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

Fragrance

Star Anise Fruit/Seed Oil

ILLICIUM VERUM FRUIT/SEED OIL

3.8

Star Anise Fruit/Seed Oil offers antimicrobial and soothing benefits but can be irritating for sensitive skin due to its essential oil nature.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Star Anise Leaf Oil

ILLICIUM VERUM LEAF OIL

3.8

Star Anise Leaf Oil adds a pleasant scent and some antioxidant benefits, but its essential oil nature means it can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Star Apple Fruit Extract

Chrysophyllum Cainito Fruit Extract

3.8

A gentle, antioxidant-rich fruit extract that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing agent

Star of Bethlehem Bulb Extract

ORNITHOGALUM UMBELLATUM BULB EXTRACT

3.8

A gentle botanical extract that may help calm irritated skin and provide antioxidant support, though research is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Absorbent

Starch Acetate/Adipate

STARCH ACETATE/ADIPATE

3.8

A gentle modified starch that improves product feel and absorbs excess oil without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincaretexturizer
Read ingredient review

Film Former

Starch Acrylate Copolymer

STARCH/ACRYLATES/ACRYLAMIDE COPOLYMER

3.8

A safe, synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Binder

Starch Tallowate

Starch Tallowate

3.5

Starch Tallowate is a safe, low-irritation binder that helps cosmetics feel smooth and stay together, but it offers no active skincare benefits.

Irritation

low

Source

semi-synthetic

beautyskincarecosmetic
Read ingredient review

Antioxidant

Staunton's Mint Extract

Elsholtzia stauntonii extract

3.8

A gentle botanical extract with antioxidant potential, but research on its specific skin benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

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

beautyskincarehaircare
Read ingredient review

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
Read ingredient review

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
Read ingredient review

Viscosity Controlling Agent

Stearalkonium Hectorite

STEARALKONIUM HECTORITE

4.0

A safe, clay-based thickener that helps keep formulas smooth and stable, but may feel heavy on very oily skin.

Irritation

low

Source

semi-synthetic

beautyskincareviscosity controlling agent
Read ingredient review

Viscosity controlling agent

Stearamide

Stearamide

3.5

Stearamide is a synthetic thickener and stabilizer that helps give creams and lotions a smooth, rich texture with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

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
Read ingredient review

Surfactant

Stearamide DEA

Stearamide DEA

3.5

An effective foam booster and thickener, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Stearamide DEA-Distearate

STEARAMIDE DEA-DISTEARATE

3.5

A synthetic emulsifier that helps blend oil and water in creams, but may be slightly pore-clogging for some skin types.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Foam Booster

Stearamide MEA

STEARAMIDE MEA

3.5

A synthetic foam booster that helps cleansers feel richer and thicker, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Viscosity Controlling

Stearamide MEA-Stearate

STEARAMIDE MEA-STEARATE

3.5

A synthetic thickener and stabilizer that helps give creams a rich texture, but may be too heavy for oily or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Viscosity Increasing Agent

Stearamide MIPA

Stearamide MIPA

3.5

Stearamide MIPA helps thicken and stabilize cleansers, but may be mildly irritating or clog pores for some skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Stearamidoethyl Diethanolamine

STEARAMIDOETHYL DIETHANOLAMINE

3.5

A synthetic foam booster that can improve lather and thickness but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Antistatic Agent

Stearamidoethyl Diethanolamine HCl

STEARAMIDOETHYL DIETHANOLAMINE HCL

3.5

A synthetic conditioning agent that reduces static and softens hair, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincarehair careconditioning agent
Read ingredient review

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

beautyskincarehaircare
Read ingredient review

Surfactant

Stearamidoethyl Ethanolamine

Stearamidoethyl Ethanolamine

3.5

A mild surfactant and foam booster that helps cleansers feel richer, but may be slightly pore-clogging for acne-prone skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

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
Read ingredient review

Surfactant

Stearamidopropyl Betaine

STEARAMIDOPROPYL BETAINE

4.0

A gentle, foam-boosting surfactant that helps cleansers feel creamy and less stripping, but may not suit ultra-sensitive scalps in high concentrations.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

Surfactant

Stearamidopropylamine Oxide

Stearamidopropylamine Oxide

3.8

A gentle surfactant that boosts foam and thickens formulas, but may cause mild dryness in sensitive skin with frequent use.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Stearamine

Stearamine

3.5

Stearamine helps blend oil and water in creams and conditioners, but may be irritating for sensitive skin or scalps.

Irritation

moderate

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

Stearamine Oxide

Stearamine Oxide

3.8

A gentle surfactant that helps create rich foam and thicken formulas, with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Steardimonium Ethyl Cetyl Phosphate

Steardimonium Ethyl Cetyl Phosphate

4.0

A mild emulsifier that stabilizes creams and lotions while adding a silky, non-greasy feel — generally safe and well-tolerated.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

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
Read ingredient review

Emulsifier

Steareth-100

STEARETH-100

3.8

Steareth-100 is a gentle synthetic emulsifier that helps blend oil and water in creams and cleansers, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

Steareth-11

STEARETH-11

4.0

Steareth-11 is a gentle synthetic emulsifier that helps create stable, creamy textures in skincare, but may be less suitable for those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

Steareth-12

STEARETH-12

3.8

A reliable synthetic emulsifier that helps mix water and oil in formulas, generally well-tolerated but may be too heavy for very oily skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

Steareth-12 Stearate

Steareth-12 Stearate

3.8

A reliable synthetic emulsifier that helps create smooth, stable creams and lotions with low irritation potential.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

Steareth-13

STEARETH-13

3.5

Steareth-13 is a gentle synthetic emulsifier that helps stabilize creams and lotions, but it is produced with ethylene oxide, which raises purity concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review