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

Emulsifier

PEG-16 Lanolin Alcohol Ether

PEG-16 Cetyl/Oleyl/Stearyl/Lanolin Alcohol Ether

3.5

A gentle emulsifier derived from lanolin that helps blend oil and water, but may be slightly comedogenic for acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-16 Macadamia Glycerides

PEG-16 Macadamia Glycerides

4.0

A gentle emulsifier that helps blend oil and water in your skincare, while also softening the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-16 Oleate

PEG-16 Oleate

3.5

PEG-16 Oleate is a safe, widely used emulsifier that helps products feel smooth and rinse cleanly, but it may not suit those avoiding synthetic ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emulsifier

PEG-16 Soy Sterol

PEG-16 SOY STEROL

4.0

A gentle, plant-based emulsifier that stabilizes formulas and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-16 Tallate

PEG-16 TALLATE

3.5

PEG-16 Tallate is a functional emulsifier that helps mix oil and water, but its PEG component and potential impurities raise mild safety considerations.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

PEG-160 Sorbitan Triisostearate

PEG-160 Sorbitan Triisostearate

3.8

A gentle, large-molecule emulsifier that stabilizes oil-and-water blends without significant irritation or clogging concerns.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Thickener

PEG-160M

PEG-160M

3.5

PEG-160M is a safe, synthetic thickener that improves product texture without causing irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincarethickener
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Emulsifier

PEG-17 Dimethicone

PEG-17 Dimethicone

4.0

A gentle silicone emulsifier that helps create smooth, spreadable textures without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-175 Diisostearate

PEG-175 Diisostearate

3.8

A reliable synthetic emulsifier that helps create stable, creamy textures, but may not suit those avoiding PEG compounds.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-175 Distearate

PEG-175 Distearate

4.0

A reliable synthetic emulsifier that stabilizes formulas without significant irritation or clogging concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-18 Castor Oil Dioleate

PEG-18 Castor Oil Dioleate

3.5

A common emulsifier that helps mix oil and water, but may be mildly irritating or clog pores for some skin types.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-18 Glyceryl Oleate/Cocoate

PEG-18 GLYCERYL OLEATE/COCOATE

3.8

A gentle, non-stripping surfactant that helps cleanse without over-drying, making it a good choice for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansingemulsifier
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Emulsifier

PEG-18 Palm Glycerides

PEG-18 Palm Glycerides

3.8

A gentle emulsifier that helps blend oil and water in products, with a low risk of irritation for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-18 Palmitate

PEG-18 Palmitate

3.5

A safe, effective emulsifier that helps mix oil and water in creams and cleansers, but may be less suitable for very sensitive skin due to potential mild irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-18 Stearate

PEG-18 Stearate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Film Former

PEG-180 Bispolylactide

PEG-180 Bispolylactide

3.5

A synthetic polymer that helps create a smooth, silky feel on skin and improves product spreadability.

Irritation

low

Source

synthetic

beautyskincaretexturizer
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Viscosity Controlling

PEG-180/Laureth-50/TMMG Copolymer

PEG-180/LAURETH-50/TMMG COPOLYMER

3.8

A synthetic thickener that helps give your cleansers and lotions a smooth, gel-like texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincarethickener
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Thickener

PEG-180M

PEG-180M

3.8

PEG-180M is a safe synthetic thickener that improves product texture and spreadability without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincarethickener
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Emulsifier

PEG-190 Distearate

PEG-190 Distearate

4.0

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Surfactant

PEG-192 Apricot Kernel Glycerides

PEG-192 APRICOT KERNEL GLYCERIDES

3.8

A gentle cleansing ingredient derived from apricot oil that helps water and oil mix, but its PEG component raises mild environmental and purity concerns.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emollient

PEG-2 Benzyl Ether

PEG-2 Benzyl Ether

3.5

A gentle synthetic ingredient that helps products feel smooth and spread easily, but offers no active skincare benefit on its own.

Irritation

low

Source

synthetic

beautyskincareemollient
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Surfactant

PEG-2 Caprylylamine

PEG-2 Caprylylamine

3.8

A mild synthetic surfactant that helps cleanse without stripping the skin, but may not suit ultra-sensitive types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-2 Castor Oil

PEG-2 Castor Oil

4.0

A gentle emulsifier that helps mix oil and water in skincare products, but may not suit those avoiding all PEG compounds.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

PEG-2 Cocamide

PEG-2 Cocamide

3.5

PEG-2 Cocamide is a common cleansing and emulsifying ingredient, but its moderate irritation potential means it's best suited for rinse-off products and may not be ideal for very sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-2 Cocamide Polyglyceryl-4 Ester

POLYGLYCERYL-4 PEG-2 COCAMIDE

4.0

A gentle, coconut-derived surfactant that helps cleanse without stripping the skin, but contains PEG compounds that some prefer to avoid.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-2 Cocamine

PEG-2 Cocamine

3.5

PEG-2 Cocamine is a mild surfactant and emulsifier that helps mix oils and water, but may cause irritation or clog pores in sensitive or acne-prone skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Antistatic Agent

PEG-2 Coco-Benzonium Chloride

PEG-2 Coco-Benzonium Chloride

3.5

A synthetic conditioning agent that reduces static and adds softness, but may cause irritation for sensitive skin or eyes.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Emollient

PEG-2 Diethylhexanoate

PEG-2 DIETHYLHEXANOATE

3.8

A synthetic emollient that helps products spread smoothly and leaves skin feeling soft without heavy greasiness.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

PEG-2 Diisononanoate

PEG-2 Diisononanoate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemollient
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Emulsifier

PEG-2 Diisostearate

PEG-2 Diisostearate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

PEG-2 Dilaurate

PEG-2 Dilaurate

3.8

A synthetic emollient that helps products feel smooth and spread easily, but may be moderately pore-clogging for some skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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