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 20,769
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

Bis-HEA Polycaprolactone Diol/HDI Copolymer

BIS-HEA POLYCAPROLACTONE DIOL/HDI COPOLYMER

4.0

A gentle synthetic polymer that forms a flexible, breathable film to improve product wear, water resistance, and skin feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm-former
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Film Former

Bis-HEA Polycarbonate/IPDI Copolymer

BIS-HEA POLY(HEXAMETHYLENE/METHYLPENTYLENE CARBONATE)/IPDI COPOLYMER

3.8

A synthetic film-former that helps makeup and sunscreen stay put without feeling overly stiff or sticky.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

Bis-HEMA Copolymer

BIS-HEMA POLYNEOPENTYL GLYCOL ADIPATE/IPDI COPOLYMER

4.0

A synthetic film-former that helps makeup and sunscreen stay put longer without feeling heavy.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Bis-HEMA IPDI

BIS-HEMA IPDI

3.5

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Bis-HEMA Polycaprolactone Copolymer

BIS-HEMA POLY(CAPROLACTONE NEOPENTYL GLYCOL)/IPDI COPOLYMER

3.8

A synthetic film-former that helps makeup and skincare stay put, resist water, and feel flexible on skin.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Bis-HEMA Polyurethane Copolymer

BIS-HEMA POLY(1,4-BUTANEDIOL)-14/PEG-2/PPG-3/IPDI COPOLYMER

3.8

A synthetic film-former that helps makeup and sunscreen stay put without feeling heavy or sticky.

Irritation

low

Source

synthetic

beautyskincarehaircare
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pH Adjuster

Bis-Hexamethylene Triamine

BIS(HEXAMETHYLENE)TRIAMINE

3.0

Bis-hexamethylene triamine is a synthetic pH adjuster that helps keep formulas stable, but it can be irritating for sensitive skin at higher levels.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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Surfactant

Bis-Hexyldioxodecyl Methyl Lysinate

BIS-HEXYLDIOXODECYL METHYL LYSINATE

4.0

A mild, amino-acid-based surfactant that cleanses without stripping the skin barrier — a good choice for sensitive or dry skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Film Former

Bis-HPMA Polyurethane Copolymer

BIS-HPMA POLY(1,4-BUTANEDIOL)-9/TMDI COPOLYMER

3.8

A synthetic film-former that helps makeup and hair products resist water and humidity, but may feel stiff or heavy on some.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antioxidant

Bis-Hydroxybenzyl Sulfide

Bis-Hydroxybenzyl Sulfide

3.8

A synthetic antioxidant that may help shield skin from pollution and UV damage, but research is still limited compared to more established antioxidants like vitamin C or E.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Film Former

Bis-Hydroxyethoxypropyl Dimethicone

Bis-Hydroxyethoxypropyl Dimethicone

4.0

A gentle silicone that gives skin a silky, smooth feel without clogging pores, commonly used to improve product texture and spreadability.

Irritation

low

Source

synthetic

beautyskincaresilicone
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Antistatic Agent

Bis-Hydroxyethyl Cocomonium Nitrate

Bis-Hydroxyethyl Cocomonium Nitrate

3.8

A gentle, coconut-derived conditioner that reduces static and improves combability, suitable for most hair types.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Antistatic agent

Bis-Hydroxyethyl Rapeseedmonium Chloride

BIS-HYDROXYETHYL RAPESEEDMONIUM CHLORIDE

4.0

A mild, plant-derived conditioning ingredient that reduces static and adds softness, suitable for most hair types including sensitive scalps.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Bis-Hydroxyethyl Tallowmonium Chloride

Bis-Hydroxyethyl Tallowmonium Chloride

3.5

Effective for detangling and softening hair, but may cause irritation or buildup for sensitive scalps or fine hair.

Irritation

moderate

Source

semi-synthetic

beautyhaircareconditioning agent
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pH Adjuster

Bis-Hydroxyethyl Tromethamine

BIS-HYDROXYETHYL TROMETHAMINE

4.0

A gentle pH adjuster that helps keep your skincare products stable and comfortable on skin without causing irritation.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
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Emollient

Bis-Hydroxypropyl Dimethicone

Bis-Hydroxypropyl Dimethicone

4.0

A gentle silicone that improves product feel and skin softness, widely considered safe and non-irritating for most skin types.

Irritation

low

Source

synthetic

beautyskincaresilicone
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Crosslinking Agent

Bis-Isocyanatomethyl Cyclohexane

1,3-BIS-(ISOCYANATOMETHYL) CYCLOHEXANE

1.0

This is an industrial chemical used in nail coatings, not a skincare ingredient; it poses significant irritation and sensitization risks and is not recommended for leave-on skin products.

Irritation

high

Source

synthetic

beautynail-careindustrial
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Antistatic Agent

Bis-Lauryldimonium Hydroxyethyl Bromide Copolymer

BIS-LAURYLDIMONIUMHYDROXYETHYL BROMIDE (PEG-220/SMDI COPOLYMER)

3.8

A gentle conditioning polymer that helps reduce frizz and static while improving the feel of hair and skin, but its complex name can be intimidating.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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