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-30 Glyceryl Diisostearate

PEG-30 GLYCERYL DIISOSTEARATE

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Glyceryl Isostearate

PEG-30 Glyceryl Isostearate

3.8

A reliable synthetic emulsifier that helps create stable, creamy textures, but may be too heavy for very oily or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Glyceryl Laurate

PEG-30 Glyceryl Laurate

3.8

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Glyceryl Oleate

PEG-30 Glyceryl Oleate

3.5

PEG-30 Glyceryl Oleate is a workhorse emulsifier that helps mix oil and water, but it may be slightly irritating for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareemulsifier
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Surfactant

PEG-30 Glyceryl Soyate

PEG-30 Glyceryl Soyate

4.0

A gentle, plant-derived surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Emulsifier

PEG-30 Glyceryl Stearate

PEG-30 Glyceryl Stearate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Glyceryl Triisostearate

PEG-30 Glyceryl Triisostearate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Glyceryl Trioleate

PEG-30 Glyceryl Trioleate

3.8

A reliable emulsifier that helps water and oil mix in creams and lotions, but it is synthetic and may not suit those avoiding PEGs.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Hydrogenated Castor Oil

PEG-30 Hydrogenated Castor Oil

3.8

A reliable emulsifier that helps mix oil and water in cleansers and lotions, but may feel heavy on very oily skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Hydrogenated Lanolin

PEG-30 Hydrogenated Lanolin

3.8

A gentle emulsifier that helps blend oil and water in creams, but may clog pores in acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

PEG-30 Hydrogenated Tallow Amine

PEG-30 Hydrogenated Tallow Amine

3.5

An effective emulsifier and surfactant, but may cause irritation in sensitive skin and raises environmental concerns due to ethoxylation.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Emulsifier

PEG-30 Isostearate

PEG-30 Isostearate

3.5

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

PEG-30 Lanolin

PEG-30 Lanolin

3.5

PEG-30 Lanolin is a water-friendly version of lanolin that softens skin and helps blend oil and water in formulas, but it may clog pores for some people.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
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Surfactant

PEG-30 Oleamine

PEG-30 Oleamine

3.5

PEG-30 Oleamine is an effective emulsifier but may cause irritation or clog pores for sensitive or acne-prone skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Emulsifier

PEG-30 Phytosterol

PEG-30 Phytosterol

4.0

A gentle, plant-based emulsifier that helps create stable, creamy formulas while offering mild skin conditioning.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Sorbitan Tetraoleate

PEG-30 Sorbitan Tetraoleate

3.5

A reliable synthetic emulsifier that helps oil and water mix in creams and lotions, but it may not suit those seeking fully natural formulas.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Soy Sterol

PEG-30 SOY STEROL

4.0

A reliable, low-irritation emulsifier that helps create stable, creamy formulas while offering mild skin conditioning.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-30 Stearate

PEG-30 Stearate

3.5

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Surfactant

PEG-30 Tallow Amine

PEG-30 Tallow Amine

3.5

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

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

PEG-32 Dilaurate

PEG-32 Dilaurate

3.8

A synthetic emulsifier that helps blend oil and water in creams and lotions, generally considered safe and low-irritation for most skin types.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-32 Dioleate

PEG-32 Dioleate

3.5

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-32 Distearate

PEG-32 Distearate

3.8

A reliable synthetic emulsifier that helps blend oil and water in creams and lotions, generally considered safe and non-irritating at typical use levels.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-32 Laurate

PEG-32 Laurate

3.8

A synthetic emulsifier that helps blend oil and water in cleansers, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

PEG-32 Methyl Ether Dimethicone

PEG-32 METHYL ETHER DIMETHICONE

4.0

A gentle silicone that helps products glide on smoothly without clogging pores, but may not suit those avoiding silicones entirely.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

PEG-32 Oleate

PEG-32 Oleate

3.5

PEG-32 Oleate is a safe, widely used emulsifier that helps products feel smooth and rinse cleanly, but it may be less ideal for very sensitive or reactive skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-32 Stearate

PEG-32 Stearate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-33 Castor Oil

PEG-33 Castor Oil

4.0

A gentle, water-soluble emulsifier that helps mix oils into water-based formulas without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-35 Almond Glycerides

PEG-35 ALMOND GLYCERIDES

4.0

A mild, almond-derived emulsifier that helps blend water and oil in creams and lotions without heavy irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-35 Castor Oil

PEG-35 Castor Oil

4.0

PEG-35 Castor Oil is a reliable emulsifier that helps mix oil and water, making it a staple in many cleansers and creams without causing irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-35 Hydrogenated Castor Oil

PEG-35 HYDROGENATED CASTOR OIL

4.0

A well-tolerated emulsifier that helps mix oil and water in your products, but may feel heavy on very oily skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

PEG-35 Lanolin

PEG-35 Lanolin

3.8

A gentle, water-friendly lanolin derivative that moisturizes and helps blend oil and water in formulas, but may not suit those with wool allergies.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
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Emulsifier

PEG-35 Soy Glycerides

PEG-35 SOY GLYCERIDES

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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Emulsifier

PEG-36 Castor Oil

PEG-36 Castor Oil

3.5

PEG-36 Castor Oil is a reliable emulsifier that helps mix water and oil, but its PEG component raises mild concerns about potential impurities in unrefined grades.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

PEG-36 Oleate

PEG-36 Oleate

3.5

PEG-36 Oleate is a safe and effective emulsifier that helps mix oil and water, but it may be a concern for those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-36 Stearate

PEG-36 Stearate

3.8

A reliable emulsifier that keeps creams and lotions stable, but may not be ideal for very sensitive or compromised skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Humectant

PEG-4

PEG-4

3.8

PEG-4 is a gentle, water-loving ingredient that helps hydrate the skin and improve product texture, but it may be contaminated with impurities in poorly refined forms.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emollient

PEG-4 Caprylic/Capric Triglyceride

CAPRYLIC/CAPRIC TRIGLYCERIDE PEG-4 ESTERS

3.8

A gentle, semi-synthetic emollient that helps products spread smoothly and feel silky, but may not suit those avoiding PEG compounds.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

PEG-4 Castor Oil

PEG-4 Castor Oil

4.0

A safe, effective emulsifier that helps mix oil and water in your products, with a low risk of irritation or clogged pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-4 Cocamide

PEG-4 Cocamide

3.5

PEG-4 Cocamide is a common cleansing agent that helps remove dirt and oil, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

PEG-4 Cocamine

PEG-4 Cocamine

3.5

PEG-4 Cocamine is a mild cleansing agent that helps products foam and rinse cleanly, but it may cause irritation for very sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Emollient

PEG-4 Dicocoate

PEG-4 Dicocoate

3.8

A gentle synthetic emollient that helps products spread smoothly and feel less greasy, but may not suit those avoiding PEG compounds.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

PEG-4 Diheptanoate

PEG-4 Diheptanoate

3.8

A lightweight synthetic emollient that helps products glide on smoothly without a greasy feel, but it offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emulsifier

PEG-4 Diisostearate

PEG-4 Diisostearate

3.5

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-4 Dilaurate

PEG-4 Dilaurate

3.5

PEG-4 Dilaurate is a workhorse emulsifier that helps mix water and oil, but it may be slightly pore-clogging for acne-prone skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Film Former

PEG-4 Dimethacrylate

PEG-4 Dimethacrylate

3.5

A synthetic film-former that helps nail and makeup products last longer, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarenail care
Read ingredient review

Emulsifier

PEG-4 Dioleate

PEG-4 Dioleate

3.5

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

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-4 Distearate

PEG-4 Distearate

3.8

A safe, widely used synthetic emulsifier that helps blend oil and water in creams and lotions, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-4 Distearyl Ether

PEG-4 Distearyl Ether

4.0

A gentle synthetic emulsifier that helps create stable, creamy formulas without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-4 Ditallow Ether

PEG-4 Ditallow Ether

3.5

An effective emulsifier from animal-derived tallow, but may cause irritation for sensitive skin and raises ethical concerns for vegans.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Emollient

PEG-4 Ethylhexanoate

PEG-4 Ethylhexanoate

3.8

A lightweight synthetic emollient that softens skin without a greasy feel, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emulsifier

PEG-4 Glyceryl Distearate

PEG-4 Glyceryl Distearate

4.0

A gentle, semi-synthetic emulsifier that helps create stable, creamy textures with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-4 Glyceryl Tristearate

PEG-4 Glyceryl Tristearate

4.0

A gentle synthetic emulsifier that helps create stable, creamy textures in skincare without significant irritation or clogging concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-4 Isostearate

PEG-4 Isostearate

3.8

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

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emollient

PEG-4 Lanolate

PEG-4 Lanolate

3.8

PEG-4 Lanolate is a gentle, lanolin-derived emollient that softens skin and helps other ingredients absorb, but it may clog pores for acne-prone individuals.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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