Cosmetic Packaging Labelling Requirements UK: Labelling Rules Every Brand Must Know (2026)

UK cosmetic packaging must always carry five mandatory elements: product function, a full INCI ingredient list, the UK Responsible Person’s name and address, a batch code, and nominal content. On top of that baseline, SI 2026/23 adds three deadlines every UK cosmetic brand needs on the calendar: from 15 July 2026, the formaldehyde warning threshold drops from 0.05% to 0.001% and the UV filter 4-MBC is banned; from 15 August 2026, 16 newly classified CMR substances and the photoinitiator TPO are banned, alongside new Hexyl Salicylate concentration limits. Sell-through periods run to 15 January 2027 and 15 February 2027 respectively – after that, non-compliant stock has to come off shelves. Everything below covers what has to be on the label, exactly when, and how to build packaging that doesn’t need a full redesign the next time a threshold moves.

Non-compliant labelling is one of the most common reasons UK cosmetic products get pulled from retail shelves – and most brands don’t find out until stock is already sitting in a warehouse they can’t ship from. 2026 raises the stakes: SI 2026/23 (The Cosmetic Products Regulation (EC) No 1223/2009 (Restriction of Chemical Substances) (Amendment and Transitional Provisions) Regulations 2026) adds real deadlines on top of the labelling rules brands are already used to, and getting the label right now means designing for rules that didn’t exist twelve months ago.

What Must Appear on Every UK Cosmetic Label

What information is legally required on Cosmetic packaging labelling requirements in the UK? Every UK cosmetic label needs five mandatory elements: the product’s function, a full ingredient list in INCI format, the name and address of the UK Responsible Person, a batch or lot code, and the nominal content by weight or volume. Beyond that baseline, specific formulations trigger additional requirements – use precautions, allergen declarations, or substance-specific warnings like the formaldehyde rule below. None of these is optional; missing any one of them is enough to flag a product as non-compliant at the border or on shelf.

• English language – mandatory information must appear in English
• PAO symbol – required if shelf life exceeds 30 months
• Durability date – a “best used by” date if shelf life is under 30 months (not both – see the FAQ below)
• Precautions for use – handling warnings printed on the label itself, not left to a leaflet where avoidable
• Legibility – text must stay indelible and readable, not fade or rub off in normal handling

Do I need both a best-before date and a PAO symbol on cosmetic packaging? No – only one, and it’s decided by actual shelf-life data, not chosen as a safety margin. A PAO symbol (the open-jar icon showing months, e.g. “12M”) is required if the product’s shelf life exceeds 30 months. If shelf life is under 30 months, a “best used by” date is required instead. Including both contradicts the rule rather than reinforcing it.

The UK Responsible Person, Explained

Every cosmetic product sold in Great Britain needs a named Responsible Person with a UK address on the packaging – the entity that holds the product safety file and answers to regulators if something goes wrong. For UK-based brands, that’s the company itself. For overseas brands selling into the UK, it means appointing a third-party Responsible Person service or a UK-based distributor willing to take on the role, before a single unit reaches a shelf. Skipping this step is one of the fastest ways a shipment gets stopped at import.

What does a UK cosmetic Responsible Person actually do? Beyond holding a UK address, the Responsible Person keeps the Product Information File (PIF), verifies the Cosmetic Product Safety Report (CPSR), and submits the product through the UK’s SCPN (Submit Cosmetic Product Notification) portal before it can legally enter the market. Regulators contact this person directly during any safety query – not the manufacturer, and not the brand’s overseas head office.

How do overseas brands appoint a UK Responsible Person? Brands based outside the UK typically work with a third-party Responsible Person service, which takes on the regulatory role for a service fee, or partner with a UK-based distributor willing to assume it. Either arrangement needs to be confirmed and verified before the first shipment clears customs – trying to sort this out after goods are already in transit is how shipments end up held.

What happens if a product has no valid Responsible Person declaration? Products without a proper Responsible Person declaration are treated as non-compliant at the UK border, which typically means customs holds, shipment rejection, or removal from retail listings if the product has already reached shelves. Trading Standards can also take enforcement action against the seller directly, independent of any border issue.

INCI Ingredient Listing Rules

Ingredients must be listed in descending order of concentration down to 1%; below that threshold, any order is permitted. Names must use standardised INCI (International Nomenclature of Cosmetic Ingredients) terms – no brand-specific or marketing names.

• INCI format – standardised names only
• Descending order – required down to 1% concentration
• Below 1% – any order permitted
• “Parfum”/”aroma” grouping – allowed for fragrance blends as a whole
• Named allergens – specific fragrance allergens above threshold concentrations must still be named individually, even inside a “parfum” blend, and the list of allergens requiring individual naming has been growing

Does Packaging Size Change What’s Required?

Small packaging – tubes, bottles, compacts – can move some required information to an accompanying leaflet, tag, or insert rather than fitting everything on the primary pack. That exemption is getting harder to rely on in 2026: with more warning text now required (the formaldehyde warning being the clearest example), the same small pack that used to fit everything on-label may no longer have room. In practice, this is pushing more brands toward multi-layer or peel-back label formats out of necessity, not preference.

Can small cosmetic packaging skip some labelling requirements? Small packs can move certain information to a leaflet, tag, or peel-back label rather than the primary pack, provided the pack itself carries the “refer to enclosed information” open-book symbol pointing to it. This exemption is shrinking in 2026 as new mandatory warnings (like the lowered formaldehyde threshold) take up label space that was previously available for other content.

What Changed for 2026: SI 2026/23, Explained With Dates

What is SI 2026/23 and what does it change for cosmetic labelling? SI 2026/23 –The Cosmetic Products Regulation (EC) No 1223/2009 (Restriction of Chemical Substances) (Amendment and Transitional Provisions) Regulations 2026 – is the statutory instrument behind all three 2026 changes: a much lower formaldehyde warning threshold, a full ban on the UV filter 4-MBC, and a ban on 16 newly classified CMR substances plus the photoinitiator TPO. It brings Great Britain’s rules closer in line with the EU’s evolving hazard-based approach to cosmetic ingredient regulation. Source: Labelservice’s regulatory summary and Cosmeservice’s SI 2026/23 breakdown.

From 15 July 2026:

• Products containing preservatives listed in Annex V must carry a “releases formaldehyde” warning once the finished product’s formaldehyde release exceeds 0.001% – down sharply from the previous 0.05% threshold. The wording itself changes too, from products that “contain” formaldehyde to those that “release” it, which affects how brands need to test and document formulations.
• The UV filter 4-Methylbenzylidene Camphor (4-MBC) is banned outright from newly placed products.
• Products already on the market before this date can continue to be sold until 15 January 2027.

From 15 August 2026:

• 16 newly classified CMR substances (carcinogenic, mutagenic, or reprotoxic) are prohibited – spanning organotin compounds, certain photoinitiators, industrial intermediates, and specific carbon nanotubes.
• TPO (a photoinitiator used in some nail and gel products) is also banned from this date.
• Hexyl Salicylate picks up new maximum concentration limits, varying by product category and whether the product is intended for children under three.
• Sell-through for existing stock runs to 15 February 2027.

Source: Professional Beauty’s regulatory summary, CIRS Group, and UL Solutions.

Do I need to pull existing stock immediately once these 2026 rules take effect? No – not immediately. Products already placed on the market before the relevant date can continue to be sold during the transitional period: to 15 January 2027 for the formaldehyde and 4-MBC changes, and to 15 February 2027 for the CMR substance and TPO bans. New products placed on the market from the effective dates, though, must comply from day one – there’s no grace period for anything newly launched.

Non-Compliance Penalties and What Triggers a Recall

A non-compliant product can be stopped at import, pulled from retail listings, or forced into a full recall – and the trigger is often something as small as a missing warning line, not a formulation problem. Retailers increasingly run their own compliance checks before listing a product, which means non-compliant labelling can cost a brand a retail relationship before regulators are even involved. In practice, the commercial cost usually lands faster than the regulatory one.

Quick Reference: 2026 UK Cosmetic Labelling Checklist

Staying Compliant as the Rules Keep Moving

The practical fix isn’t reacting to each new statutory instrument as it lands – it’s specifying packaging with enough label space and structural flexibility to absorb new warnings without a full redesign. That’s increasingly a packaging engineering question as much as a regulatory one. Brands working with a supplier that tracks these changes and can adjust label layout, add extended-content formats, or resize print area without disrupting a live product line spend far less time reacting to deadlines they didn’t see coming.

Hale Path Packaging builds that flexibility into cosmetic packaging from the first draft – enough surface area for evolving warning requirements, formats that support peel-back or multi-layer labelling where a pack is too small for everything on the primary panel, and a design process that treats the Responsible Person’s label requirements as part of the spec, not an afterthought.

The Bottom Line

Cosmetic packaging labelling requirements UK in 2026 isn’t a one-time checklist – SI 2026/23 alone moves three separate thresholds inside a single year, and further amendments are likely as UK rules continue converging with the EU’s hazard-based approach. Brands that treat label space as fixed infrastructure end up redesigning packaging every time OPSS issues a new statutory instrument. Brands that build in flexibility from the start – enough surface area, adaptable formats, a Responsible Person relationship that’s actually tracking these changes – spend far less time reacting to deadlines they didn’t see coming.

Talk to Hale Path Packaging about building compliance flexibility into your next cosmetic packaging run – before the next statutory instrument lands, not after.

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