How Are Skincare Products Safety Assessed in the UK?
Pure Tone Journal · Clinical Evidence
How Are Skincare Products Safety Assessed in the UK?
Before a cosmetic product reaches your bathroom shelf, its finished formulation must be assessed for safety.
Here we explain what a Cosmetic Product Safety Report is, what a qualified safety assessor actually reviews, why microbiological challenge testing and stability testing matter, and how these standards apply to Pure Tone Aesthetics skincare.
The short version
Does Skincare Have to Be Safety Assessed in the UK?
Yes. Cosmetic products made available to consumers in Great Britain must be assessed for safety before they are placed on the market.
A suitably qualified professional reviews the cosmetic product and prepares a Cosmetic Product Safety Report, usually referred to as a CPSR.
This assessment looks beyond the marketing claims or the ingredient list. It considers the complete formulation, the concentrations of individual ingredients, how the product is intended to be used, consumer exposure, microbiological quality, stability and other relevant safety information.
The CPSR then forms part of the product's wider Product Information File, or PIF.
Safety Assessment Is About the Finished Product
An ingredient may have a long history of cosmetic use, but that does not remove the need to assess the complete finished formulation.
The concentrations used, the type of product, whether it is rinsed away or left on the skin and the level of expected consumer exposure all contribute to the final safety assessment.
Cosmetic regulation in Great Britain
What Does UK Cosmetic Regulation Require?
Cosmetic products available to consumers in Great Britain must be safe for human health when used under normal or reasonably foreseeable conditions.
The Responsible Person for a cosmetic product must make sure the appropriate regulatory requirements have been met before the product is made available to consumers.
This includes maintaining a Product Information File containing the relevant documentation for that product.
The PIF includes the product's Cosmetic Product Safety Report, information relating to manufacture and good manufacturing practice, evidence supporting relevant cosmetic claims and other required product information.
The UK Government's guidance specifically states that a cosmetic product must have its safety checked by a qualified safety assessor before it is made available to consumers.
The core safety document
What Is a Cosmetic Product Safety Report?
A CPSR records the formal safety assessment of a cosmetic product.
Part A · Safety Information
This brings together the information required to assess the formulation, including ingredients, concentrations, physical and chemical characteristics, stability, microbiological quality, exposure and toxicological information.
Part B · Safety Assessment
This contains the qualified assessor's conclusion about the safety of the finished cosmetic product, together with relevant reasoning, warnings or instructions where required.
The assessment therefore looks at far more than whether individual ingredients are commonly found in skincare.
It considers how all of those ingredients come together in the finished product and whether the formulation is considered safe under normal and reasonably foreseeable conditions of use.
Inside the safety assessment
What Does a Cosmetic Safety Assessor Consider?
A number of different factors contribute to the final safety conclusion.
The Formula
Ingredients, concentrations, impurities and relevant toxicological information are considered.
Consumer Exposure
The assessor considers how much product may be used, how frequently it is applied and how much exposure this creates.
How the Product Is Used
A rinse-off cleanser is assessed differently from a serum or moisturiser designed to remain on the skin.
Microbiological safety
What Is ISO 11930 Challenge Testing?
Water-containing cosmetics need an appropriate system for maintaining microbiological quality throughout their intended use.
Microbiological challenge testing is used to assess the effectiveness of a cosmetic product's antimicrobial protection system.
ISO 11930 provides a recognised method for evaluating the antimicrobial protection of a cosmetic formulation under defined test conditions.
In practical terms, the testing helps establish whether the product's preservation system is able to control specified microorganisms appropriately.
Why This Matters
A cosmetic product may be microbiologically acceptable when it is first manufactured, but it also needs to remain appropriately protected during storage and normal consumer use.
Challenge testing therefore provides a different kind of information from routine microbiological testing of a newly manufactured batch.
Testing over time
Why Is Skincare Stability Tested?
Skincare needs to remain suitable after it leaves the factory, not simply on the day it is manufactured.
Different Temperatures
Formulations can be stored under controlled conditions at different temperatures to assess how they behave over time.
Temperature Cycling
Products may also be moved between low and high temperatures to help evaluate their stability under changing environmental conditions.
Physical Stability
Appearance, consistency, pH, viscosity and other relevant physical characteristics can form part of the wider stability review.
Packaging Compatibility
The formulation and its packaging also need to remain compatible during the intended shelf life.
Pure Tone Aesthetics product standards
How Is Pure Tone Skincare Safety Assessed?
Our current documented skincare formulations each have their own independent safety assessment.
The Foaming Facial Cleansing Gel, Polynucleotide Serum, Polynucleotide Moisturising Cream and Conductor & Gliding Gel have each undergone an independent Cosmetic Product Safety Assessment.
The respective reports assess areas including ingredient safety, toxicological information, consumer exposure, microbiological quality, product stability and normal or reasonably foreseeable use.
Each of the four documented formulations has also passed ISO 11930 microbiological challenge testing.
Foaming Facial Cleansing Gel
Independently safety assessed as a rinse-off facial cosmetic and supported by microbiological and stability testing.
Polynucleotide Serum
Independently safety assessed as a leave-on facial cosmetic, including the finished formulation and anticipated consumer exposure.
Polynucleotide Moisturising Cream
Independently safety assessed as a leave-on moisturising cosmetic, with microbiological safety and stability considered.
Conductor & Gliding Gel
Independently safety assessed as a cosmetic formulation designed for use alongside compatible skincare devices.
Documented stability testing
The Same Core Stability Programme Across Four Formulations
The current safety documentation for these products records a consistent controlled stability-testing programme.
3 Months
Each documented formulation underwent stability assessment over a three-month controlled testing period.
45°C · 25°C · 4°C
Products were stored under three different controlled temperature conditions.
-5°C to 50°C
Temperature cycling was also used to assess performance across more extreme changing conditions.
36-Month Assigned Shelf Life
Based on the available stability data, the Foaming Facial Cleansing Gel, Polynucleotide Serum, Polynucleotide Moisturising Cream and Conductor & Gliding Gel have each been assigned a 36-month shelf life.
Their respective safety documentation also states that the products are considered stable under normal and reasonably foreseeable conditions of use.
Putting the technical language into context
What Does This Actually Mean for Customers?
Most people will never read a Cosmetic Product Safety Report — and they should not need to.
The purpose of the regulatory process is not to turn every skincare customer into a toxicologist.
It is to ensure that someone suitably qualified has examined the information behind the finished cosmetic product and reached a professional safety conclusion before it reaches the market.
That process is separate from whether a product will deliver a particular cosmetic benefit.
A safety assessment tells us whether the formulation is considered safe for its intended cosmetic use. Claims about hydration, radiance, elasticity, lines or other visible skin improvements require their own appropriate supporting evidence.
Safety Evidence Is Different From Performance Evidence
A CPSR is not a clinical efficacy study and a clinical study is not a substitute for a safety assessment.
Both forms of evidence can be important, but they answer different questions.
Transparency without unnecessary disclosure
Why Don't We Publish the Full CPSRs Online?
A Cosmetic Product Safety Report is a technical regulatory document, not a consumer marketing certificate.
The reports can contain detailed formulation information, ingredient concentrations, toxicological calculations, supplier information and other commercially sensitive regulatory data.
Publishing the complete report would therefore provide considerably more information than most customers need while potentially disclosing formulation details that would normally remain within the Product Information File.
Instead, we publish clear information about the relevant safety assessment and testing and maintain the complete documentation within the appropriate product regulatory records.
CPSR · microbiology · stability
Skincare Safety Assessment FAQs
Do skincare products have to be safety assessed in the UK?
Yes. Cosmetic products made available to consumers in Great Britain must be safe for human health and must undergo an appropriate safety assessment before being placed on the market.
What is a Cosmetic Product Safety Report?
A Cosmetic Product Safety Report, or CPSR, is the formal safety assessment for a cosmetic product. It considers the finished formulation, ingredients, concentrations, consumer exposure, microbiological quality, stability and other relevant safety information.
Who can complete a cosmetic safety assessment?
The assessment must be completed by a suitably qualified professional with appropriate expertise in areas such as pharmacy, toxicology, medicine or a comparable discipline.
What is ISO 11930 microbiological challenge testing?
ISO 11930 challenge testing is used to evaluate the antimicrobial protection of a cosmetic product and assess whether its preservation system can appropriately control specified microorganisms under defined test conditions.
Why are skincare products stability tested?
Stability testing helps assess whether a formulation remains suitable over time and when exposed to controlled environmental conditions, including different temperatures and temperature cycling.
Are Pure Tone Aesthetics skincare products independently safety assessed?
Our currently documented Foaming Facial Cleansing Gel, Polynucleotide Serum, Polynucleotide Moisturising Cream and Conductor & Gliding Gel have each undergone their own independent Cosmetic Product Safety Assessment.
Have Pure Tone skincare products passed ISO 11930 challenge testing?
Yes. The Foaming Facial Cleansing Gel, Polynucleotide Serum, Polynucleotide Moisturising Cream and Conductor & Gliding Gel have each passed ISO 11930 microbiological challenge testing according to their current product safety documentation.
How long is the assigned shelf life of these Pure Tone skincare products?
Based on their current stability testing, the Foaming Facial Cleansing Gel, Polynucleotide Serum, Polynucleotide Moisturising Cream and Conductor & Gliding Gel have each been assigned a 36-month shelf life.
Does a CPSR prove that a skincare product works?
No. A CPSR evaluates the safety of the cosmetic formulation. Performance claims such as hydration, radiance or visible wrinkle improvement require separate appropriate supporting evidence.
Why doesn't Pure Tone publish the complete CPSR online?
A CPSR can contain detailed formulation information, ingredient concentrations, toxicological calculations and commercially sensitive regulatory data. We therefore publish clear summaries of the relevant safety assessment and testing while maintaining the complete reports within the appropriate regulatory documentation.
The important part
Good Skincare Starts Long Before the Product Reaches Your Shelf
Most of the work behind cosmetic product safety is invisible to the person eventually using the product.
Ingredient review, toxicological assessment, consumer exposure, microbiological testing, stability data and regulatory documentation all sit behind the simple bottle, pump or jar seen on a bathroom shelf.
That is exactly how it should be.
Customers should not need to become regulatory experts to buy skincare, but they should be able to find clear information about how the products they use have been assessed and tested.
Safety · testing · transparency
Learn More About Our Product Standards
Explore how Pure Tone Aesthetics approaches independent cosmetic safety assessment, microbiological challenge testing, stability testing and regulatory documentation.