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

Surfactant

PEG-5 Hydrogenated Tallow Amine

PEG-5 Hydrogenated Tallow Amine

3.5

An effective emulsifier and antistatic agent, but may cause irritation or clog pores in sensitive or acne-prone individuals.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-5 Isodecyloxypropylamine

PEG-5 Isodecyloxypropylamine

3.5

A mild synthetic surfactant that helps cleanse and condition hair and skin, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

PEG-5 Isononanoate

PEG-5 Isononanoate

3.8

A synthetic emollient that helps products feel silky and spread easily, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

PEG-5 Lanolate

PEG-5 Lanolate

3.5

PEG-5 Lanolate is a gentle, water-friendly emollient that helps soften skin and stabilize formulas, but may be moderately clogging for acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
Read ingredient review

Emollient

PEG-5 Lanolin

PEG-5 Lanolin

3.8

PEG-5 Lanolin is a water-friendly version of lanolin that softens skin and helps blend oil and water, but it may clog pores for some people.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

PEG-5 Lanolinamide

PEG-5 Lanolinamide

3.8

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-5 Lauramide

PEG-5 Lauramide

3.5

PEG-5 Lauramide is a synthetic emulsifier that helps cleansers foam and mix oil with water, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-5 Oleamide

PEG-5 Oleamide

3.5

PEG-5 Oleamide helps blend oil and water in cleansers and lotions, but may cause irritation for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-5 Oleamide Dioleate

PEG-5 OLEAMIDE DIOLEATE

3.5

A synthetic emulsifier that helps mix oil and water, but may be too heavy or irritating for sensitive or acne-prone skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-5 Oleamine

PEG-5 Oleamine

3.5

PEG-5 Oleamine helps cleansers foam and mix oil with water, but it may be moderately irritating for sensitive skin and has some environmental concerns.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Antistatic Agent

PEG-5 Oleammonium Methosulfate

PEG-5 Oleammonium Methosulfate

3.5

A synthetic conditioning agent that reduces static and softens hair, but may cause irritation for sensitive scalps at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

PEG-5 Oleate

PEG-5 Oleate

3.5

PEG-5 Oleate helps mix oil and water in cleansers, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecleansing
Read ingredient review

Emollient

PEG-5 Pentaerythrityl Dendrimer

PEG-5 PENTAERYTHRITYL DMPA-2 CAPRATE/CAPRYLATE DENDRIMER

4.0

A high-tech synthetic ingredient that helps other active ingredients penetrate better while providing a silky, non-greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollientdelivery agent
Read ingredient review

Humectant

PEG-5 Pentaerythrityl Ether

PEG-5 PENTAERYTHRITYL ETHER

3.5

A gentle synthetic humectant that helps keep skin hydrated without common irritation, but offers limited additional benefits beyond moisture.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Emulsifier

PEG-5 Phytosterol

PEG-5 Phytosterol

4.3

A mild, plant-based emulsifier that helps blend oil and water while offering skin-soothing and barrier-supporting benefits.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-5 Rapeseed Sterol

PEG-5 RAPESEED STEROL

4.0

A mild, plant-derived emulsifier that helps blend water and oil in creams and lotions while leaving skin feeling smooth.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-5 Sorbitan Isostearate

PEG-5 Sorbitan Isostearate

4.0

A gentle emulsifier that helps oil and water mix, making creams and lotions smooth and stable without heavy irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-5 Soy Sterol

PEG-5 SOY STEROL

4.3

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-5 Soyamine

PEG-5 SOYAMINE

3.5

PEG-5 Soyamine is an effective emulsifier and cleanser, but may be irritating for sensitive skin and has moderate comedogenic potential.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-5 Stearamine

PEG-5 Stearamine

3.5

PEG-5 Stearamine is a synthetic emulsifier that helps blend oil and water, but may cause irritation or clog pores for some skin types.

Irritation

moderate

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Antistatic Agent

PEG-5 Stearyl Ammonium Chloride

PEG-5 Stearyl Ammonium Chloride

3.5

A synthetic conditioning agent that reduces static and softens hair, but may cause irritation for sensitive scalps at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarehaircaresurfactant
Read ingredient review

Antistatic Agent

PEG-5 Stearyl Ammonium Lactate

PEG-5 Stearyl Ammonium Lactate

3.5

A synthetic conditioning agent that reduces static and softens hair, but may cause irritation for sensitive scalps.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review