Let’s stir up some magic in the lab with today’s hot topic: what cosmetic tests are legally required before you can sell your product in Europe and complete your EU cosmetic safety assessment.

You’ve got your formula idea, maybe a balm, a serum, or a rich face cream, and you’re ready to turn it into your brand’s first signature product. But then the reality of regulation hits: what does the law actually require? Do you really have to do tests? How much do they cost? And how complicated is it, really?

Don’t panic. Cosmetic compliance may sound intimidating at first, but it follows a very clear and logical structure. Once you understand the purpose behind each test and how they feed into the EU cosmetic safety assessment, the process becomes far less mysterious.

This guide breaks down the essential cosmetic tests required before placing a cosmetic product on the EU and UK markets and explains why they matter, when they’re mandatory, and how they support the final safety documentation, including answering the common question: what is a cosmetic product safety report and why it is required.

WHY COSMETIC TESTING MATTERS

Before you can sell a cosmetic product anywhere in the European Union or the United Kingdom, you must comply with Regulation (EC) No 1223/2009 (and its UK equivalent).

This regulation ensures that all cosmetic products are safe for human health, properly labelled, and supported by scientific data. It is not just bureaucracy. It is a legal and ethical safeguard for both consumers and your brand’s credibility, and it forms the legal foundation of every EU cosmetic safety assessment.

Testing is not about red tape. It is about proof that your formula is stable, microbiologically safe, and non-toxic when used as intended. All of this evidence feeds directly into the cosmetic product safety documentation.

1. THE STABILITY TEST – PROOF THAT YOUR PRODUCT PERFORMS OVER TIME

WHAT IT IS AND WHY IT’S MANDATORY

The stability test checks whether your product maintains its texture, colour, scent, pH and performance over time and under different conditions. A stable product remains consistent throughout its shelf life and period after opening. This data is a core requirement for completing the EU cosmetic safety assessment.

WHAT THE STABILITY TEST EVALUATES

Physical and chemical stability

Compatibility between formula and packaging

Resistance to temperature and light

PAO or expiry date determination

Once completed, your toxicologist uses this data to validate the claimed shelf life and confirm that the product behaves safely under real conditions, which is essential when preparing the Cosmetic Product Safety Report.

2. THE CHALLENGE TEST (PRESERVATIVE EFFICACY TEST)

WHEN IT’S REQUIRED

The challenge test, also known as the Preservative Efficacy Test, is mandatory for all water-containing formulations such as emulsions, gels, creams, or toners.

If your product contains no water, your toxicologist must include a written justification within the safety documentation explaining why the test is not required. This justification becomes part of the cosmetic product safety report.

WHAT THE CHALLENGE TEST DOES

The challenge test verifies that your preservative system can control microbial growth throughout the product’s lifespan. This microbiological data is legally required to answer what is a cosmetic product safety report at a practical level, because without it, the report cannot be finalised.

3. THE COSMETIC SAFETY ASSESSMENT (TOXICOLOGICAL EVALUATION)

THE HEART OF YOUR PRODUCT INFORMATION FILE

The safety assessment, also known as the CPSR, is the most critical document in the EU cosmetic safety assessment process.

If you are asking what is a cosmetic product safety report, this is it. The CPSR is the document that confirms, in writing, that your cosmetic product is safe for human health when used as intended.

It must be written and signed by a qualified toxicologist or safety assessor registered in the EU or the UK.

WHAT IT INCLUDES

The assessor reviews:

Your full INCI list and ingredient concentrations

All supporting toxicological data for each ingredient

Results of stability and microbiological testing

Packaging compatibility

Intended use and application area

Target population

Once approved, the Cosmetic Product Safety Report becomes a mandatory section of your Product Information File and is required to notify your product on the CPNP.

4. PACKAGING COMPATIBILITY AND LABELLING CHECKS

While not classified as tests, these checks are integral to a valid EU cosmetic safety assessment.

Packaging compatibility data confirms that your container does not interact with the formula. Labelling reviews ensure the information on-pack aligns with the safety assessment conclusions and the Cosmetic Product Safety Report.

5. THE PRODUCT INFORMATION FILE (PIF)

The Product Information File is the central compliance document that brings together all elements of the EU cosmetic safety assessment, including the Cosmetic Product Safety Report.

When authorities inspect a brand, this is the first file they request. A complete and well-structured PIF demonstrates that you understand both what is required and what a cosmetic product safety report is used for in practice.

6. CPNP REGISTRATION AND NOTIFICATION

Once testing and the Cosmetic Product Safety Report are complete, your product must be notified on the CPNP before sale.

Without a validated EU cosmetic safety assessment, CPNP registration cannot legally occur.

HERE ARE MY FINAL THOUGHTS

If you remember one thing, let it be this: testing is not optional. It is the backbone of every EU cosmetic safety assessment and the reason your Cosmetic Product Safety Report exists.

Understanding what is a cosmetic product safety report helps you see compliance not as an obstacle, but as the system that protects your customers, your brand, and your ability to scale.

Here’s to formulas that work and brands that thrive!

From my lab to yours,

Rose