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

Soyamidopropalkonium Chloride

Soyamidopropalkonium Chloride

3.8

A gentle conditioning ingredient from soy that reduces static and softens hair, but may cause mild irritation in sensitive skin.

Irritation

moderate

Source

semi-synthetic

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Conditioning Agent

Soyamidopropyl Dimethylamine

Soyamidopropyl Dimethylamine

4.0

A gentle, plant-derived conditioning agent that softens hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Conditioning Agent

Soyamidopropyl Ethyldimonium Ethosulfate

SOYAMIDOPROPYL ETHYLDIMONIUM ETHOSULFATE

4.0

A gentle, soy-derived conditioning ingredient that reduces static and improves softness without heavy buildup, suitable for most hair types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Conditioning Agent

Soyamidopropyl Wheat Protein

SOYAMIDOETHYLDIMONIUM/TRIMONIUM HYDROXYPROPYL HYDROLYZED WHEAT PROTEIN

4.0

A gentle conditioning ingredient derived from wheat protein that helps reduce static and improve softness in hair and skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Surfactant

Soyaminopropylamine

Soyaminopropylamine

3.5

A gentle conditioning agent from soy that helps soften hair and skin, but may cause irritation for sensitive types at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarehaircare
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Antistatic Agent

Soyethyldimonium Ethosulfate

SOYETHYLDIMONIUM ETHOSULFATE

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Soytrimonium Chloride

SOYTRIMONIUM CHLORIDE

4.0

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

Irritation

low

Source

natural

beautyskincarehaircare
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Antistatic Agent

Steapyrium Chloride

Steapyrium Chloride

3.5

Steapyrium Chloride is a synthetic conditioning agent that reduces static and improves manageability in hair, with a good safety profile for most users.

Irritation

low

Source

synthetic

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Viscosity Controlling

Stearalkonium Bentonite

STEARALKONIUM BENTONITE

3.8

A modified clay that thickens formulas and helps keep ingredients evenly mixed, but it can feel heavy on some skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Stearalkonium Chloride

Stearalkonium Chloride

3.8

Stearalkonium chloride is an effective 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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Viscosity Controlling

Stearamide AMP

STEARAMIDE AMP

3.5

A synthetic thickener and stabilizer that improves texture but may be too heavy for oily or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Surfactant

Stearamidoethyl Diethylamine

STEARAMIDOETHYL DIETHYLAMINE

3.5

A synthetic conditioning agent that helps soften hair and stabilize formulas, but may be mildly irritating for sensitive skin.

Irritation

moderate

Source

synthetic

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Antistatic Agent

Stearamidopropalkonium Chloride

Stearamidopropalkonium 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

beautyskincarehaircare
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Antistatic Agent

Stearamidopropyl Cetearyl Dimonium Tosylate

STEARAMIDOPROPYL CETEARYL DIMONIUM TOSYLATE

3.8

A synthetic conditioning ingredient that helps reduce frizz and static while adding softness to hair and skin, but may feel heavy for very fine hair.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioner

Stearamidopropyl Dimethicone

STEARAMIDOPROPYL DIMETHICONE

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Conditioning Agent

Stearamidopropyl Dimethylamine

Stearamidopropyl Dimethylamine

4.0

A gentle conditioning ingredient that helps detangle hair and soften skin without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Stearamidopropyl Morpholine

STEARAMIDOPROPYL MORPHOLINE

3.5

A synthetic conditioner that reduces static and softens hair, but may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Stearamidopropyl Morpholine Lactate

STEARAMIDOPROPYL MORPHOLINE LACTATE

3.5

A synthetic conditioning agent that helps reduce static and soften hair, generally well-tolerated but with limited research on long-term effects.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioning Agent

Steardimonium Hydroxypropyl Hydrolyzed Casein

Steardimonium Hydroxypropyl Hydrolyzed Casein

3.8

A gentle conditioning ingredient derived from milk protein that helps hair feel smoother and less frizzy without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Emollient

Stearoxy Dimethicone

Stearoxy Dimethicone

4.0

A gentle silicone that smooths skin and hair without a heavy feel, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Stearoxypropyl Dimethylamine

Stearoxypropyl Dimethylamine

3.8

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

Irritation

moderate

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Stearoxypropyltrimonium Chloride

Stearoxypropyltrimonium Chloride

3.5

A gentle conditioning ingredient that reduces static and improves manageability in hair products, with a low risk of irritation.

Irritation

low

Source

synthetic

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Antistatic Agent

Steartrimonium Bromide

Steartrimonium Bromide

3.8

An effective conditioning ingredient 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

Steartrimonium Chloride

Steartrimonium Chloride

3.8

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

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Hair Conditioner

Stearyl Aminopropyl Methicone

Stearyl Aminopropyl Methicone

4.0

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

Irritation

low

Source

synthetic

beautyskincarehaircare
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Surfactant

Stearyl Betaine

Stearyl Betaine

4.0

A gentle, conditioning surfactant that cleanses without over-drying, making it a good choice for sensitive or dry skin and hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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