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-15 Castor Oil

PEG-15 Castor Oil

3.8

PEG-15 Castor Oil is a gentle emulsifier that helps mix water and oil in cleansers, but its PEG component raises mild environmental and purity concerns.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-15 Cocamine

PEG-15 Cocamine

3.5

PEG-15 Cocamine helps mix oil and water and reduces static in hair, but may be mildly irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-15 Cocamine Oleate/Phosphate

PEG-15 COCAMINE OLEATE/PHOSPHATE

3.5

An effective cleansing agent but may be drying or irritating for sensitive skin, especially in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Emulsifier

PEG-15 Cocoate

PEG-15 COCOATE

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Surfactant

PEG-15 Cocomonium Methosulfate

PEG-15 Cocomonium Methosulfate

3.8

A gentle surfactant that cleanses without stripping, often used to soften the feel of stronger cleansers.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

PEG-15 Cocopolyamine

PEG-15 Cocopolyamine

3.5

PEG-15 Cocopolyamine is a synthetic surfactant that helps cleanse and reduce static in hair, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Preservative Booster

PEG-15 DEDM Hydantoin

PEG-15 DEDM Hydantoin

3.5

A synthetic preservative booster that helps prevent microbial growth but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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Emulsifier

PEG-15 Glyceryl Diisostearate

PEG-15 Glyceryl Diisostearate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-15 Glyceryl Isostearate

PEG-15 Glyceryl Isostearate

3.8

A reliable synthetic emulsifier that helps create stable, creamy formulas, but may not suit those avoiding PEGs.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-15 Glyceryl Laurate

PEG-15 Glyceryl Laurate

3.8

A gentle synthetic emulsifier that helps mix water and oil, generally well-tolerated but best for rinse-off products due to potential residue.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-15 Glyceryl Oleate

PEG-15 Glyceryl Oleate

3.8

A reliable 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
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Emulsifier

PEG-15 Glyceryl Ricinoleate

PEG-15 Glyceryl Ricinoleate

3.8

A gentle emulsifier that helps mix water and oil in products, generally well-tolerated but may be drying for very sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-15 Glyceryl Stearate

PEG-15 Glyceryl Stearate

3.8

A reliable synthetic emulsifier that keeps creams and lotions stable, but may not suit those avoiding PEG compounds.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-15 Glyceryl Triisostearate

PEG-15 GLYCERYL TRIISOSTEARATE

3.5

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-15 Glyceryl Trioleate

PEG-15 Glyceryl Trioleate

3.5

A reliable emulsifier that helps mix oil and water, but may not suit those avoiding PEG compounds.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-15 Glyceryl Tristearate

PEG-15 Glyceryl Tristearate

3.8

A reliable synthetic emulsifier that helps create smooth, stable creams and lotions with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

PEG-15 Hydrogenated Lanolin

PEG-15 Hydrogenated Lanolin

3.5

A gentle, modified lanolin that moisturizes and helps blend water and oil, but may be too heavy for acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
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Surfactant

PEG-15 Hydrogenated Tallow Amine

PEG-15 Hydrogenated Tallow Amine

3.5

A synthetic emulsifier that helps mix oil and water, but may cause irritation or clog pores in sensitive or acne-prone individuals.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-15 Hydroxystearate

PEG-15 Hydroxystearate

3.8

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

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-15 Jojoba Acid

PEG-15 Jojoba Acid

3.8

A gentle, semi-synthetic surfactant derived from jojoba oil that helps cleanse without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

PEG-15 Jojoba Alcohol

PEG-15 JOJOBA ALCOHOL

3.8

A gentle emulsifier derived from jojoba oil that helps blend water and oil in formulas, generally well-tolerated but may not suit ultra-sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-15 Lanolate

PEG-15 Lanolate

3.8

PEG-15 Lanolate is a gentle emulsifier derived from lanolin, but it may clog pores for acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Film Former

PEG-15 Methacrylate Copolymer

ACRYLATES/METHOXY PEG-15 METHACRYLATE COPOLYMER

3.5

A synthetic polymer that helps products stay put and resist water, generally safe but not a skincare active.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Surfactant

PEG-15 Oleamine

PEG-15 Oleamine

3.5

PEG-15 Oleamine is a synthetic emulsifier that helps mix oil and water, but it may be irritating for sensitive skin and has moderate comedogenic potential.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Antistatic Agent

PEG-15 Oleammonium Chloride

PEG-15 Oleammonium Chloride

3.8

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

Irritation

moderate

Source

synthetic

beautyskincarehaircaresurfactant
Read ingredient review

Emulsifier

PEG-15 Oleate

PEG-15 Oleate

3.5

PEG-15 Oleate is a synthetic emulsifier that helps mix oil and water, but it may be mildly irritating for sensitive skin and has moderate comedogenic potential.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-15 Phytosterol

PEG-15 Phytosterol

4.0

A gentle, plant-based emulsifier that helps stabilize formulas and may support skin barrier function without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

PEG-15 Soyamine

PEG-15 Soyamine

3.5

PEG-15 Soyamine is an effective emulsifier but may cause irritation in sensitive skin, especially at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-15 Stearamide

PEG-15 Stearamide

3.5

A synthetic emulsifier that helps mix water and oil, generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-15 Stearamine

PEG-15 Stearamine

3.5

PEG-15 Stearamine is a synthetic emulsifier that helps mix oil and water in products, but it may be moderately irritating for sensitive skin and has a moderate comedogenic risk.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-15 Stearate

PEG-15 Stearate

3.8

A reliable 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
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Antistatic Agent

PEG-15 Stearmonium Chloride

PEG-15 Stearmonium Chloride

3.5

PEG-15 Stearmonium Chloride is a synthetic conditioning ingredient that reduces static and softens hair, but it may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

PEG-15 Tallate

PEG-15 TALLATE

3.5

PEG-15 Tallate is a workhorse emulsifier that helps mix oil and water, but it may be mildly irritating for sensitive skin and has moderate comedogenic potential.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-15 Tallow Amine

PEG-15 Tallow Amine

3.0

PEG-15 Tallow Amine is an effective emulsifier but may cause irritation for sensitive skin and raises ethical concerns due to its animal-derived origin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-15 Tallow Polyamine

PEG-15 Tallow Polyamine

3.0

PEG-15 Tallow Polyamine is a synthetic conditioning agent that can improve hair feel but may cause irritation for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

PEG-15/Laureth Polysiloxane Crosspolymer

PEG-15/LAURYL POLYDIMETHYLSILOXYETHYL DIMETHICONE CROSSPOLYMER

4.0

A gentle silicone emulsifier that improves product feel and stability, but may not suit those avoiding silicones or PEG compounds.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-150 Dibehenate

PEG-150 Dibehenate

3.8

A safe, synthetic thickener that helps create a rich, creamy texture in lotions and conditioners without common irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-150 Dilaurate

PEG-150 Dilaurate

3.8

A safe, widely used synthetic thickener and emulsifier that helps products feel smooth and spread evenly, but may be too heavy for very oily or acne-prone skin in high concentrations.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-150 Dioleate

PEG-150 Dioleate

3.8

A safe, effective thickener and emulsifier that helps blend oil and water in cleansers and lotions, but may feel heavy on very oily skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-150 Distearate

PEG-150 Distearate

4.0

A gentle synthetic thickener and stabilizer that helps create smooth, creamy textures without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-150 Lanolin

PEG-150 Lanolin

3.8

A gentle, water-soluble lanolin derivative that helps cleanse and condition without the heavy feel of traditional lanolin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Thickener

PEG-150 Laurate

PEG-150 Laurate

3.8

A gentle synthetic thickener and emulsifier that helps create rich, stable lather in cleansers without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-150 Oleate

PEG-150 Oleate

3.5

A safe, workhorse emulsifier that helps mix oil and water in your products, but it can feel heavy on very oily or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-150 Stearate

PEG-150 Stearate

4.0

A gentle, widely used emulsifier that stabilizes formulas and gives a smooth feel, with a strong safety record in cosmetics.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-16 Castor Oil

PEG-16 Castor Oil

3.8

PEG-16 Castor Oil is a gentle emulsifier that helps mix oil and water, making it a common ingredient in cleansers and makeup removers, but it may not suit those avoiding PEGs.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-16 Castor Oil Dioleate

PEG-16 Castor Oil Dioleate

3.5

A reliable emulsifier that helps mix oil and water, but may feel heavy on very oily or acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-16 Dilaurate

PEG-16 Dilaurate

3.8

PEG-16 Dilaurate is a reliable emulsifier that helps mix water and oil in your products, but it may not be ideal for very sensitive or compromised skin due to potential penetration enhancer effects.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-16 Hydrogenated Castor Oil

PEG-16 Hydrogenated Castor Oil

3.8

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review