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

Surfactant

C20-22 Alkyl Glucoside

C20-22 Alkyl Glucoside

4.5

A gentle, non-stripping surfactant that cleanses without disrupting the skin barrier, ideal for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Emulsifier

C20-22 Alkyl Phosphate

C20-22 Alkyl Phosphate

4.0

A gentle synthetic emulsifier that helps mix oil and water in your products without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

C20-22 Pareth-30

C20-22 PARETH-30

4.0

A gentle synthetic emulsifier that helps mix oil and water, commonly used in cleansers and creams with a low irritation profile.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

C20-24 Alkyl Dimethicone

C20-24 ALKYL DIMETHICONE

4.0

A gentle silicone emollient that gives a silky, non-greasy feel and helps products glide on smoothly, with a very low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C20-24 Alkyl Methicone

C20-24 ALKYL METHICONE

4.0

A gentle silicone emollient that smooths skin and improves product feel without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C20-24 Olefin

C20-24 Olefin

3.5

C20-24 Olefin is a synthetic emollient that helps products feel smooth and spread easily, with a very low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Film Former

C20-28 Polyolefin

POLY(C20-28 OLEFIN)

4.0

A safe, synthetic film-former that helps makeup and skincare last longer and feel smoother on skin.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

C20-30 Glycol

C20-30 Glycol

4.0

A gentle emollient that helps soften skin and improve product texture without common irritation or clogging.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

C20-30 Glycol Isostearate

C20-30 GLYCOL ISOSTEARATE

4.0

A reliable synthetic emulsifier that helps create smooth, stable creams and lotions with a pleasant feel.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

C20-40 Alcohols

C20-40 Alcohols

4.0

A safe, non-drying fatty alcohol that helps thicken and stabilize creams and lotions without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollientthickener
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Viscosity Controlling

C20-40 Alkyl Behenate

C20-40 ALKYL BEHENATE

4.0

A gentle synthetic wax that gives lip and stick products a smooth, creamy texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C20-40 Alkyl Stearate

C20-40 Alkyl Stearate

4.0

A gentle, waxy emollient that improves product texture and skin feel without common irritation or clogging concerns.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C20-40 Isoparaffin

C20-40 Isoparaffin

3.8

A gentle, non-greasy emollient that helps products spread smoothly and feel lightweight on the skin.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emulsifier

C20-40 Pareth-10

C20-40 PARETH-10

3.8

A gentle synthetic emulsifier that helps keep your skincare products stable and well-mixed, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emulsifier

C20-40 Pareth-24

C20-40 PARETH-24

4.0

A gentle synthetic emulsifier that helps mix oil and water in your products, with a low risk of irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

C20-40 Pareth-3

C20-40 Pareth-3

3.8

A gentle synthetic emulsifier that helps water and oil mix in your products, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

C20-40 Pareth-40

C20-40 PARETH-40

4.0

A gentle synthetic emulsifier that helps create stable, creamy formulas without common irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

C20-40 Pareth-95

C20-40 PARETH-95

3.5

A gentle synthetic emulsifier that helps mix water and oil in creams and lotions, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

C21-28 Alkane

C21-28 Alkane

4.0

A gentle, plant-derived emollient that provides a silky, non-greasy feel — great for sensitive or oily skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C21-C28 Alkane

C21-C28 Alkane

4.3

A gentle, plant-derived emollient that provides a silky feel without clogging pores or causing irritation.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emulsifier

C22-24 Pareth-33

C22-24 PARETH-33

4.0

A gentle synthetic emulsifier that helps create stable, creamy textures without common irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

C24-28 Alkyl Dimethicone

C24-28 Alkyl Dimethicone

4.2

A gentle silicone that smooths and softens skin without clogging pores, ideal for dry or sensitive types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C24-28 Olefin

C24-28 OLEFIN

3.5

A synthetic emollient that helps products glide on smoothly without feeling greasy, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C24-30 Olefin

C24-30 Olefin

3.5

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

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C26-28 Alkyl Methicone

C26-28 ALKYL METHICONE

4.0

A gentle silicone emollient that leaves skin feeling smooth and silky without clogging pores, ideal for improving product texture.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C26-54 Olefin

C26-54 OLEFIN

3.8

A safe, non-greasy emollient that helps products spread smoothly and feel silky on the skin.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C28-36 Olefin

C28-36 OLEFIN

4.0

A gentle, non-greasy emollient that softens skin and improves product feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C30-45 Alkyl Dimethicone

C30-45 Alkyl Dimethicone

4.0

A gentle silicone that helps products glide on smoothly and leaves skin feeling soft without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C30-45 Alkyl Methicone

C30-45 Alkyl Methicone

4.3

A gentle, non-greasy silicone that smooths skin and helps products glide on effortlessly — generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C30-45 Olefin

C30-45 OLEFIN

3.5

A gentle, non-greasy emollient that helps products spread smoothly and leaves skin feeling soft without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C30-50 Alkyl Beeswax

C30-50 ALKYL BEESWAX

4.0

A gentle, synthetic wax that improves product texture and stability without the variability of natural beeswax.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

C30-50 Alkyl Stearate

C30-50 ALKYL STEARATE

4.0

A gentle, non-greasy wax ester that helps skincare and makeup feel smooth and stay put without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

C30-50 Alkyl/Octyldodecyl Citrate

C30-50 ALKYL/OCTYLDODECYL CITRATE

4.0

A gentle, non-greasy emollient that improves product feel and skin softness with a very low risk of irritation or clogged pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Surfactant

C30-50 Pareth-10

C30-50 PARETH-10

4.0

A mild, large-molecule surfactant that cleanses without stripping the skin barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Emulsifier

C30-50 Pareth-3

C30-50 PARETH-3

4.0

A gentle synthetic emulsifier that helps mix water and oil in creams and lotions, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

C30-50 Pareth-40

C30-50 Pareth-40

4.0

A gentle, high-molecular-weight emulsifier that helps blend water and oil in creams and lotions without significant irritation or clogging concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

C32 Alkyl Dimethicone

C32 Alkyl Dimethicone

4.2

C32 Alkyl Dimethicone is a gentle silicone emollient that helps products glide on smoothly and leaves skin feeling soft without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C32-36 Isoalkyl Acid

C32-36 ISOALKYL ACID

3.8

A gentle, synthetic fatty acid blend that helps soften and smooth skin without clogging pores, making it a safe choice for most skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C32-36 Isoalkyl Stearate

C32-36 ISOALKYL STEARATE

4.0

A gentle, synthetic emollient that provides a silky feel without clogging pores, making it a good option for sensitive and oily skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Film Former

C4-14 Perfluoroalkylethoxy Dimethicone

C4-14 PERFLUOROALKYLETHOXY DIMETHICONE

3.5

A synthetic film-former that helps products resist water and sweat, but its perfluoroalkyl structure raises environmental persistence concerns.

Irritation

low

Source

synthetic

beautyskincarefilm former
Read ingredient review

Emollient

C4-5 Isoalkyl Cocoate

C4-5 Isoalkyl Cocoate

4.0

A lightweight, coconut-derived emollient that softens skin without clogging pores, making it a good choice for oily or combination skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C40-60 Alcohols

C40-60 Alcohols

4.0

A gentle, non-irritating wax-like ingredient that helps thicken and stabilize products without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

C40-60 Alkyl Stearate

C40-60 Alkyl Stearate

4.0

A gentle, non-greasy wax ester that gives products a smooth, silky feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review