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

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

Viscosity controlling agent

PEG/PPG-160/30 Copolymer

PEG/PPG-160/30 Copolymer

3.8

A safe, synthetic thickener that helps create smooth, non-sticky gels and serums, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Thickener

PEG/PPG-160/31 Copolymer

PEG/PPG-160/31 Copolymer

3.8

A safe, synthetic thickener that improves product texture and spreadability without common irritation.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Emulsifier

PEG/PPG-17/18 Dimethicone

PEG/PPG-17/18 Dimethicone

4.0

A gentle silicone emulsifier that helps blend water and oil ingredients while leaving a smooth, non-sticky feel on skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Solvent

PEG/PPG-17/4 Dimethyl Ether

PEG/PPG-17/4 Dimethyl Ether

4.0

A gentle, water-soluble polymer that helps other ingredients absorb better and leaves skin feeling smooth without stickiness.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Humectant

PEG/PPG-17/6 Copolymer

PEG/PPG-17/6 Copolymer

4.0

A gentle, water-attracting polymer that helps products feel smooth and spread easily without irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Emulsifier

PEG/PPG-18/12 Dimethicone

PEG/PPG-18/12 Dimethicone

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG/PPG-18/18 Dimethicone

PEG/PPG-18/18 Dimethicone

4.0

A gentle silicone emulsifier that improves product texture and helps ingredients mix without causing irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG/PPG-18/18 Isostearate

PEG/PPG-18/18 Isostearate

3.5

A safe, effective emulsifier that helps mix water and oil in your products, but it's synthetic and may not suit those avoiding PEGs.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG/PPG-18/18 Laurate

PEG/PPG-18/18 Laurate

3.5

A reliable synthetic emulsifier that helps mix water and oil in products, but may not suit those avoiding PEGs.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Texture Enhancer

PEG/PPG-18/4 Copolymer

PEG/PPG-18/4 Copolymer

3.8

A versatile synthetic polymer that improves product feel and spreadability without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Emulsifier

PEG/PPG-18/6 Dimethicone

PEG/PPG-18/6 Dimethicone

4.0

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

PEG/PPG-19/21 Copolymer

PEG/PPG-19/21 Copolymer

3.8

A gentle synthetic polymer that helps products feel smooth and spread easily without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Thickener

PEG/PPG-190/60 Copolymer

PEG/PPG-190/60 Copolymer

3.8

A safe, synthetic thickener and stabilizer that improves product texture without major skin concerns.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Antioxidant

PEG/PPG-2/5 Tocopheryl Ether

PEG/PPG-2/5 Tocopheryl Ether

4.0

A gentle, modified vitamin E that provides antioxidant protection and skin conditioning with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Emulsifier

PEG/PPG-20/15 Dimethicone

PEG/PPG-20/15 Dimethicone

4.0

A versatile silicone emulsifier that helps blend water and oil phases for a smooth, silky texture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG/PPG-20/20 Copolymer

PEG/PPG-20/20 Copolymer

3.8

A gentle synthetic polymer that helps blend oil and water in formulas, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG/PPG-20/20 Dimethicone

PEG/PPG-20/20 Dimethicone

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG/PPG-20/23 Dimethicone

PEG/PPG-20/23 Dimethicone

4.0

A versatile silicone emulsifier that helps create smooth, spreadable formulas without greasiness, but may not suit those avoiding silicones.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG/PPG-20/29 Dimethicone

PEG/PPG-20/29 Dimethicone

4.0

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG/PPG-20/6 Dimethicone

PEG/PPG-20/6 Dimethicone

4.0

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Thickener

PEG/PPG-20/60 Copolymer

PEG/PPG-20/60 Copolymer

3.8

A safe, synthetic thickener that improves product texture and stability without common irritation.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Viscosity Controlling

PEG/PPG-20/65 Copolymer

PEG/PPG-20/65 Copolymer

3.8

A safe, synthetic thickener that improves product texture and stability without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Humectant

PEG/PPG-20/9 Copolymer

PEG/PPG-20/9 Copolymer

4.0

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

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Thickener

PEG/PPG-200/40 Copolymer

PEG/PPG-200/40 Copolymer

3.8

A safe, synthetic thickener that improves product texture and spreadability without clogging pores.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Viscosity controlling agent

PEG/PPG-200/70 Copolymer

PEG/PPG-200/70 COPOLYMER

3.8

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

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Thickener

PEG/PPG-2000/200 Copolymer

PEG/PPG-2000/200 Copolymer

3.8

A safe, synthetic thickener that improves product texture and stability without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Emulsifier

PEG/PPG-22/23 Dimethicone

PEG/PPG-22/23 Dimethicone

4.0

A gentle silicone emulsifier that helps create smooth, spreadable formulas without heavy greasiness.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG/PPG-22/24 Dimethicone

PEG/PPG-22/24 Dimethicone

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Film Former

PEG/PPG-22/25 Copolymer

PEG/PPG-22/25 Copolymer

4.0

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Thickener

PEG/PPG-23/17 Copolymer

PEG/PPG-23/17 COPOLYMER

3.8

A safe, synthetic thickener that improves product texture and spreadability, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Thickener

PEG/PPG-23/50 Copolymer

PEG/PPG-23/50 Copolymer

3.8

A safe, synthetic thickener that improves product texture and spreadability, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarethickener
Read ingredient review

Emulsifier

PEG/PPG-23/6 Dimethicone

PEG/PPG-23/6 Dimethicone

4.0

A gentle silicone emulsifier that improves texture and spreadability without clogging pores or causing irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review