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 1,097
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

Surfactant

Tallamide DEA

Tallamide DEA

3.5

An effective foam booster and thickener, but may cause irritation for sensitive skin and raises some environmental concerns.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Tallow Betaine

Tallow Betaine

4.0

Tallow betaine is a mild, naturally-derived surfactant that cleanses without stripping the skin, making it a good choice for sensitive skin.

Irritation

low

Source

natural

beautyskincaresurfactant
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Surfactant

Tallow Hydroxyethyl Imidazoline

Tallow Hydroxyethyl Imidazoline

3.5

A gentle, animal-derived surfactant that helps cleansers feel less stripping, but may be too heavy for oily or acne-prone skin.

Irritation

low

Source

natural

beautyskincaresurfactant
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Surfactant

Tallowamide DEA

TALLOWAMIDE DEA

3.0

Tallowamide DEA is a foam booster and thickener from animal fat, but it may cause irritation and has raised concerns over potential contamination with cancer-causing impurities.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Foam Booster

Tallowamide MEA

Tallowamide MEA

3.5

A semi-synthetic foam booster from animal fat that can improve lather but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Tallowamidopropyl Betaine

Tallowamidopropyl Betaine

3.8

A mild, animal-derived surfactant that effectively cleanses without stripping the skin, but may not suit vegans or those avoiding animal ingredients.

Irritation

low

Source

natural

beautyskincaresurfactant
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Surfactant

Tallowamidopropylamine Oxide

TALLOWAMIDOPROPYLAMINE OXIDE

3.5

An effective foaming and cleansing agent derived from animal fat, but may cause irritation for sensitive skin and raises ethical concerns for those avoiding animal-derived ingredients.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Tallowaminopropylamine

TALLOWAMINOPROPYLAMINE

3.5

Tallowaminopropylamine is a fatty amine from animal fat that helps condition hair and stabilize formulas, but it may be irritating for sensitive skin and is not suitable for vegans.

Irritation

moderate

Source

natural

beautyskincaresurfactant
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Emulsifier

Talloweth-18

TALLOWETH-18

3.8

Talloweth-18 is an effective emulsifier derived from animal fat, but its moderate irritation and comedogenic potential make it better suited for rinse-off cleansers than leave-on products.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Talloweth-4

TALLOWETH-4

3.5

Talloweth-4 is a functional but controversial emulsifier—effective for cleansing but may cause irritation for sensitive skin and raises ethical concerns due to its animal-derived origin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Talloweth-6

TALLOWETH-6

3.5

Talloweth-6 is a workhorse emulsifier in cleansers, but its animal-derived origin and potential for mild irritation may not suit all preferences.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

Talloweth-7

TALLOWETH-7

3.5

Talloweth-7 is a functional but controversial emulsifier — effective at blending ingredients but derived from animal fat and may cause irritation for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

TEA Perfluoroalkylethyl Phosphate

TEA-C8-18 PERFLUOROALKYLETHYL PHOSPHATE

3.5

A synthetic emulsifier that helps water-resistant formulas spread evenly, but its perfluoroalkyl structure raises environmental persistence concerns.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

TEA-C10-15 Alkyl Sulfate

TEA-C10-15 Alkyl Sulfate

3.5

An effective but potentially drying cleanser that works well for oily skin but may irritate sensitive or dry skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

TEA-C8-10 Alkyl Phosphate

TEA-C8-10 Alkyl Phosphate

4.0

A gentle surfactant that cleans without stripping the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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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

beautyskincarehaircaresurfactant
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Surfactant

TEA-Isostearate

TEA-Isostearate

3.8

TEA-Isostearate is a synthetic emulsifier that helps cleanse and stabilize formulas, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

TEA-Laurate

TEA-Laurate

3.5

TEA-Laurate helps create lather and remove dirt, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

TEA-Laureth-4 Phosphate

TEA-Laureth-4 Phosphate

3.8

A gentle synthetic surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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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-Myristate

TEA-Myristate

3.5

TEA-Myristate helps cleansers foam and mix oil with water, but it may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

TEA-Oleate

TEA-Oleate

3.5

TEA-Oleate is an effective cleanser but can be drying or irritating for sensitive skin, especially in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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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
Read ingredient review

Surfactant

TEA-Perfluorohexyl Ethylphosphate

TEA-PERFLUOROHEXYL ETHYLPHOSPHATES

3.5

A synthetic emulsifier that helps water-resistant formulas spread evenly, but its fluorinated chemistry raises environmental persistence concerns.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

TEA-Stearate

TEA-Stearate

3.5

TEA-Stearate helps cleansers foam and creams stay smooth, but it may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

TEA-Tallate

TEA-TALLATE

3.5

TEA-Tallate helps cleansers foam and remove oil, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Chelating Agent

Tetrapotassium Pyrophosphate

Tetrapotassium Pyrophosphate

3.5

A behind-the-scenes helper that boosts cleansing power and prevents mineral buildup, but is generally safe in rinse-off formulas.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Tri-C12-15 Pareth-10 Phosphate

TRI-C12-15 PARETH-10 PHOSPHATE

3.8

A mild synthetic emulsifier that helps blend oil and water in cleansers, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Tri-C12-15 Pareth-2 Phosphate

TRI-C12-15 PARETH-2 PHOSPHATE

4.0

A mild synthetic emulsifier that helps blend oil and water in cleansers and lotions, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Tri-C12-15 Pareth-6 Phosphate

TRI-C12-15 PARETH-6 PHOSPHATE

3.8

An effective cleansing agent that helps remove dirt and oil, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

Tri-C12-15 Pareth-8 Phosphate

TRI-C12-15 PARETH-8 PHOSPHATE

3.8

A mild synthetic surfactant that helps cleanse without stripping, but may cause irritation for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Triceteareth-4 Phosphate

TRICETEARETH-4 PHOSPHATE

3.8

A mild synthetic emulsifier that helps mix water and oil in products without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Triceteth-5 Phosphate

TRICETETH-5 PHOSPHATE

3.5

A synthetic emulsifier that helps mix oil and water, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

Trideceth-10

TRIDECETH-10

3.5

An effective emulsifier and surfactant, but may cause irritation in sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

Trideceth-10 Phosphate

TRIDECETH-10 PHOSPHATE

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Trideceth-11

TRIDECETH-11

4.0

A gentle synthetic emulsifier that helps mix oil and water in cleansers and lotions, with a low irritation profile.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trideceth-12

Trideceth-12

3.8

A gentle synthetic emulsifier that helps cleansers and lotions mix and rinse cleanly, but may be too stripping for very dry or sensitive skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emulsifier

Trideceth-18

TRIDECETH-18

3.5

Trideceth-18 is a gentle synthetic emulsifier that helps mix water and oil in products, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Trideceth-2

TRIDECETH-2

3.5

Trideceth-2 is a gentle synthetic emulsifier that helps mix oil and water, commonly used in cleansers and shampoos for mild cleansing without stripping.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emulsifier

Trideceth-21

TRIDECETH-21

4.0

A gentle synthetic emulsifier that helps create stable, creamy formulas without heavy residue.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Trideceth-3

TRIDECETH-3

3.5

Trideceth-3 is a synthetic emulsifier that helps mix oil and water, but it may cause mild irritation for sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trideceth-4

TRIDECETH-4

3.8

A mild synthetic emulsifier that helps mix oil and water in cleansers and lotions, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trideceth-5

TRIDECETH-5

3.5

A mild synthetic emulsifier that helps mix oil and water in cleansers and lotions, generally safe but may be drying for very sensitive skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Trideceth-50

Trideceth-50

4.0

A gentle, synthetic emulsifier that helps mix water and oil in cleansers and lotions without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trideceth-6

TRIDECETH-6

4.0

A gentle synthetic emulsifier that helps cleansers and lotions mix oil and water without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trideceth-6 Phosphate

TRIDECETH-6 PHOSPHATE

4.0

A gentle synthetic surfactant that helps cleanse without stripping the skin, often used in mild formulas.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trideceth-8

TRIDECETH-8

3.8

A mild synthetic emulsifier that helps products spread and rinse cleanly, but may be slightly drying for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

Trideceth-8 Carboxylic Acid

TRIDECETH-8 CARBOXYLIC ACID

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

Trideceth-9

Trideceth-9

4.0

A gentle synthetic emulsifier that helps mix oil and water, commonly used in cleansers and shampoos.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trilaneth-4 Phosphate

TRILANETH-4 PHOSPHATE

3.8

A gentle, lanolin-derived emulsifier that helps mix oil and water in cleansers and creams, with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trilaureth-4 Phosphate

TRILAURETH-4 PHOSPHATE

3.8

A mild synthetic surfactant that helps cleansers foam and rinse cleanly, but may be slightly drying for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Trilaureth-9 Citrate

TRILAURETH-9 CITRATE

4.0

A gentle, citrate-based surfactant that cleans without stripping the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emulsifier

Trilaurylamine

TRILAURYLAMINE

3.5

Trilaurylamine is a synthetic emulsifier that helps blend oil and water in rinse-off products, but it may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

TRIOLETH-8 PHOSPHATE

TRIOLETH-8 PHOSPHATE

3.5

A mild synthetic surfactant that helps cleansers foam and rinse cleanly, but may be drying for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Undeceth-11

UNDECETH-11

3.8

A mild synthetic emulsifier that helps products spread and rinse cleanly, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Undeceth-3

UNDECETH-3

4.0

Undeceth-3 is a gentle synthetic surfactant that helps cleansers foam and rinse cleanly without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review