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

Chitin

Chitin

3.8

Chitin is a gentle, natural film-former that helps skin retain moisture and feel smooth, but it is not a standout hydrator on its own.

Irritation

low

Source

natural

beautyskincarefilm-former
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Film-Former

Chitin Glycolate

Chitin Glycolate

3.8

A gentle, film-forming humectant derived from shellfish that helps lock in moisture and smooth the skin's surface.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Chitosan

Chitosan

4.0

Chitosan is a gentle, natural film-former that helps lock in moisture and can provide a light, protective barrier on skin or hair.

Irritation

low

Source

natural

beautyskincarefilm-formerhumectant
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Film-Former

Chitosan Argininamide

Chitosan Argininamide

4.0

A gentle, film-forming ingredient that helps lock in moisture and may improve skin feel without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Chitosan Benzamide

Chitosan Benzamide

3.8

Chitosan Benzamide is a semi-synthetic ingredient that forms a breathable film on skin, potentially improving hydration and helping manage acne, but research is still early.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Chitosan Lauramide Succinamide

Chitosan Lauramide Succinamide

3.8

A gentle film-forming ingredient derived from chitosan that helps lock in moisture and improve product feel on skin.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Exfoliant

Chitosan Salicylate

Chitosan Salicylate

4.0

A gentle exfoliant that pairs salicylic acid with a soothing, film-forming biopolymer, making it a good option for acne-prone or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareexfoliantfilm-former
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Film Former

Chitosan Succinamide

Chitosan Succinamide

4.0

A gentle, water-soluble chitosan derivative that forms a breathable film on skin to lock in moisture and improve texture.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film-Former

Colophony (Rosin)

COLOPHONIUM

2.8

Colophonium is a natural pine resin that helps products stick or form a film, but it is a well-known skin allergen and may cause irritation for sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefilm-former
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Film Former

Conchiolin Powder

CONCHIOLIN POWDER

3.8

A natural protein from mollusk shells that forms a lightweight film on skin, offering a temporary smoothing and tightening effect.

Irritation

low

Source

natural

beautyskincarefilm-former
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Film Former

Cyclohexyl Phenylcarbamate

CYCLOHEXYL PHENYLCARBAMATE

3.5

A synthetic film-former that helps products feel smooth and last longer, but with limited published safety data.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Decene/Butene Copolymer

DECENE/BUTENE COPOLYMER

3.8

A synthetic polymer that helps skincare products spread smoothly and feel lightweight on the skin.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dextran

Dextran

4.0

Dextran is a gentle, sugar-derived polymer that helps products feel smooth and hydrated without clogging pores.

Irritation

low

Source

natural

beautyskincarefilm-former
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Film Former

Dextran Sulfate

Dextran Sulfate

3.8

Dextran sulfate is a gentle film-forming ingredient that helps soothe and protect the skin, but its benefits are mostly surface-level.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Dibutyl Decyl IPDI

Dibutyl Decyl IPDI

3.5

A synthetic film-former that helps makeup and sunscreen stay put longer, especially in water or sweat.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dibutyl Fumarate Copolymer

DIBUTYL FUMARATE/HEXADECENE/TETRADECENE COPOLYMER

3.5

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dibutyl Maleate Copolymer

Dibutyl Maleate/Hexadecene/Tetradecene Copolymer

4.0

A synthetic film-former that boosts water resistance and wear time in makeup and sunscreens, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dibutylhexyl IPDI

Dibutylhexyl IPDI

3.5

A synthetic film-former that helps makeup and sunscreen stay put longer, but it's not a hydrating or active ingredient.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dicaprolactone Ethoxyacrylate Copolymer

DICAPROLACTONE ETHOXYACRYLATE/1,4-BUTANEDIOL/IPDI COPOLYMER

3.8

A synthetic film-former that helps makeup last longer and resist water, but may feel tight or heavy on very sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film-Former

Diethylaminoethyl Cellulose

DIETHYLAMINOETHYL CELLULOSE

4.0

A gentle film-forming polymer that helps products spread smoothly and create a light, flexible hold without heavy residue.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Diethylene Glycol Rosinate

DIETHYLENE GLYCOL ROSINATE

3.5

A pine-derived film former that helps makeup and sunscreens stay put, but may feel stiff or tacky on skin.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Diethylhexyl IPDI

Diethylhexyl IPDI

3.5

A synthetic film-former that helps sunscreen and makeup stay put longer, but it's not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dihydroxypropyl Hydrolyzed Casein

DIHYDROXYPROPYL HYDROLYZED CASEIN

3.8

A gentle, modified milk protein that forms a protective film on hair and skin to lock in moisture and smooth texture.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Dilinoleic Acid Copolymer

DILINOLEIC ACID/SEBACIC ACID/PIPERAZINE/ETHYLENEDIAMINE COPOLYMER

3.8

A synthetic polymer that helps makeup and sunscreen stay put longer, but offers no direct skin benefit beyond its film-forming function.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dilinoleic Acid/Glycol Copolymer

DILINOLEIC ACID/GLYCOL COPOLYMER

4.0

A gentle film-forming polymer that helps skincare and makeup stay put without clogging pores or irritating skin.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Dimer Dilinoleic Acid Copolymer

DIETHYLENE GLYCOL/HYDROGENATED DIMER DILINOLEIC ACID COPOLYMER

4.0

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dimer Dilinoleic Copolymer

Bis-Dioctadecylamide Dimer Dilinoleic Acid/Ethylenediamine Copolymer

3.8

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dimer Rosin

Dimer Rosin

3.5

Dimer Rosin is a modified tree resin that helps makeup and hair products stay put, but it may feel sticky or heavy on some skin types.

Irritation

low

Source

natural

beautyskincarefilm-former
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Film Former

Dimethicone Crosspolymer Blend

DIMETHICONE/VINYLTRIMETHYLSILOXYSILICATE CROSSPOLYMER

4.0

A gentle silicone powder that gives a silky finish and helps makeup stay put without clogging pores.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dimethicone PEG-8 Polyacrylate

Dimethicone PEG-8 Polyacrylate

3.8

A gentle silicone film-former that helps products feel silky and stay put, but may not suit those avoiding silicones.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Dimethicone/PPG-20 Crosspolymer

DIMETHICONE/PPG-20 CROSSPOLYMER

4.0

A silicone polymer that creates a smooth, breathable film on skin, improving product feel and longevity without clogging pores.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

Dimethiconol Beeswax

Dimethiconol Beeswax

4.0

A silicone-infused wax that gives products a silky, smooth feel without the heavy greasiness of traditional waxes.

Irritation

low

Source

semi-synthetic

beautyskincareemollientfilm-former
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