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

Emollient

Stearyl Methicone

Stearyl Methicone

4.2

A gentle silicone that provides a silky, non-greasy feel and helps other ingredients spread evenly on skin and hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Stearyl PG-Dimethylamine

STEARYL PG-DIMETHYLAMINE

4.0

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

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioning Agent

Stigmasteryl Chloride

STIGMASTERYL CHLORIDE

3.5

A gentle plant-derived conditioner that helps soften hair and skin without heavy buildup.

Irritation

low

Source

natural

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Film Former

Styrene/Acrylate Copolymer

HEMA/METHACRYLAMIDOPROPYLTRIMONIUM CHLORIDE/STYRENE COPOLYMER

3.5

A synthetic polymer that helps products stay put, but offers no skin benefit and may feel stiff or heavy on some.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

Styrene/VA Copolymer

STYRENE/VA COPOLYMER

3.8

A reliable film-former that helps products stay put, but it's a synthetic polymer with no skin benefits beyond texture and wear.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair Conditioning Agent

Succinoyl Soy Protein

CETEARAMIDOETHYLDIETHONIUM SUCCINOYL HYDROLYZED SOY PROTEIN

4.0

A gentle, protein-based conditioning ingredient that adds softness and manageability to hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Sulfonated Keratin

SULFONATED KERATIN

4.0

A modified keratin protein that bonds to hair to temporarily fill damage and improve strength and shine.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Hair conditioning agent

Sulfurized Hydrolyzed Corn Protein

SULFURIZED HYDROLYZED CORN PROTEIN

3.8

A gentle, protein-based ingredient that strengthens hair and forms a protective film, but may not suit protein-sensitive hair types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Film Former

Sulfurized Hydrolyzed Zein

SULFURIZED HYDROLYZED ZEIN

3.5

A modified corn protein that may help strengthen hair and form a protective film on skin, but research is limited.

Irritation

low

Source

semi-synthetic

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Conditioning Agent

Sunfloweramidopropyl Dimethylamine

SUNFLOWERSEEDAMIDOPROPYL DIMETHYLAMINE

4.0

A gentle, plant-derived conditioning ingredient that helps soften and detangle hair with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Conditioning Agent

Sunfloweramidopropyl Dimethylamine Lactate

SUNFLOWERSEEDAMIDOPROPYL DIMETHYLAMINE LACTATE

4.0

A gentle, plant-derived conditioning ingredient that softens hair and reduces static, ideal for those seeking a lighter alternative to silicones.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Conditioning Agent

Sunfloweramidopropyl Ethyldimonium Ethosulfate

SUNFLOWERSEEDAMIDOPROPYL ETHYLDIMONIUM ETHOSULFATE

4.0

A mild, sunflower-derived conditioning ingredient that smooths hair and reduces static, suitable for most hair types including sensitive scalps.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Sweet Almond Amino Acids

Prunus Amygdalus Dulcis (Sweet Almond) Amino Acids

4.0

A mild, plant-based amino acid that helps strengthen hair and hydrate skin without irritation.

Irritation

low

Source

natural

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Film Former

Tall Oil Copolymer

Oxidized Tall Oil Acids/Neopentyl Glycol Copolymer

3.8

A film-forming polymer from wood pulp byproducts that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

semi-synthetic

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Antistatic Agent

Tall Oil Imidazolinium Chloride

TALL OIL BENZYL HYDROXYETHYL IMIDAZOLINIUM CHLORIDE

3.0

A conditioning agent that reduces static and improves manageability, but may cause irritation for sensitive scalps at higher concentrations.

Irritation

moderate

Source

semi-synthetic

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Surfactant

Tallow Amidopropyl Dimethylamine

TALLAMIDOPROPYL DIMETHYLAMINE

3.5

A fatty amine conditioner from animal fat that softens hair and skin but may be too heavy for oily or acne-prone types.

Irritation

moderate

Source

natural

beautyskincarehaircareconditioning agent
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Antistatic Agent

Tallow Trihydroxyethylammonium Acetate

Tallow Trihydroxyethylammonium Acetate

3.5

A gentle conditioning ingredient from animal fat that softens hair and reduces static, but may be too heavy for oily or acne-prone skin.

Irritation

low

Source

natural

beautyskincarehaircareconditioning agent
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Antistatic Agent

Tallowalkonium Chloride

TALLOWALKONIUM CHLORIDE

3.5

An effective conditioning and antistatic ingredient derived from animal fat, but may cause irritation or clog pores for sensitive or acne-prone skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Tallowamidopropyl Dimethylamine

TALLOWAMIDOPROPYL DIMETHYLAMINE

3.5

A gentle conditioning ingredient from animal fat that softens hair but may be too heavy for oily scalps or acne-prone skin.

Irritation

low

Source

natural

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Antistatic Agent

Tallowtrimonium Chloride

Tallowtrimonium Chloride

3.8

Tallowtrimonium Chloride is an effective conditioning ingredient derived from animal fats, but it may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

semi-synthetic

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Surfactant

TEA-Cocoyl Hydrolyzed Collagen

TEA-Cocoyl Hydrolyzed Collagen

3.8

A gentle, coconut-derived cleanser that also conditions skin and hair, but may not be ideal for very dry or sensitive scalps in high concentrations.

Irritation

low

Source

semi-synthetic

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Film Former

TEA-Isostearoyl Hydrolyzed Collagen

TEA-ISOSTEAROYL HYDROLYZED COLLAGEN

3.5

A gentle, modified collagen that helps hair and skin feel smooth and conditioned, but its benefits are mostly temporary and surface-level.

Irritation

low

Source

semi-synthetic

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Surfactant

TEA-Lauroyl Hydrolyzed Collagen

TEA-LAUROYL HYDROLYZED COLLAGEN

3.8

A gentle, collagen-derived surfactant that cleans without stripping, making it a good choice for sensitive skin and hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

TEA-Myristoyl Hydrolyzed Collagen

TEA-Myristoyl Hydrolyzed Collagen

3.8

A gentle cleansing and conditioning ingredient derived from collagen, best for rinse-off products like shampoos and body washes.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Surfactant

TEA-Oleoyl Hydrolyzed Collagen

TEA-OLEOYL HYDROLYZED COLLAGEN

3.5

A mild cleansing and conditioning ingredient that can help clean skin and hair without stripping, but may cause irritation for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Hair growth stimulant

Tetraaminopyrimidine Sulfate

TETRAAMINOPYRIMIDINE SULFATE

3.8

A synthetic ingredient that may help reduce hair shedding and support thicker-looking hair, but evidence is still building.

Irritation

low

Source

synthetic

beautyhaircareactive
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Absorbent

Thiosulfate Silica Complex

SODIUM PROPOXYHYDROXYPROPYL THIOSULFATE SILICA

3.5

A hybrid ingredient that combines silica's oil-absorbing power with thiosulfate's antioxidant potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

TIPA-Acrylates Copolymer

TIPA-ACRYLATES/ETHYLHEXYL ACRYLATE COPOLYMER

3.8

A synthetic film-former that helps products stay put longer, but may feel tight or stiff on some skin types.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Emollient

TMP Lauryl Dimethicone

TMP LAURYL DIMETHICONE

4.0

A gentle silicone that helps products spread smoothly and feel silky without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Tricetylmonium Chloride

Tricetylmonium Chloride

3.8

A gentle conditioning ingredient that reduces static and softens hair without heavy buildup.

Irritation

low

Source

synthetic

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Film Former

Trideceth-9 PG-Amodimethicone

Trideceth-9 PG-Amodimethicone

3.8

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

Irritation

low

Source

synthetic

beautyskincarehaircare
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