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

Antimicrobial

Triclosan

Triclosan

2.5

Triclosan is an effective antimicrobial but has raised safety and environmental concerns, leading to restricted use in many regions.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Skin Conditioning Agent

Tricyclodecane Dimethanol

TRICYCLODECANE-4,8-DIMETHANOL

3.8

A synthetic skin-conditioning ingredient that improves product feel without major safety concerns.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Emollient

Tricyclodecanemethyl Isostearate

TRICYCLODECANEMETHYL ISOSTEARATE

4.0

A lightweight synthetic emollient that helps skin feel smooth and soft without clogging pores, commonly used in makeup and moisturizers.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Tricyclodecanone

TRICYCLODECANE-8-ONE

3.5

A synthetic scent ingredient that adds a fresh, woody note but offers no skincare benefits and may be unnecessary for sensitive noses.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Tricyclodecenyl Propionate

TRICYCLODECENYL PROPIONATE

3.8

A synthetic scent ingredient that adds a pleasant fragrance but offers no skincare benefit; safe for most people but may cause reactions in those sensitive to fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Tricyclodecylidene Butanal

TRICYCLODECYLIDENE BUTANAL

3.5

A synthetic fragrance compound that provides a pleasant woody-floral scent, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Tridec-2-enenitrile

TRIDEC-2-ENENITRILE

3.5

A synthetic fragrance ingredient that adds a fresh, citrusy scent; generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Tridecan-2-One

TRIDECAN-2-ONE

3.5

Tridecan-2-One is a synthetic fragrance ingredient with a low irritation risk, but it offers no skincare benefits beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Tridecanal

TRIDECANAL

3.5

Tridecanal is a synthetic fragrance ingredient that adds a fresh, citrusy note to products, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Tridecane

TRIDECANE

3.8

Tridecane is a gentle, lightweight emollient that helps products glide on smoothly without a greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Tridecenal

TRIDECENAL

3.5

Tridecenal is a synthetic fragrance compound that adds a fresh, citrus scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

Surfactant

Trideceth-15 Carboxylic Acid

TRIDECETH-15 CARBOXYLIC ACID

4.0

A gentle, non-stripping cleansing ingredient that helps remove impurities while maintaining skin comfort.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

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
Read ingredient review

Surfactant

Trideceth-19 Carboxylic Acid

TRIDECETH-19 CARBOXYLIC ACID

4.0

A gentle synthetic surfactant that helps cleanse without stripping the skin, commonly found in mild cleansers.

Irritation

low

Source

synthetic

beautyskincarecleansing agent
Read ingredient review

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
Read ingredient review

Surfactant

Trideceth-20

Trideceth-20

4.0

A gentle, water-soluble surfactant that helps cleanse without stripping the skin’s natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleansingemulsifier
Read ingredient review

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
Read ingredient review

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-3 Carboxylic Acid

TRIDECETH-3 CARBOXYLIC ACID

4.0

A gentle synthetic surfactant that effectively cleanses without stripping the skin's natural moisture barrier.

Irritation

low

Source

synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Trideceth-3 Phosphate

TRIDECETH-3 PHOSPHATE

3.8

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

Irritation

moderate

Source

synthetic

beautyskincarecleansing
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-4 Carboxylic Acid

TRIDECETH-4 CARBOXYLIC ACID

4.0

A gentle, semi-synthetic surfactant that helps cleanse without stripping the skin, making it a good choice for sensitive skin formulas.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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

Emulsifier

Trideceth-7

TRIDECETH-7

4.0

Trideceth-7 is a gentle synthetic emulsifier that helps mix water and oil in skincare products, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

Trideceth-7 Carboxylic Acid

TRIDECETH-7 CARBOXYLIC ACID

4.0

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

Irritation

low

Source

synthetic

beautyskincarecleansing
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
Read ingredient review

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
Read ingredient review

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

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
Read ingredient review

Emollient

Tridecyl Alcohol

TRIDECYL ALCOHOL

4.0

A gentle fatty alcohol that softens skin and improves product texture without common irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Behenate

Tridecyl Behenate

4.2

A gentle, non-greasy emollient that softens skin and improves product texture with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Cocoate

TRIDECYL COCOATE

4.3

A gentle, plant-based emollient that hydrates without greasiness, suitable for most skin types including sensitive and oily skin.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Erucate

Tridecyl Erucate

4.0

Tridecyl Erucate is a gentle, non-greasy emollient that helps soften and smooth the skin without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Ethylhexanoate

Tridecyl Ethylhexanoate

4.0

A lightweight synthetic emollient that softens skin without clogging pores, ideal for oily and combination skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Isononanoate

TRIDECYL ISONONANOATE

4.0

A lightweight synthetic emollient that softens skin without clogging pores, ideal for oily or combination skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Laurate

Tridecyl Laurate

4.0

A lightweight, non-greasy emollient that helps soften skin and improve product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Myristate

Tridecyl Myristate

3.8

Tridecyl Myristate is a reliable emollient that softens skin but may clog pores for acne-prone individuals.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Neopentanoate

TRIDECYL NEOPENTANOATE

4.0

A lightweight synthetic emollient that softens skin without clogging pores, ideal for oily or acne-prone types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Skin Conditioning Agent

Tridecyl Salicylate

TRIDECYL SALICYLATE

3.8

A gentle, oil-soluble salicylate ester that helps smooth skin texture without the irritation often linked to salicylic acid.

Irritation

low

Source

semi-synthetic

beautyskincareexfoliant
Read ingredient review

Emollient

Tridecyl Stearate

TRIDECYL STEARATE

4.0

Tridecyl Stearate is a gentle emollient that helps soften and smooth the skin without feeling greasy.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Stearoyl Stearate

TRIDECYL STEAROYL STEARATE

4.0

A gentle, non-greasy emollient that helps soften skin and improve product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tridecyl Trimellitate

TRIDECYL TRIMELLITATE

4.0

Tridecyl Trimellitate is a lightweight synthetic emollient that helps skincare products feel silky and spread smoothly without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Antioxidant

Trientalis Europaea Flower Extract

Trientalis Europaea Flower Extract

3.8

A gentle botanical extract with antioxidant and soothing potential, but research is limited and benefits are not well-established.

Irritation

low

Source

natural

beautyskincarebotanical extract
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pH Adjuster

Triethanolamine

Triethanolamine

3.5

Triethanolamine is a common pH adjuster that helps formulas feel balanced, but it can be irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Emulsifier

Triethanolamine Sesquistearate

Triethanolamine Sesquistearate

3.8

A reliable emulsifier that helps create smooth, stable creams and lotions, but may cause mild irritation in sensitive skin at high concentrations.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surface modifier

Triethoxycaprylylsilane

TRIETHOXYCAPRYLYLSILANE

3.8

A synthetic silicone used to coat pigments and powders, making them smoother, more water-resistant, and easier to blend.

Irritation

low

Source

synthetic

beautyskincarecosmetic ingredient
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