Guides and insights on cosmetic testing & EU compliance.
Cosmetic colour change stability explained: why colour, odour and pH shift, what stability tests check and how to set acceptance criteria.
Read more →Cosmetic light stability explained: which ingredients are light-sensitive, how clear and tinted packs differ and how to test a pack against a dark control.
Read more →Natural cosmetics stability: why oils oxidise, preservation is harder and extracts change, plus how to test and protect a natural formula before launch.
Read more →Patch test volunteers number explained: why panel size matters, what a few dozen volunteers can and cannot show, and how to plan a skin compatibility study.
Read more →Cosmetic irritation vs allergy: how the two skin reactions differ, what causes each, and how brands can reduce risk with formulation, testing and labelling.
Read more →Non comedogenic claim explained: what it means, why ingredient lists are not proof, and which evidence EU rules expect before you put it on a label.
Read more →Ophthalmologically tested explained: what the claim means, which evidence EU rules expect, how eye safety is assessed, and mistakes that get labels challenged.
Read more →Baby cosmetics safety testing explained: why babies need extra care, which assessments and tests the EU file needs, and claims to handle with caution.
Read more →Nanomaterials cosmetics regulation in the EU: definition, notification six months before launch, the (nano) label word and what the safety report must show.
Read more →CMR substances cosmetics rules explained: what carcinogenic, mutagenic and reproductive toxic mean, Article 15 bans, exceptions and how to check formulas.
Read more →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.
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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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