Which skincare ingredients are flagged by our screens?

We read the ingredient list of 252 cleansers, moisturisers, sunscreens, serums and toners and run three checks on each.

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Not medical advice. These checks read the published ingredient list against public rule lists; results vary from person to person, formulas change, and ingredient lists can be incomplete. Ask a dermatologist or your doctor (and in pregnancy, your midwife or obstetrician) before relying on them.