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Skincare ingredient library
What each ingredient is, what it does, the concentration at which it actually does it, and where EU rules put a limit on it. Every figure here is read from the same data the YARAI app scores with, so this library and the app cannot disagree.
These 78 entries are the ones with a concentration threshold or a regulatory limit worth publishing. The app itself scores against a larger set.
- AdapaleneMedium concern
- AmodimethiconeLow concern
- Ascorbic AcidLow concern
- Ascorbyl GlucosideLow concern
- Azelaic AcidLow concern
- Behentrimonium ChlorideLow concern
- Benzoyl PeroxideMedium concern
- Benzyl AlcoholMedium concern
- Benzyl BenzoateMedium concern
- Benzyl SalicylateMedium concern
- BHAMedium concern
- BHTLow concern
- Butylphenyl MethylpropionalMedium concern
- CaffeineLow concern
- Cetrimonium ChlorideLow concern
- CitralMedium concern
- Coco-glucosideLow concern
- Coenzyme Q10Low concern
- CoumarinMedium concern
- CyclopentasiloxaneMedium concern
- DimethiconeLow concern
- Evernia Furfuracea ExtractMedium concern
- Evernia Prunastri ExtractMedium concern
- FormaldehydeHigh concern
- GeraniolMedium concern
- GluconolactoneLow concern
- Glycolic AcidLow concern
- Green Tea ExtractLow concern
- HomosalateMedium concern
- Hydrolyzed KeratinLow concern
- Hydrolyzed Wheat ProteinMedium concern
- HydroquinoneHigh concern
- HydroxycitronellalMedium concern
- Hydroxyisohexyl 3-cyclohexene CarboxaldehydeMedium concern
- Hydroxypinacolone RetinoateMedium concern
- Imidazolidinyl UreaHigh concern
- Iron OxidesLow concern
- IsobutaneLow concern
- IsoeugenolMedium concern
- Isopropyl MyristateLow concern
- IsotretinoinHigh concern
- Lactic AcidLow concern
- Lauric AcidLow concern
- Mandelic AcidLow concern
- MethylchloroisothiazolinoneHigh concern
- MethylisothiazolinoneHigh concern
- MicaLow concern
- Myristic AcidLow concern
- NiacinamideLow concern
- OctocryleneMedium concern
- OxybenzoneMedium concern
- Palmitic AcidLow concern
- Piroctone OlamineLow concern
- Potassium HydroxideLow concern
- RetinaldehydeMedium concern
- Retinoic AcidHigh concern
- RetinolMedium concern
- Retinyl AcetateLow concern
- Retinyl LinoleateLow concern
- Retinyl PalmitateLow concern
- Retinyl PropionateLow concern
- Retinyl RetinoateLow concern
- Rosehip OilLow concern
- Salicylic AcidLow concern
- Selenium SulfideMedium concern
- SilicaLow concern
- Sodium Ascorbyl PhosphateLow concern
- Sodium Cocoyl IsethionateLow concern
- Sodium LactateLow concern
- SorbitolLow concern
- Stearamidopropyl DimethylamineLow concern
- TalcMedium concern
- TazaroteneHigh concern
- Tocopheryl AcetateLow concern
- TretinoinHigh concern
- TrifaroteneMedium concern
- UreaLow concern
- Zinc PyrithioneLow concern
Why concentration, not just presence
An ingredient list is ordered by quantity. A substance near the end of a list is present in a very different amount than the same substance near the start, and for most actives that difference decides whether it does anything at all. YARAI scores by estimated concentration read from that position rather than by presence alone.
Last built 2026-10-12. EU figures cite Regulation (EC) No 1223/2009. Nothing here is medical advice.