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 20,303
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

Emollient

Bis-Capryloyloxypalmitamido Isopropanol

BIS-CAPRYLOYLOXYPALMITAMIDO ISOPROPANOL

3.5

A synthetic emollient that helps improve skin feel and may support the delivery of other ingredients, but research on its specific benefits is limited.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emulsifier

Bis-Carboxydecyl Dimethicone

Bis-Carboxydecyl Dimethicone

4.0

A gentle silicone emulsifier that stabilizes formulas and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

Bis-Cetyl Cetyl Dimethicone

Bis-Cetyl Cetyl Dimethicone

4.0

A gentle silicone emollient that improves product feel and spreadability with a very low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Skin conditioning agent

Bis-Coumaramido Propane

Bis-Coumaramido Propane

3.8

A synthetic ingredient that may help improve skin firmness and smooth fine lines, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Skin conditioning agent

Bis-Coumaramidobutane

Bis-Coumaramidobutane

3.8

Bis-Coumaramidobutane is a synthetic ingredient that may help improve skin firmness and reduce wrinkle depth, but research is still emerging and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Soothing Agent

Bis-Dihydroxycinnamido Propane

Bis-Dihydroxycinnamido Propane

4.0

A gentle, synthetic ingredient that helps calm redness and support a healthy skin barrier, making it a good choice for sensitive or reactive skin.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
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Film Former

Bis-Dimethicone

Bis-Dimethicone

4.0

A gentle silicone that helps products glide on smoothly and lock in moisture without clogging pores.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

Bis-Diphenylethyl Disiloxane

BIS-DIPHENYLETHYL DISILOXANE

4.0

A lightweight silicone that makes products feel silky and spread easily, with a very low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincaresilicone
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Emollient

Bis-Ethoxydiglycol Succinate

BIS-ETHOXYDIGLYCOL SUCCINATE

3.8

A gentle synthetic emollient that helps products feel silky and spread easily, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Bis-Ethyl Ethyl Methicone

BIS-ETHYL ETHYL METHICONE

4.2

A gentle silicone that helps products glide on smoothly without clogging pores, making it a good choice for oily or sensitive skin.

Irritation

low

Source

synthetic

beautyskincaresilicone
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Antioxidant

Bis-Ferulamidobutane

Bis-Ferulamidobutane

4.0

A stable, synthetic antioxidant that may help protect skin from environmental damage and support a more even tone.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Antioxidant

Bis-Glyceryl Ascorbate

BIS-GLYCERYL ASCORBATE

4.3

A gentle, stable vitamin C derivative that brightens skin and fights free radicals without the irritation of pure L-ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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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
Read ingredient review

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
Read ingredient review