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-5 Tall Oil Sterol

PEG-5 TALL OIL STEROL

4.0

A mild, plant-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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Surfactant

PEG-5 Tallate

PEG-5 TALLATE

3.8

A functional emulsifier that helps mix oil and water in cleansers and creams, but offers no direct skin benefit and may be unnecessary for simple routines.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-5 Tallow Amide

PEG-5 TALLOW AMIDE

3.5

An effective but dated cleansing ingredient that can be drying for some skin types; better options exist today.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Antistatic Agent

PEG-5 Tallow Benzonium Chloride

PEG-5 Tallow Benzonium Chloride

3.0

A conditioning ingredient that can reduce static and soften hair, but may cause irritation or clog pores in some people.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Emollient

PEG-5 Tricapryl Citrate

PEG-5 TRICAPRYL CITRATE

4.0

A gentle, semi-synthetic ingredient that helps products feel smooth and spread easily without clogging pores or causing irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

PEG-5 Tricetyl Citrate

PEG-5 TRICETYL CITRATE

3.8

A gentle synthetic emollient that helps soften skin and improve product texture, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emulsifier

PEG-5 Trilauryl Citrate

PEG-5 TRILAURYL CITRATE

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-5 Trimyristyl Citrate

PEG-5 Trimyristyl Citrate

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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Emulsifier

PEG-5 Tristearyl Citrate

PEG-5 Tristearyl Citrate

4.0

A reliable, low-irritation emulsifier that helps create smooth, stable creams and lotions without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

PEG-5 Tsubakiate Glycerides

PEG-5 TSUBAKIATE GLYCERIDES

4.0

A gentle, oil-derived emollient that softens skin and hair without feeling heavy, with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Preservative

PEG-5 Undecylenoyl Paraben

UNDECYLENOYL PEG-5 PARABEN

2.0

A paraben-based preservative that is effective but controversial due to paraben safety concerns.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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Emulsifier

PEG-50 Castor Oil

PEG-50 Castor Oil

4.0

PEG-50 Castor Oil is a gentle emulsifier that helps mix water and oil in cleansers, but its production involves ethoxylation, which may raise purity concerns for some users.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

PEG-50 Glyceryl Isostearate

PEG-50 Glyceryl Isostearate

3.8

A reliable emulsifier that helps create stable, creamy textures, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-50 Glyceryl Triisostearate

PEG-50 Glyceryl Triisostearate

3.8

A reliable synthetic emulsifier that helps oil and water mix in your creams and cleansers, but it's not a star active ingredient.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-50 Glyceryl Trioleate

PEG-50 Glyceryl Trioleate

3.5

A gentle synthetic emulsifier that helps mix oil and water in your products, but it's not a star active ingredient.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-50 Hydrogenated Castor Oil

PEG-50 HYDROGENATED CASTOR OIL

3.8

A gentle emulsifier that helps mix oil and water, commonly used in cleansers and makeup removers, with a low risk of irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

PEG-50 Hydrogenated Palmamide

PEG-50 Hydrogenated Palmamide

3.5

A mild cleansing and emulsifying ingredient derived from palm oil, generally safe but with environmental concerns due to palm sourcing.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-50 Hydrogenated Tallow Amine

PEG-50 Hydrogenated Tallow Amine

3.5

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

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-50 Lanolin

PEG-50 Lanolin

3.5

A gentle, water-soluble lanolin derivative that helps blend oil and water in cleansers and moisturizers, but may not suit those with wool allergies.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

PEG-50 Shea Butter

PEG-50 Shea Butter

3.8

A gentle, water-friendly emollient that brings shea butter's moisturizing feel to rinse-off products without greasiness.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

PEG-50 Stearamide

PEG-50 Stearamide

3.5

PEG-50 Stearamide is a synthetic emulsifier that helps blend oil and water in creams and lotions, but its PEG component raises mild purity concerns for some users.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-50 Stearamine

PEG-50 Stearamine

3.5

PEG-50 Stearamine is a synthetic emulsifier that helps mix oil and water, but it may cause irritation for sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-50 Stearate

PEG-50 Stearate

3.8

A gentle synthetic emulsifier that helps create stable, creamy textures in skincare.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-50 Tallow Amide

PEG-50 TALLOW AMIDE

3.5

PEG-50 Tallow Amide is a foaming cleanser ingredient that can be effective but may cause irritation for sensitive skin and raises ethical concerns due to its animal-derived origin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-54 Castor Oil

PEG-54 Castor Oil

3.8

A gentle emulsifier that helps mix oil and water in cleansers and lotions, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-54 Hydrogenated Castor Oil

PEG-54 Hydrogenated Castor Oil

4.0

A gentle emulsifier that helps blend oil and water in cleansers and makeup removers, with a low risk of irritation.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-55 Castor Oil

PEG-55 Castor Oil

4.0

A gentle, water-soluble emulsifier that helps blend oils with water for effective cleansing without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-55 Hydrogenated Castor Oil

PEG-55 HYDROGENATED CASTOR OIL

4.0

A gentle, effective emulsifier that helps blend oil and water in cleansers and makeup removers, with a low risk of irritation.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactantemulsifier
Read ingredient review

Emulsifier

PEG-55 Lanolin

PEG-55 Lanolin

3.8

A gentle, water-soluble lanolin derivative that helps blend oil and water in formulas while providing light moisturizing benefits.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-6 Almond Glycerides

PEG-6 Almond Glycerides

4.0

A mild, semi-synthetic emulsifier that helps blend water and oil in skincare products while providing light skin conditioning.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-6 Butylene Glycol Laurate

PEG-6 Butylene Glycol Laurate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

PEG-6 Caprylate/Caprate

PEG-6 Caprylate/Caprate

4.0

A gentle, water-friendly emollient that helps products spread smoothly without leaving a greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

PEG-6 Caprylic/Capric Glycerides

PEG-6 CAPRYLIC/CAPRIC GLYCERIDES

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-6 Cocamide

PEG-6 Cocamide

3.8

A mild cleansing agent that helps create foam and lift dirt, but may be slightly drying for very sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-6 Cocamide Phosphate

PEG-6 Cocamide Phosphate

3.5

A mild cleansing agent that helps remove dirt and oil, but may be slightly drying for very sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing
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Emulsifier

PEG-6 Diisostearate

PEG-6 Diisostearate

4.0

A reliable synthetic emulsifier that helps mix oil and water in your products, generally considered safe and non-irritating at typical levels.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-6 Dilaurate

PEG-6 Dilaurate

3.8

PEG-6 Dilaurate is a gentle synthetic emulsifier that helps mix water and oil in your products, but it may not be ideal for very sensitive or compromised skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-6 Dioleate

PEG-6 Dioleate

3.5

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-6 Distearate

PEG-6 Distearate

3.5

A safe, widely used emulsifier that helps keep your products smooth and stable, but it's synthetic and may not appeal to those seeking natural-only formulas.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

PEG-6 Glyceryl Caprate

PEG-6 Glyceryl Caprate

4.0

A gentle, water-friendly emollient that helps products spread smoothly without leaving a greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincareemollientsurfactant
Read ingredient review

Emulsifier

PEG-6 Glyceryl Isostearate

PEG-6 Glyceryl Isostearate

4.0

A gentle emulsifier that helps create stable, creamy textures without heavy irritation or clogging.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-6 Glyceryl Tristearate

PEG-6 Glyceryl Tristearate

4.0

A gentle, PEG-based emulsifier that helps create stable, creamy textures in skincare without significant irritation or pore-clogging risk.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-6 Hydrogenated Castor Oil

PEG-6 Hydrogenated Castor Oil

4.0

A gentle emulsifier that helps oils and water mix, making cleansers and toners feel smooth without heavy residue.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

PEG-6 Isolaureth-6

PEG-6 ISOLAURYL THIOETHER

3.8

A synthetic surfactant that helps cleansers foam and rinse clean, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-6 Isopalmitate

PEG-6 Isopalmitate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-6 Isostearate

PEG-6 Isostearate

3.8

PEG-6 Isostearate is a safe, widely used emulsifier that helps mix oil and water, but it may be less suitable for those avoiding PEG compounds.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

PEG-6 Lanolate

PEG-6 Lanolate

3.8

A gentle, lanolin-derived emollient that helps moisturize and stabilize products, but may be comedogenic for some.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Surfactant

PEG-6 Lauramide

PEG-6 Lauramide

3.5

PEG-6 Lauramide is a synthetic cleansing agent that helps remove dirt and oil, but may be slightly drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-6 Laurate

PEG-6 Laurate

3.8

PEG-6 Laurate is a common emulsifier that helps mix oil and water, but may be mildly irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-6 Laurate/Tartrate

PEG-6 Laurate/Tartrate

3.5

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

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emollient

PEG-6 Methicone Acetate

PEG-6 METHICONE ACETATE

4.0

A gentle silicone derivative that improves product feel and spreadability without heavy residue, suitable for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Humectant

PEG-6 Methyl Ether

PEG-6 Methyl Ether

4.0

A gentle synthetic humectant that helps keep skin hydrated and improves product feel without common irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
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