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

Emollient

PEG-9 Grapeseedate

PEG-9 GRAPESEEDATE

3.8

A gentle, semi-synthetic emollient that helps products spread smoothly and feel less greasy than pure oils.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

PEG-9 Isostearate

PEG-9 Isostearate

3.8

A reliable synthetic emulsifier that helps create stable, smooth creams and lotions, but may be too heavy for very oily or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-9 Laurate

PEG-9 Laurate

3.5

PEG-9 Laurate is a workhorse emulsifier that helps mix oil and water, but may cause irritation for sensitive skin in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Film Former

PEG-9 Methacrylate Polymer

POLY(METHOXY PEG-9 METHACRYLATE)

3.5

A synthetic polymer that helps products spread smoothly and feel silky, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefilm former
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Emollient

PEG-9 Octyldodecanoate

PEG-9 Octyldodecanoate

3.8

A gentle synthetic emollient that helps products feel smooth and spread easily, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Surfactant

PEG-9 Oleamide

PEG-9 OLEAMIDE

3.5

PEG-9 Oleamide is a synthetic emulsifier that helps mix oil and water in cleansers, but it may be mildly irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-9 Oleate

PEG-9 Oleate

3.5

PEG-9 Oleate is a workhorse emulsifier that helps mix oil and water, but it may be slightly drying or irritating for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-9 Oliveate

PEG-9 OLIVEATE

4.0

A mild, olive-derived emulsifier that helps cleanse without stripping the skin, but may not suit everyone due to its PEG component.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-9 Ricinoleate

PEG-9 Ricinoleate

3.8

PEG-9 Ricinoleate is a mild emulsifier that helps mix water and oil in cleansers and creams, but its PEG component raises minor purity concerns for some users.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-9 Soyate

PEG-9 Soyate

4.0

A gentle, plant-derived surfactant that helps cleanse without stripping the skin, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

PEG-90 Diisostearate

PEG-90 Diisostearate

3.8

A reliable synthetic emulsifier that helps blend oil and water, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-90 Glyceryl Isostearate

PEG-90 Glyceryl Isostearate

3.8

A reliable synthetic emulsifier that helps create smooth, stable formulas, but its PEG component raises mild environmental and purity concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Film Former

PEG-90 Polycaprolactone

PEG-90/POLYEPSILON CAPROLACTONE

3.5

A synthetic polymer that helps products spread smoothly and form a light, flexible film on skin, but offers no direct active benefits.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emulsifier

PEG-90 Stearate

PEG-90 Stearate

3.8

A reliable synthetic emulsifier that helps create smooth, stable creams and lotions, but may be too heavy for very oily or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Thickener

PEG-90M

PEG-90M

4.0

PEG-90M is a safe, synthetic thickener that gives a smooth, non-sticky feel to water-based products.

Irritation

low

Source

synthetic

beautyskincarethickener
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Film Former

PEG-Fluorinated Acrylate Copolymer

ACRYLATES/METHOXY PEG-23 METHACRYLATE/PERFLUOROOCTYL ETHYL ACRYLATE COPOLYMER

3.8

A synthetic film-former that helps makeup and sunscreen stay put, but its fluorinated chemistry raises environmental persistence concerns.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

PEG-Modified Silicone Polymer

ISOBUTYL/METHOXY PEG-10 POLYSILSESQUIOXANE

3.8

A synthetic silicone polymer that helps products spread smoothly and feel lightweight, but may not suit those avoiding silicones.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Antioxidant

PEG-X Bis-Tocopheryl Succinate

PEG-X BIS-(TOCOPHERYL SUCCINATE)

4.0

A stabilized form of vitamin E that offers antioxidant benefits with better formulation flexibility than plain tocopherol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Film Former

PEG/Polybutanediol Dimethyl Ether

PEG/POLY(1,2-BUTANEDIOL)-52/32 DIMETHYL ETHER

3.5

A synthetic polymer that helps products spread smoothly and form a light, flexible film on skin, but it offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Surfactant

PEG/PPG Alcohol Blend

PEG-4-PPG-7 C13/C15 Alcohol

3.5

A synthetic emulsifier that helps mix oil and water, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Film Former

PEG/PPG Copolymer Film Former

PHTHALIC ANHYDRIDE/ADIPIC ACID/CASTOR OIL/NEOPENTYL GLYCOL/PEG-3/TRIMETHYLOLPROPANE COPOLYMER

3.8

A synthetic film former that helps makeup and sunscreen stay put, but its long-chain polymer structure means it's not easily absorbed and may feel heavy on some skin types.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emulsifier

PEG/PPG Dimethicone Copolymer

PEG/PPG-24/24 Methyl Ether Glycidoxy Dimethicone

3.8

A silicone emulsifier that helps mix water and oil for a smooth, spreadable texture, but may not suit those avoiding silicones.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Film Former

PEG/PPG SMDI Copolymer

BIS-METHOXY PEG-13 PEG-438/PPG-110 SMDI COPOLYMER

4.0

A synthetic polymer that helps products spread smoothly and resist water, but may feel heavy on some skin types.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Antioxidant

PEG/PPG Tocopheryl Ether

PEG/PPG-100/70 Tocopheryl Ether

4.0

A water-friendly version of vitamin E that helps protect skin from environmental damage and keeps it feeling soft.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Humectant

PEG/PPG-1/2 Copolymer

PEG/PPG-1/2 Copolymer

3.8

A gentle synthetic humectant that helps hydrate skin and improve product texture, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Antistatic Agent

PEG/PPG-1/25 Diethylmonium Chloride

PEG/PPG-1/25 Diethylmonium Chloride

3.5

A synthetic conditioning ingredient that helps reduce static and improve the feel of hair and skin, but may not suit those avoiding PEGs.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Humectant

PEG/PPG-10/2 Copolymer

PEG/PPG-10/2 Copolymer

4.0

A gentle, water-binding polymer that helps keep skin hydrated and smooth without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emulsifier

PEG/PPG-10/2 Dimethicone

PEG/PPG-10/2 Dimethicone

4.0

A gentle silicone emulsifier that improves product texture and spreadability without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG/PPG-10/2 Diricinoleate

PEG/PPG-10/2 Diricinoleate

3.8

A reliable synthetic emulsifier that helps mix oil and water in formulas, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG/PPG-10/2 Ricinoleate

PEG/PPG-10/2 Ricinoleate

3.8

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Thickener

PEG/PPG-10/30 Copolymer

PEG/PPG-10/30 Copolymer

4.0

A safe, synthetic thickener that improves product texture without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincarethickener
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Humectant

PEG/PPG-10/65 Copolymer

PEG/PPG-10/65 Copolymer

3.8

A gentle synthetic polymer that helps products feel silky and spread smoothly, while also providing light hydration.

Irritation

low

Source

synthetic

beautyskincareemollienthumectant
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Humectant

PEG/PPG-10/70 Copolymer

PEG/PPG-10/70 Copolymer

4.0

A gentle, water-attracting polymer that helps hydrate skin and improve product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emulsifier

PEG/PPG-12/16 Dimethicone

PEG/PPG-12/16 Dimethicone

4.0

A gentle silicone emulsifier that improves texture and helps ingredients mix, but may not suit those avoiding silicones.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Film Former

PEG/PPG-12/35 Copolymer

PEG/PPG-12/35 Copolymer

4.0

A gentle synthetic polymer that helps products feel silky and spread evenly without clogging pores.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Viscosity Controlling

PEG/PPG-125/30 Copolymer

PEG/PPG-125/30 Copolymer

4.0

A gentle synthetic thickener that gives water-based products a smooth, non-sticky feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Emulsifier

PEG/PPG-14/2 Propylheptyl Ether

PEG/PPG-14/2 Propylheptyl Ether

3.8

A synthetic emulsifier that helps mix oil and water in products, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emulsifier

PEG/PPG-14/4 Dimethicone

PEG/PPG-14/4 Dimethicone

3.8

A versatile silicone emulsifier that improves texture and spreadability with a low risk of irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

PEG/PPG-15/15 Acetate

PEG/PPG-15/15 Acetate

3.5

A safe, synthetic emollient that helps products feel silky and spread easily, but offers no active skin benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

PEG/PPG-15/15 Acetate Dimethicone

PEG/PPG-15/15 Acetate Dimethicone

4.0

A gentle silicone that gives skin and hair a silky, smooth feel without clogging pores, but may not be ideal for those avoiding silicones.

Irritation

low

Source

synthetic

beautyskincarehaircareemollient
Read ingredient review

Emulsifier

PEG/PPG-15/15 Dimethicone

PEG/PPG-15/15 Dimethicone

4.0

A silicone emulsifier that helps create smooth, lightweight textures and improves product spreadability without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG/PPG-15/5 Dimethicone

PEG/PPG-15/5 Dimethicone

4.0

A versatile silicone emulsifier that improves product texture and spreadability with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Thickener

PEG/PPG-150/30 Copolymer

PEG/PPG-150/30 Copolymer

3.8

A safe, synthetic thickener that gives water-based products a silky, non-sticky feel, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Thickener

PEG/PPG-150/35 Copolymer

PEG/PPG-150/35 COPOLYMER

3.8

A safe, synthetic thickener that helps create a smooth, spreadable texture in cleansers and lotions, but offers no active skin benefits.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Humectant

PEG/PPG-16/17 Copolymer

PEG/PPG-16/17 Copolymer

3.8

A gentle synthetic ingredient that helps products feel silky and spread evenly without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

PEG/PPG-16/2 Dimethicone

PEG/PPG-16/2 Dimethicone

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG/PPG-16/8 Dimethicone

PEG/PPG-16/8 Dimethicone

4.0

A gentle silicone emulsifier that helps create smooth, stable formulas without heavy residue.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review