Beauty ingredient research

Beauty ingredients explained in plain English

Browse the review database to understand what an ingredient is, what it does in a beauty formula, when it is useful, and when it deserves caution across skincare, haircare, bodycare, makeup, and more.

20769

Reviewed ingredients

524

Low-concern standouts

2884

Need usage caution

Showing 60 of 842
AllUV absorberUV filterabrasiveabsorbentacne treatmentactiveactive ingredientadhesivealkalizing agentamino acidanti-aginganti-androgenanti-cavityanti-cavity agentanti-inflammatoryanti-irritantanticariesanticavity agentantidandruffantifungalantimicrobialantioxidantantiperspirantantiplaqueastringentbarrier repairbarrier supportbarrier-repairbarrier-supportbinderbinding agentbiotechbiotechnologybond-builderbotanicalbotanical extractbotanical oilbotanical waterbrighteningbrightening agentbufferbuffering agentcell-communicating ingredientceramidechelating agentchemicalchemical intermediateclaycleansercleansingcleansing agentcolorantconditionerconditioningconditioning agentcooling agentcosmeticcosmetic additivecosmetic colorantcosmetic ingredientcosmetic pigmentcosmetic powdercosmetic-texturizercosmetic-waxcosmeticscrosslinking agentdelivery agentdelivery systemdenaturantdeodorantdeodorant agentdepigmenting agentdepilatorydepilatory agentdesensitizing agentdyedye intermediatedye precursordye-intermediateemollientemulsifierenzymeessential oilexfoliantexperimentaleyelashfermentfilm formerfilm-formerfilm-formingfilm-forming agentfirming agentfixativeflavoring agentformulationfragrancefragrance ingredientfunctional ingredientgashair carehair colorhair coloranthair conditionerhair dyehair removalhair-carehair-colorhaircarehumectantindustrialinsecticideintermediatelashlash carelash enhancerlash-and-browlip carelipidmakeupmarine extractmasking agentmicrobiomemicrobiome modulatormineralmoisturizernail carenail-careocclusiveoilopacifieropacifying agentoptical agentoral careotheroxidative dyeoxidative dye precursoroxidizing agentpH adjusterpain reliefpenetration enhancerpeptidepersonal careph adjusterpharmaceuticalpheromonepigmentplant oilplasticizerpolymerpolymer precursorprebioticprescription-drugpreservativepreservative boosterprobioticprocessing agentprocessing aidpropellantproteinpurifyingreducing agentretinoidscalp caresebum regulatorsebum-regulatorself-tannerself-tanningsensory additivesensory agentsensory modifiersiliconeskin barrierskin barrier supportskin conditionerskin conditioningskin conditioning agentskin lighteningskin protectantskin-conditioningskin-conditioning agentskin-identicalskin-identical ingredientskin-lighteningskin-lightening agentskincaresolventsoothingsoothing agentstabilizerstimulantsunscreensurfactantsyntheticsynthetic colorantsynthetic dyesynthetic resinsynthetic-coloranttexture enhancertexturizerthickenertoneruv-absorberuv-filtervasoactivevasodilatorviscosity controlviscosity controllingviscosity controlling agentvitaminwax

Film Former

2-Hydroxyethyl Acrylate

2-HYDROXYETHYL ACRYLATE

2.5

2-Hydroxyethyl acrylate is a synthetic raw material used to create polymers that improve product texture and stability, but it is rarely found as a standalone ingredient in consumer products.

Irritation

moderate

Source

synthetic

beautyskincarefilm-former
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Film Former

4-Hydroxybutyl Acrylate

4-HYDROXYBUTYL ACRYLATE

2.5

4-Hydroxybutyl acrylate is a synthetic monomer used in polymer ingredients for nail and adhesive cosmetics, but it is rarely present as a standalone ingredient in leave-on skincare.

Irritation

moderate

Source

synthetic

beautyskincarefilm-former
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Film Former

Acacia Catechu Gum

Acacia Catechu Gum

3.5

A natural gum that helps create a light, temporary film on skin, often used to improve texture or hold ingredients together.

Irritation

low

Source

natural

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Film Former

Acacia Senegal Gum Extract

Acacia Senegal Gum Extract

4.0

A gentle, plant-derived gum that helps smooth and soothe skin while creating a light, non-sticky protective film.

Irritation

low

Source

natural

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Film Former

Acacia Seyal Gum Extract

Acacia Seyal Gum Extract

3.8

A gentle, plant-based gum that helps form a light, soothing film on skin, but its benefits are mostly texture-related rather than deeply active.

Irritation

low

Source

natural

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Film Former

Acetiminoacetoxy Methacrylate Polymer

TRIS(ACETIMINOACETOXYETHOXY METHACRYLATE) PPG-6 TRIMETHYLOLPROPANE

3.5

A synthetic film former that helps products stay put, but it's mostly used in specialty items like nail polish rather than everyday skincare.

Irritation

low

Source

synthetic

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Film Former

Acrylate Copolymer Film Former

BIS-PENTAERYTHRITYL TRIACRYLATE POLY(1,4-BUTANEDIOL)-9/GLYCOL/IPDI COPOLYMER

3.5

A synthetic film former that helps makeup stay put, but offers no skincare benefit and may feel tight on dry skin.

Irritation

low

Source

synthetic

beautycosmeticsfilm-former
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Film Former

Acrylate Film Former

GLYCIDYL C8-11 ACIDATE/GLYCERIN/PHTHALIC ANHYDRIDE COPOLYMER

3.5

A synthetic film former that helps products stay put, but its phthalate-related name may cause confusion — it is not a phthalate of concern.

Irritation

low

Source

synthetic

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Film Former

Acrylate/Dimethicone Copolymer

C8-22 ALKYL ACRYLATE/BUTYL DIMETHICONE METHACRYLATE COPOLYMER

3.8

A safe, synthetic film-former that helps makeup last longer and feel smoother without clogging pores.

Irritation

low

Source

synthetic

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Film Former

Acrylates Copolymer Blend

DIMETHYLAMINOETHYLMETHACRYLATE/HEMA/LAURYL METHACRYLATE COPOLYMER

3.5

A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

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Film Former

Acrylates Crosspolymer

ACRYLATES/TRIMETHYLSILOXYPROPYL METHACRYLATE CROSSPOLYMER

3.8

A silicone-based film former that improves water resistance and wear time, generally safe but may feel heavy on some skin types.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Acrylates Phosphate Copolymer

Acrylates/Methacryloyloxyethyl Phosphate Copolymer

4.0

A safe, synthetic film-former that helps products spread smoothly and stay put without clogging pores.

Irritation

low

Source

synthetic

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Film Former

Acrylates Succinate Copolymer

ACRYLATES/C1-2 SUCCINATES/HYDROXYACRYLATES COPOLYMER

4.0

A safe synthetic polymer that helps products stay put and feel smooth, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Acrylates/HEMA Copolymer

ACRYLATES/HEMA COPOLYMER

3.5

A safe, synthetic film-former that helps makeup and sunscreen stay put without clogging pores.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Acrylates/Silicone Copolymer

ACRYLATES/STEARYL ACRYLATE/DIMETHICONE METHACRYLATE COPOLYMER

3.8

A synthetic film-former that helps products stay put and resist water, but may feel tight or heavy on some skin types.

Irritation

low

Source

synthetic

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Film Former

Acrylates/Soybean Oil Copolymer

ACRYLATES/HYDROXYPROPYL EPOXIDIZED SOYBEAN OIL COPOLYMER

3.8

A safe film-forming polymer that helps makeup and sunscreen stay put without clogging pores.

Irritation

low

Source

semi-synthetic

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Film Former

Acrylic Copolymer Blend

ACRYLIC ACID/ISOBORNYL METHACRYLATE/ISOBUTYL METHACRYLATE COPOLYMER

3.5

A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

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Film-Former

Acryloyl Morpholine

Acryloyl Morpholine

3.8

A synthetic film-former that helps products stay put on skin and resist water, but it's not a moisturizer or active ingredient.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Acryloyloxy Propyltrimethoxysilane

ACRYLOYLOXY PROPYLTRIMETHOXYSILANE

3.5

A synthetic film-former that helps products adhere to skin or nails, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

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Film Former

Adipic Acid/PPG-10 Copolymer

ADIPIC ACID/PPG-10 COPOLYMER

3.8

A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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