what the UK’s Advertising Standards Authority (ASA) and the Committee of Advertising Practice (CAP) say about it, as set out in a CAP News article dated 9 July 2026 and the ASA’s hair loss advice page. It describes UK rules only; the United States, the EU and other markets have their own systems.
Which types of hair loss do the ASA and CAP distinguish?
According to the ASA and CAP, there are three main types, and an ad should be clear about which one it is talking about:
- Alopecia areata: patchy, often unpredictable hair loss.
- Chronic telogen effluvium (shedding): a temporary imbalance in the hair growth cycle.
- Androgenetic alopecia (pattern baldness): the most common form, with gradual thinning in recognisable patterns.
The ASA’s 9 July 2026 article says ads must not imply that a product works across all forms of hair loss. On shedding specifically, the ASA’s guidance states that neither the ASA nor CAP has seen evidence that any product can treat or help with it. That is a statement about the evidence the regulator has seen to date, not a medical conclusion, and the guidance can change.
What separates a medicinal claim from a cosmetic one?
The dividing line is whether a claim touches a physiological function. The ASA’s advice says hair growth, or the lack of it, is a physiological function, so claims to prevent or cure baldness are likely to be treated as medicinal. Claims to slow or reduce hair loss, or to promote existing growth, are unlikely to be medicinal.
| Type of wording | How the guidance treats it | What it requires |
|---|---|---|
| Prevent, cure or reverse hair loss | Likely medicinal | Marketing authorisation from the MHRA, and claims within its conditions |
| Reduces hair loss, strengthens hair, stimulates growth | Likely non-medicinal | Robust evidence for the claim |
| Temporary cosmetic effect (wigs, fibres) | Cosmetic | Wording must not suggest a treatment for hair loss |
For marketers wanting to claim prevention or cure, the guidance says to check with the MHRA, the UK medicines regulator, in the first instance. Where a product already holds an authorisation, claims must not go beyond the licence. This is a UK framework; a product that is licensed in another country is not automatically licensed here.
Can prescription hair loss treatments be advertised to the public?
No. According to the ASA, prescription-only medicines (POMs) must not be advertised to the public. The hair loss advice page names prescription-strength finasteride and minoxidil and cites CAP Code rule 12.12.
The July 2026 article adds practical points for businesses that offer these treatments:
- Named POMs should be kept off a website’s homepage, with other information balanced, factual and non-promotional.
- Compounded or unlicensed medicines must not be advertised, and ads must not suggest that consumers can choose or obtain prescription treatments directly.
- A clinic may advertise a “hair loss consultation”, but not the treatment itself, for example a “consultation for finasteride”.
The guidance points to a 2023 ruling on Hims & Hers UK Ltd, in which featuring finasteride images and references on a hair loss website was found to breach rule 12.12. Clinic-based services in other areas of beauty face their own prescription-medicine rules, covered in the piece on cosmetic injectables and treatments.
Why do celebrities and creators come up?
The ASA says celebrities must not be used to promote prescription-only or over-the-counter medicines, including treatments such as minoxidil, citing CAP rule 12.18. The rule is framed around the product category. This publication’s reading, not a quoted ASA statement, is that anyone weighing a sponsored post about a medicine would need to start with the product’s legal status.
Separately, paid content must be identifiable as advertising. For the labelling basics, see the explainer on how the ASA handles complaints about influencer ads.
How much evidence does a shampoo or supplement claim need?
Objective claims need robust evidence. The ASA’s 9 July 2026 article lists weaknesses it commonly sees:
- Reliance on study abstracts or summaries rather than full studies.
- Studies not directly related to the product’s formulation.
- Small, unrepresentative samples.
- No control group or objective measurement.
- Overreliance on subjective consumer surveys.
The ASA says it assesses overall quality and relevance, not just the number of studies. The hair loss advice page recalls rulings on Hairburst, Alpecin and Brand Evangelists in which the evidence was found insufficient for similar reasons, including small samples, no control groups and subjective surveys.
For supplements, the July 2026 article says a health claim should only be made if it is authorised and listed on the Great Britain nutrition and health claims register, with the conditions of use met. The advice page cites rule 15.1.1 for food supplements. General claims about improving hair growth or thickness are often not permitted unless explicitly supported.
Are testimonials and before-and-after photos enough?
Not on their own. The ASA states that testimonials do not replace clinical evidence, and that every efficacy claim still needs substantiation. On images, the July 2026 article says: “Before and after images must reflect genuine, typical outcomes and must not exaggerate results.” The advice page similarly says marketers should ensure such photos accurately reflect the results of the product or service used.
Edited images are a separate risk. The ASA’s views on retouching and filters, and why a small disclaimer is unlikely to fix an exaggerated visual, are covered in the article on beauty filters in cosmetics ads. Lighting, styling or hair fibres applied for a photograph could raise comparable questions for a hair loss ad, though that is the article’s inference rather than a stated ASA position.
What about fibres, wigs, guarantees and “as seen on TV”?
The advice page covers several smaller points:
- Wigs and fibres: products offering a cosmetic or temporary result should not be described in a way that confuses readers into thinking they treat hair loss. The July 2026 article says claims that go beyond a temporary solution, for instance to “solve” thinning hair, are likely to draw scrutiny.
- Money-back guarantees: these are not prohibited, but an ad must not imply guaranteed results by offering one. The guidance points to a 2024 ruling on Regaine as an example of how a refund tied to treatment performance can imply proven effects.
- “As seen on TV”: marketers using the line should hold evidence that the product featured on a recent TV programme.
- Combined treatments: where a treatment includes non-prescription minoxidil, it must not imply the whole treatment is proven if it is not.
How does this compare with other beauty claims?
Hair loss sits between cosmetics and medicines, which is why the rules are stricter than for most beauty advertising. Environmental or sustainability wording on the same products is governed by a different regime, explained in the article on green claims in fashion and beauty. In both cases the common thread is that a claim must be backed by evidence held before it is made.
A category where the product’s legal status comes first
The ASA and CAP guidance, as of the 9 July 2026 article, makes a few points consistently. Say which kind of hair loss is meant. Treat prevent, cure and reverse language as medicinal. Do not advertise prescription medicines to the public. Back every other claim with robust evidence, and keep before-and-after images typical. Anyone reading a hair loss ad in the UK can use the same points as a reference for what the regulator expects.
This article is general information based on published ASA and CAP guidance, not legal, medical or regulatory advice. Rules, guidance and platform policies change, and it describes the UK system only.
Sources: Advertising Standards Authority (Keep your ads a cut above the rest: Advertising products and services for hair loss); Advertising Standards Authority (Hair: Hair loss)
