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

Emulsifier

PEG-2 Dioleate

PEG-2 Dioleate

3.8

A reliable emulsifier that helps mix water and oil, but may be slightly pore-clogging for acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-2 Dirosinate

PEG-2 Dirosinate

3.5

A synthetic emulsifier that helps mix oil and water in products, generally considered safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-2 Distearate

PEG-2 Distearate

3.8

A reliable synthetic emulsifier that helps blend oil and water in creams and lotions, but may be slightly pore-clogging for acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-2 Hydrogenated Castor Oil

PEG-2 HYDROGENATED CASTOR OIL

3.8

A gentle emulsifier that helps mix oil and water, generally safe for most skin types but may be too heavy for very oily skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

PEG-2 Hydrogenated Tallow Amine

PEG-2 Hydrogenated Tallow Amine

3.5

A synthetic emulsifier that helps mix oil and water, but may be mildly irritating for sensitive skin and has moderate comedogenic potential.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-2 Isostearate

PEG-2 Isostearate

3.5

PEG-2 Isostearate is a gentle synthetic emulsifier that helps mix water and oil in creams and lotions, but it may not suit those avoiding all PEG compounds.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-2 Lauramide

PEG-2 Lauramide

3.8

PEG-2 Lauramide is a synthetic ingredient that helps cleansers foam and mix oil with water, but it may be mildly irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-2 Lauramine

PEG-2 Lauramine

3.5

An effective cleansing agent, but may be too stripping for dry or sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-2 Laurate

PEG-2 Laurate

3.5

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-2 Laurate SE

PEG-2 Laurate SE

3.5

PEG-2 Laurate SE helps mix oil and water in creams and cleansers, but may be slightly irritating or pore-clogging for sensitive or acne-prone skin.

Irritation

moderate

Source

semi-synthetic

beautyskincareemulsifier
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Skin Conditioner

PEG-2 Milk Solids

PEG-2 Milk Solids

3.5

A gentle, semi-synthetic ingredient that combines milk solids with PEG to improve skin feel and product texture, but may not suit those avoiding PEGs or animal-derived ingredients.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Surfactant

PEG-2 Oleamine

PEG-2 OLEAMINE

3.5

PEG-2 Oleamine helps mix oil and water in cleansers, but may be mildly irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-2 Oleamine Hydrofluoride

PEG-2 OLEAMINE HYDROFLUORIDE

3.5

A synthetic fluoride compound used in oral care to help prevent cavities, but it may cause irritation in sensitive mouths.

Irritation

moderate

Source

synthetic

beautyoral caresurfactant
Read ingredient review

Antistatic Agent

PEG-2 Oleammonium Chloride

PEG-2 OLEAMMONIUM CHLORIDE

3.5

PEG-2 Oleammonium Chloride is a synthetic conditioning agent that reduces static and softens hair, but it may cause irritation for sensitive skin or clog pores in acne-prone individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

PEG-2 Oleate

PEG-2 Oleate

3.5

PEG-2 Oleate is a mild synthetic emulsifier that helps blend oil and water in cleansers and creams, but it may be less common in modern formulations due to concerns about ethoxylation byproducts.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-2 Oleate SE

PEG-2 Oleate SE

3.5

A reliable emulsifier for oil-and-water blends, but may be too rich for acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-2 Olive Glycerides

PEG-2 OLIVE GLYCERIDES

4.0

A gentle, olive-derived emulsifier that helps blend oil and water in skincare formulas without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

PEG-2 Phenyl Ether

PEG-2 Phenyl Ether

3.8

A gentle synthetic ingredient that helps products spread smoothly and feel less greasy, but offers no active skin benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Surfactant

PEG-2 Rapeseedamine

PEG-2 RAPESEEDAMINE

3.5

A gentle conditioning ingredient from rapeseed oil that helps soften hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

PEG-2 Ricinoleate

PEG-2 Ricinoleate

3.8

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-2 Sorbitan Trioleate

PEG-2 Sorbitan Trioleate

3.8

A gentle synthetic emulsifier that helps mix water and oil in creams and lotions, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-2 Soyamine

PEG-2 SOYAMINE

3.5

PEG-2 Soyamine is an effective emulsifier and surfactant, but it may cause irritation or clog pores for some skin types, especially in leave-on products.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-2 Stearamide Carboxylic Acid

PEG-2 Stearamide Carboxylic Acid

4.0

A gentle, PEG-modified surfactant that helps create a rich foam while being less stripping than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
Read ingredient review

Antistatic Agent

PEG-2 Stearamine

PEG-2 Stearamine

3.8

PEG-2 Stearamine is a synthetic ingredient that helps hair feel soft and reduces static, but it may be mildly irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

PEG-2 Stearate

PEG-2 Stearate

3.8

PEG-2 Stearate is a reliable emulsifier that keeps creams and lotions stable, but it may be moderately comedogenic for acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-2 Stearate SE

PEG-2 Stearate SE

3.8

A reliable emulsifier that helps create stable, creamy textures, but may be slightly pore-clogging for some skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Antistatic Agent

PEG-2 Stearmonium Chloride

PEG-2 Stearmonium Chloride

3.8

A synthetic conditioning agent that reduces static and softens hair, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

PEG-2 Sunflower Glycerides

PEG-2 Sunflower Glycerides

4.0

A gentle, sunflower-derived emulsifier that helps blend oil and water in skincare products while adding a light, non-greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-2 Tallow Amine

PEG-2 TALLOW AMINE

3.5

PEG-2 Tallow Amine is an effective emulsifier and conditioning agent, but its animal-derived origin and potential for irritation make it less common in modern skincare.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-2 Tallowamide DEA

PEG-2 TALLOWAMIDE DEA

3.2

An effective foam booster and thickener, but may cause irritation for sensitive skin and raises ethical concerns due to animal-derived tallow.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-20 Almond Glycerides

PEG-20 Almond Glycerides

4.0

A mild, almond-derived emulsifier that helps create stable, creamy formulas without heavy greasiness.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Castor Oil

PEG-20 Castor Oil

3.8

PEG-20 Castor Oil helps mix oil and water in cleansers and shampoos, but may be irritating for sensitive or acne-prone skin.

Irritation

moderate

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-20 Cocamide

PEG-20 Cocamide

3.5

A common cleansing agent that helps foam and lift dirt, but may be too stripping for dry or sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

PEG-20 Cocamide MEA

PEG-20 Cocamide MEA

3.5

A common foaming agent that helps cleansers lather and remove oil, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-20 Cocamine

PEG-20 Cocamine

3.5

PEG-20 Cocamine is a workhorse emulsifier and surfactant, but it may be too harsh for sensitive or acne-prone skin and raises environmental concerns due to its PEG and amine components.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-20 Corn Glycerides

PEG-20 Corn Glycerides

4.0

A gentle, plant-derived emulsifier that helps blend oil and water in skincare formulas without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Dilaurate

PEG-20 Dilaurate

3.5

PEG-20 Dilaurate is a safe, widely used emulsifier that helps mix water and oil in skincare products, but its PEG component raises minor purity concerns for sensitive skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Dioleate

PEG-20 Dioleate

3.8

A reliable synthetic emulsifier that helps mix water and oil, but may be too heavy for very oily or acne-prone skin in high concentrations.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Diricinoleate

PEG-20 Diricinoleate

4.0

A gentle synthetic emulsifier that helps mix oil and water in cleansers and creams, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-20 Distearate

PEG-20 Distearate

3.8

PEG-20 Distearate is a reliable emulsifier that keeps your lotions and creams from separating, but it's synthetic and may not appeal to those seeking natural ingredients.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Evening Primrose Glycerides

PEG-20 Evening Primrose Glycerides

4.0

A gentle, semi-synthetic emulsifier that helps blend oil and water in creams and lotions while providing light skin conditioning.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Glyceryl Laurate

PEG-20 Glyceryl Laurate

4.0

A gentle emulsifier that helps create stable, creamy formulas without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Glyceryl Oleate

PEG-20 Glyceryl Oleate

4.0

A gentle emulsifier that helps cleansers remove dirt and oil without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Glyceryl Ricinoleate

PEG-20 Glyceryl Ricinoleate

3.5

A gentle emulsifier that helps mix oil and water in cleansers and creams, but may be drying for very sensitive skin in high concentrations.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Glyceryl Stearate

PEG-20 Glyceryl Stearate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Glyceryl Triisostearate

PEG-20 Glyceryl Triisostearate

4.0

A reliable synthetic emulsifier that helps create smooth, stable lotions and creams without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Glyceryl Trioleate

PEG-20 Glyceryl Trioleate

3.8

A reliable synthetic emulsifier that helps create stable, creamy formulas, but may raise concerns for those avoiding PEG compounds.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Hexadecenylsuccinate

PEG-20 Hexadecenylsuccinate

3.5

A safe, effective emulsifier that helps oil and water mix, but it's synthetic and may not appeal to those seeking natural ingredients.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-20 Hydrogenated Castor Oil

PEG-20 Hydrogenated Castor Oil

4.0

A gentle, plant-based emulsifier that helps mix oil and water in your skincare, but may feel slightly heavy on very oily skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review