Before a cosmetic product reaches store shelves, it must pass a series of safety, stability, and regulatory tests to confirm that it is safe for consumers to use. These tests cover everything from microbiological safety to skin compatibility, and they are required by law in most regulated markets. The sections below walk through the key questions brands and manufacturers face when preparing a product for launch.
Cosmetic products typically go through safety, stability, microbiological, and dermatological testing before they can be sold. Each test serves a distinct purpose: safety testing confirms the formula poses no risk to human health, stability testing checks that the product maintains its quality over time, microbiological testing verifies it is free from harmful contamination, and dermatological testing assesses how the skin responds to the formula.
The specific tests required depend on the product type and the market it is intended for. A leave-on skin cream, for example, faces stricter scrutiny than a rinse-off shampoo, because its contact time with the skin is longer. Products intended for sensitive skin or for use around the eyes may require additional patch testing or ophthalmological assessments. Fragrance ingredients are also commonly evaluated separately, since they are among the most frequent triggers of skin reactions.
In practice, most products go through a combination of the following:
In the European Union, cosmetic product testing is governed by EU Cosmetics Regulation 1223/2009, which makes safety assessment and product notification mandatory for every cosmetic placed on the market. Similar frameworks exist in the United Kingdom, the United States, and other major markets, though the specific requirements differ by region.
Under EU law, every cosmetic product must have a Product Information File (PIF) that documents the formula, manufacturing method, safety assessment, and evidence of the product’s safety. This file must be kept accessible to authorities for ten years after the last batch is placed on the market. Non-compliance can result in products being removed from sale and significant legal liability for the brand.
Brands selling into multiple markets need to account for the fact that regulations are not harmonised globally. What qualifies as a cosmetic in Europe may be classified as an over-the-counter drug in the United States, triggering a completely different set of requirements. Understanding the regulatory landscape of each target market is therefore an essential part of product development, not an afterthought.
A cosmetic product safety assessment is a formal evaluation carried out by a qualified safety assessor to determine whether a cosmetic product is safe for human use under normal and reasonably foreseeable conditions. Under EU Cosmetics Regulation 1223/2009, this assessment is a legal requirement and must be documented in a safety report that forms part of the Product Information File.
The safety report has two parts. The first covers the safety profile of each ingredient, including toxicological data, concentration levels, and any known restrictions or prohibitions under the regulation. The second part is the safety assessor’s overall conclusion, which weighs the cumulative exposure of all ingredients and considers the intended use, application area, and target consumer group, including whether the product might be used by children or people with sensitive skin.
Only a person with a relevant qualification in pharmacy, toxicology, medicine, or a related discipline is permitted to sign off on the safety assessment under EU law. This means brands cannot simply write the report themselves; they need to work with a certified professional or a laboratory partner with in-house assessment expertise.
Stability testing for cosmetic products involves exposing a formula to controlled conditions over a defined period to observe how it changes physically, chemically, and microbiologically. The goal is to confirm that the product maintains its intended quality, safety, and performance throughout its shelf life and period after opening.
There are two main approaches used in the industry:
During testing, assessors monitor parameters such as colour, odour, texture, pH, viscosity, and preservative efficacy at regular intervals. Packaging compatibility is also evaluated, since some ingredients can interact with plastic or glass containers over time. The results inform the minimum durability date or the period after opening symbol shown on the finished product.
No. Animal testing for cosmetic products and their ingredients has been banned in the European Union since 2013, under EU Cosmetics Regulation 1223/2009. This ban covers both the testing of finished products and the testing of individual ingredients intended for use in cosmetics, regardless of where in the world the testing takes place. Products tested on animals elsewhere cannot be sold in the EU market.
The EU ban was a landmark shift in the industry and has influenced regulatory developments in other markets. The United Kingdom maintained the same ban after leaving the EU, and a growing number of countries are moving toward similar restrictions. However, animal testing is still permitted and, in some cases, required in certain markets outside Europe, which creates complexity for brands operating globally.
In place of animal testing, the industry has developed a range of validated alternative methods, including in vitro cell culture tests, reconstructed human tissue models, and computational toxicology tools. These alternatives are now well established and capable of meeting the safety evidence requirements set out in EU regulation.
Under EU law, the Responsible Person is legally accountable for ensuring a cosmetic product meets all regulatory requirements, including safety testing, before it is placed on the market. The Responsible Person is typically the brand owner, the manufacturer, or an authorised representative based in the EU or UK, depending on the market.
In practice, the actual testing is carried out by laboratories, safety assessors, and contract manufacturers who have the equipment and expertise to conduct the required evaluations. Brands, particularly smaller ones, often rely on external partners to manage this process. The Responsible Person remains legally accountable for the outcome, however, even when the work is outsourced.
This distinction matters because it means brands cannot simply hand over responsibility to a testing lab and consider the job done. They need to stay engaged with the process, understand what has been tested and why, and ensure all documentation is accurate and complete. Choosing the right manufacturing and testing partner is therefore one of the most consequential decisions a brand makes during product development.
Bringing a cosmetic product to market involves a lot of moving parts, and navigating the testing and regulatory requirements is one of the most complex pieces of the puzzle. That is where we come in. At Rebel Nature, we support brands through every stage of the process, from initial formulation to a finished, market-ready product.
As a contract manufacturer specialising in 100% natural cosmetics, we work with brands of all sizes, whether you need 2,000 or 50,000 units. Our in-house expertise covers:
We believe that transparency and safety go hand in hand, and our mission is to help bring better, cleaner products into the personal care industry. If you are developing a new product and want a partner who understands both the science and the regulations, we would love to hear from you. Get in touch with our team to talk through your project.
The timeline varies depending on the product type and the markets you are targeting, but brands should generally budget between three and six months for a complete testing programme, including stability, microbiological, and safety assessment work. Accelerated stability testing can compress some of this timeline during development, but real-time testing will continue running in parallel. Starting the testing process early in your product development schedule, rather than treating it as a final step, is the most effective way to avoid launch delays.
Shelf life refers to the minimum durability date, the point up to which the product maintains its intended performance when stored unopened under appropriate conditions, indicated by the 'best before' symbol on packaging. The period after opening (PAO) is a separate declaration, shown as an open jar symbol followed by a number of months, indicating how long the product remains safe to use once it has been opened. Both are determined through stability and microbiological testing, and both must be substantiated by data held in the Product Information File.
It depends on the nature and scale of the change. Even a seemingly minor adjustment, such as swapping a preservative, changing a fragrance concentration, or switching a raw material supplier, can alter the safety profile, stability, or microbiological performance of the formula. Any change should be reviewed by your safety assessor to determine whether a full or partial re-test is required. Skipping this step puts the Responsible Person at legal risk and could mean the existing safety report is no longer valid.
A failed stability test is a signal that the formula, packaging, or storage conditions need to be revisited before the product can move forward. Common causes include preservative systems that are not robust enough, ingredient interactions that cause separation or discolouration, or packaging materials that are incompatible with the formula. Rather than seeing a failure as a setback, it is best treated as useful data: it tells you exactly where the formula needs to be strengthened before it reaches consumers.
No. Under EU Cosmetics Regulation 1223/2009, a safety report signed by a qualified professional, typically someone with a degree in pharmacy, toxicology, medicine, or a closely related field, is a mandatory part of the Product Information File. Without it, the product cannot legally be placed on the EU market. Brands who do not have an in-house qualified assessor need to work with an external safety assessor or a contract manufacturing partner that provides this as part of their service.
Natural and organic cosmetics are subject to exactly the same regulatory testing requirements as conventional cosmetics under EU law; there is no separate or reduced framework for them. However, formulating with natural ingredients can introduce additional stability and microbiological challenges, since many natural actives are more susceptible to oxidation, pH shifts, or microbial growth than their synthetic counterparts. This makes robust stability and challenge testing especially important for brands in the natural beauty space, and it is worth working with a manufacturer that has specific experience in formulating and testing natural products.
Look for a partner that offers in-house testing capabilities, including stability, microbiological, and compatibility testing, rather than one that outsources all of this to third parties with limited oversight. Experience with the regulatory requirements of your target markets is equally important, particularly if you plan to sell in both the EU and other regions. Transparency is a key indicator of a trustworthy partner: they should be able to clearly explain what tests they are running, why, and how the results will be documented in your Product Information File.
Follow us on social media to stay up to date with the latest at Rebel-Nature.
REBEL-NATURE BV COPYRIGHT 2026 ©