Margin of safety cosmetics explained: NOAEL divided by systemic exposure, the usual minimum of 100, a worked example and how to prepare data for your CPSR.
Read more →Water activity cosmetics guide: what aw and pH mean, which microbes grow, how preservatives depend on pH and why a challenge test is still needed.
Read more →Salicylic acid cosmetics regulation in the EU: preservative vs active use, typical limits, conditions, the SCCS opinion on children and what to test.
Read more →Vitamin C serum stability explained: why ascorbic acid browns, how pH and packaging help, and which stability, challenge and safety tests you need.
Read more →Hyaluronic acid cosmetics: what to check on safety, which claims hold up, and why water-rich gels and serums need preservation and stability testing.
Read more →CBD cosmetics EU: how the Cosmetics Regulation treats cannabis ingredients, what the SCCS opinion says on safe levels and what brands should document.
Read more →Titanium dioxide cosmetics regulation: Annex VI rules for titanium dioxide and zinc oxide, nano forms, inhalation limits on sprays and powders, and tests.
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A challenge test is required for every cosmetic product except microbiologically low-risk ones, which are:
A challenge test is required for every cosmetic product except microbiologically low-risk ones, which are:
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