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 1,375
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

Antistatic Agent

PEG-15 Cocomonium Chloride

PEG-15 Cocomonium Chloride

3.5

An effective antistatic and conditioning agent for hair, but may cause irritation for sensitive scalps at higher concentrations.

Irritation

moderate

Source

semi-synthetic

beautyhaircaresurfactant
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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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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
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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
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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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Antistatic Agent

PEG-2 Cocomonium Chloride

PEG-2 Cocomonium Chloride

3.5

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

Irritation

moderate

Source

synthetic

beautyhaircareconditioning agent
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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
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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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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
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Antistatic Agent

PEG-2 Stearmonium Chloride

PEG-2 Stearmonium Chloride

3.8

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

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

PEG-25 Diethylmonium Chloride

PEG-25 Diethylmonium Chloride

3.5

A synthetic conditioning agent that helps reduce static and improve hair feel, but may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

PEG-25 Methacrylate Copolymer

C18-22 ALKYL PEG-25 METHACRYLATE/DIETHYLAMINOETHYL METHACRYLATE COPOLYMER

3.8

A synthetic polymer that helps products stay put, resist water, and feel smooth, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Emollient

PEG-3 Dimethicone

PEG-3 Dimethicone

4.0

A gentle silicone that smooths skin and hair without heavy buildup, but may not suit those avoiding silicones entirely.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

PEG-3 Rapeseed Aminopropylamine

PEG-3 RAPESEED AMINOPROPYLAMINE

3.5

A conditioning ingredient that can improve softness and manageability, but may be irritating or clog pores for some.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

PEG-3 Tallow Aminopropylamine

PEG-3 TALLOW AMINOPROPYLAMINE

3.5

An effective hair conditioner derived from animal fat, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

PEG-3 Tallow Propylenedimonium Dimethosulfate

PEG-3 TALLOW PROPYLENEDIMONIUM DIMETHOSULFATE

3.5

A conditioning ingredient from animal-derived tallow that softens hair and reduces static, but may be too heavy for fine hair or oily skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Thickener

PEG-44 Polybutylene Glycol Ether

HYDROGENATED DIMER DILINOLEYL PEG-44/POLY(1,2-BUTANEDIOL)-15 DIMETHYL ETHER

3.8

A synthetic polymer that helps create a smooth, non-greasy gel texture in skincare and haircare products, with a low irritation profile.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

PEG-5 Cocomonium Methosulfate

PEG-5 COCOMONIUM METHOSULFATE

3.5

A gentle, coconut-derived conditioning ingredient that helps reduce static and soften hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Surfactant

PEG-5 DEDM Hydantoin

PEG-5 DEDM Hydantoin

3.5

A synthetic ingredient that helps products feel smooth and stay fresh, but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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

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
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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

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-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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Surfactant

PEG-6 Stearyl Guanidine

PEG-6 Stearyl Guanidine

3.8

A synthetic conditioning agent that helps hair feel soft and smooth, but its safety data is limited compared to more common alternatives.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Conditioning agent

PEG-7 Amodimethicone

PEG-7 Amodimethicone

4.0

A gentle silicone that smooths hair and reduces frizz without heavy buildup, but may not suit very fine or low-porosity hair.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Conditioning Agent

PEG-7 Dimethicone Panthenyl Phosphate

POTASSIUM DIMETHICONE PEG-7 PANTHENYL PHOSPHATE

4.0

A gentle silicone derivative that conditions hair and skin while adding a touch of moisture from panthenol (provitamin B5).

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Hair Conditioner

PEG-8 Amodimethicone

PEG-8 Amodimethicone

4.0

A gentle silicone that coats hair to reduce tangles and add shine without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Film Former

PEG-8/SMDI Copolymer

PEG-8/SMDI Copolymer

3.8

A synthetic film-former that helps makeup and sunscreen stay put longer, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

PEG-9 Diethylmonium Chloride

PEG-9 Diethylmonium Chloride

3.8

A synthetic conditioning agent that helps reduce static and soften hair, generally considered safe for most people.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

PEG/PPG-1/25 Diethylmonium Chloride

PEG/PPG-1/25 Diethylmonium Chloride

3.5

A synthetic conditioning ingredient that helps reduce static and improve the feel of hair and skin, but may not suit those avoiding PEGs.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Emollient

PEG/PPG-15/15 Acetate Dimethicone

PEG/PPG-15/15 Acetate Dimethicone

4.0

A gentle silicone that gives skin and hair a silky, smooth feel without clogging pores, but may not be ideal for those avoiding silicones.

Irritation

low

Source

synthetic

beautyskincarehaircareemollient
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Humectant

PEG/PPG-16/17 Copolymer

PEG/PPG-16/17 Copolymer

3.8

A gentle synthetic ingredient that helps products feel silky and spread evenly without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Emollient

PEG/PPG-28/21 Acetate Dimethicone

PEG/PPG-28/21 Acetate Dimethicone

4.0

A gentle silicone that improves texture and feel in skincare and haircare, but may not suit those avoiding silicones.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresilicone
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Emollient

PEG/PPG-4/12 Dimethicone

PEG/PPG-4/12 Dimethicone

4.0

A gentle silicone that improves product feel and spreadability, generally well-tolerated by most skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareemollient
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Emollient

PEG/PPG-6/11 Dimethicone

PEG/PPG-6/11 Dimethicone

4.0

A gentle silicone that makes products feel silky and spread easily, but may not suit those avoiding silicones entirely.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

PEI-14 PEG-24/PPG-16 Copolymer

PEI-14 PEG-24/PPG-16 Copolymer

3.5

A synthetic polymer that helps products spread smoothly and leaves a light, flexible film on skin or hair for a conditioned feel.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

PEI-1500

PEI-1500

3.5

PEI-1500 is a synthetic polymer that helps products spread smoothly and stay put, but it's not a star ingredient for skin health.

Irritation

low

Source

synthetic

beautyskincarehaircare
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