Cosmetic challenge testing, also known as preservative efficacy testing or antimicrobial effectiveness testing, is a critical procedure in the development and safety assessment of cosmetic and personal care products. Its primary purpose is to evaluate the ability of a product’s preservative system to protect against microbial contamination over its intended shelf life and under normal usage conditions.

Here are the key aspects of cosmetic challenge testing:

  1. Sample Preparation: A sample of the cosmetic or personal care product is inoculated with a carefully selected panel of microorganisms, including bacteria, yeasts, and molds. These microorganisms represent potential contaminants that the product might encounter during its use.
  2. Incubation Period: The samples are incubated under controlled conditions that simulate real-world storage and usage conditions. Typically, multiple time points and temperatures are used to mimic different scenarios.
  3. Monitoring: Throughout the incubation period, the samples are regularly examined for signs of microbial growth or contamination. This includes checking for changes in appearance, odor, and other relevant characteristics.
  4. Evaluation: The test results are assessed to determine whether the product’s preservative system effectively prevents or reduces microbial contamination and growth. A successful challenge test indicates that the product’s preservatives are capable of maintaining its microbiological integrity.
  5. Regulatory Compliance: Cosmetic challenge testing is often required by regulatory agencies, such as the U.S. Food and Drug Administration (FDA) and the European Union’s Cosmetics Regulation. It ensures that cosmetic and personal care products meet safety and quality standards.
  6. Product Safety: Successful challenge testing helps prevent microbial contamination that could lead to product spoilage, adverse reactions in consumers, or the growth of harmful pathogens. It contributes to the overall safety of the product.

The specific requirements for cosmetic challenge testing can vary depending on regulatory guidelines and product formulations. The tests are typically conducted by qualified laboratories with expertise in microbiology and cosmetic testing. The results of these tests play a crucial role in product development, quality control, and ensuring that cosmetics are safe for consumer use.


Challenge (Preservative Efficacy) Testing:

  • Sample Size: A 150ml sample is required.
  • Test Duration: The test duration is 5 weeks.
  • Price: £160 + VAT per product.


Vegan Challenge Testing

  • Price: £195 + VAT per product.

This revised version aims to provide a clearer presentation of your services and their associated details for improved readability and understanding.

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