Glossary · Formulation
What Is Challenge Test (ISO 11930)?
A challenge test, standardized as ISO 11930 for cosmetics, deliberately inoculates a finished formula with known microorganisms and measures whether its preservative system kills them within defined limits. It is the only direct evidence that a product's preservation is adequate for its intended use and shelf life.
Why it matters when you source
Preservation failures are found by regulators and reviewers, not by looking at the product. Ask whether the factory validates every formula with a challenge test before scale-up — we run microbiology on every batch and ship the report with the order.
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