Challenge testing is a critical step in validating the effectiveness of your product’s preservative system. Our expert-led challenge testing service helps ensure your cosmetic formulations remain safe, stable, and compliant—giving consumers and regulators full confidence in your brand. Why Challenge Testing is ImportantIf your product contains water, it is at risk of microbial contamination during use. To legally sell cosmetics in the UK, EU, and many other regions, you must demonstrate that your preservative system effectively controls bacteria, yeast, and mold. Challenge testing, also known as Preservative Efficacy Testing (PET), simulates contamination by introducing microorganisms and monitoring how well your product neutralises them over time. We follow ISO 11930 and USP standards—accepted by regulators worldwide. What We TestWe conduct challenge testing on a wide variety of cosmetic and personal care products, including:- Creams & Lotions- Gels, Serums & Cleansers- Shampoos & Conditioners- Body Washes & Scrubs- And more! What You’ll Receive- Final Challenge Test Report (suitable for CPSRs & regulatory files)- Clear Pass/Fail outcomes based on ISO 11930 criteria How to Submit Your Product for Testing- Send 300g or 300ml of product in the final packaging (or equivalent in smaller units).- Ship your product to:Naturally Balmy LtdUnit 17Riverside Park Industrial EstateStation RoadWimborneDorset BH21 1QU For any questions, feel free to contact us.
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