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 1,749
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 Ingredient

Trimethylbenzenepropanol

Trimethylbenzenepropanol

3.8

A synthetic scent ingredient that adds a floral note but offers no skincare benefit; generally well-tolerated but may irritate sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethylbicyclo Heptenylmethyl Acetate

TRIMETHYLBICYCLO-4-HEPTEN-3-YLMETHYL ACETATE

3.8

A synthetic fragrance compound that adds a pleasant woody-amber scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethylbicyclo Heptylacrylonitrile

TRIMETHYLBICYCLO-3-HEPTYLACRYLONITRILE

3.8

A synthetic scent ingredient that adds a warm amber note to products, but may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Trimethylbicycloheptane

TRIMETHYLBICYCLOHEPTANE

3.5

A synthetic scent ingredient that can give a fresh, cooling feel but may irritate sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethylbicycloheptane-2-Methanol

Trimethylbicycloheptane-2-Methanol

3.8

A synthetic scent ingredient that adds a fresh, cooling note to products, but offers no direct skincare benefit and may be unnecessary for sensitive noses.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Trimethylbicycloheptanol

TRIMETHYLBICYCLO-2-HEPTANOL

3.5

A natural fragrance component that gives a fresh, woody scent but offers no direct skincare benefits.

Irritation

low

Source

natural

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Fragrance

Trimethylbicycloheptanone

Trimethylbicyclo[2.2.1]heptan-2-one

3.5

A fragrance ingredient with a camphor-like scent; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance

Trimethylbicycloheptenol

TRIMETHYLBICYCLO[3.1.1]HEPT-2-EN-2-OL

3.5

A synthetic scent ingredient that adds a fresh, woody aroma but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance component

Trimethylbicycloheptenone

TRIMETHYLBICYCLO[3.1.1]HEPT-3-EN-2-ONE

3.5

A synthetic scent ingredient that adds a fresh, woody note to products but offers no skin benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance ingredient

Trimethylbicycloheptenylmethanol

TRIMETHYLBICYCLO-4-HEPTEN-3-YLMETHANOL

3.5

A synthetic scent ingredient that adds a woody note but offers no skincare benefit; safe at low levels but may cause sensitivity in some.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethylcyclohexaneacetic Acid

TRIMETHYLCYCLOHEXANEACETIC ACID

3.5

A synthetic scent ingredient that adds a pleasant woody note but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Trimethylcyclohexene Methanol

D-Trimethyl-3-Cyclohexene-1-Methanol

3.5

A synthetic fragrance ingredient that adds scent but offers no skincare benefit and may irritate sensitive skin.

Irritation

moderate

Source

synthetic

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Fragrance Ingredient

Trimethylcyclohexene Methyl Acetate

L-Trimethyl-3-Cyclohexene-1-Methyl Acetate

3.5

A synthetic scent ingredient that makes products smell pleasant but offers no skin benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Component

Trimethylcyclohexene-1-Methanol

Trimethylcyclohexene-1-Methanol

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; safe for most people at low concentrations.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethyldecenedione

Trimethyldecenedione

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

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Fragrance Ingredient

Trimethyldodecatrien-3-yl Acetate

TRIMETHYLDODECATRIEN-3-YL ACETATE

3.5

A synthetic fragrance ingredient that adds scent to products; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethyldodecatrienol

TRANS-TRIMETHYLDODECATRIEN-3-OL

3.5

A synthetic scent ingredient that can make products smell pleasant but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethylhexyl Formate

Trimethylhexyl Formate

3.5

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

Irritation

low

Source

synthetic

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Fragrance

Trimethylnorbornan-2-one

Trimethylnorbornan-2-one

3.5

A natural fragrance compound that adds a woody, camphor scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

natural

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Fragrance Ingredient

Trimethylpentadecatrien-2-one

Trimethylpentadecatrien-2-one

3.5

A synthetic fragrance ingredient that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance ingredient

Trimethyltricyclododecanol

Trimethyltricyclododecanol

3.5

A synthetic fragrance ingredient that adds a woody, warm scent; generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethyltricyclododecanyl Acetate

TRIMETHYLTRICYCLODODECANYL ACETATE

3.8

A synthetic scent ingredient that adds a warm, woody note to products, but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethyltricyclododecanyl Formate

TRIMETHYLTRICYCLODODECANYL FORMATE

3.5

A synthetic scent ingredient that adds a warm, woody note to products; generally considered safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Trimethylundecadienal

Trimethylundecadienal

3.5

A synthetic scent ingredient that adds a fresh note but may irritate sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethylundecadienol

Trimethylundecadienol

3.5

Trimethylundecadienol is a synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Trimethylundecenal

Trimethylundecenal

3.5

A synthetic peach-scented fragrance ingredient that adds a pleasant aroma but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

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Fragrance Ingredient

Trimethylvinylcyclohexylmethyl Acetate

TRIMETHYL-3-METHYLVINYL-4-VINYLCYCLOHEXYLMETHYL ACETATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Tuberose Flower Oil

POLIANTHES TUBEROSA FLOWER OIL

3.8

Tuberose flower oil adds a luxurious floral scent to products but may cause irritation in sensitive skin and has limited research on skin benefits beyond fragrance.

Irritation

moderate

Source

natural

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Fragrance Ingredient

Undecanal

UNDECANAL

3.5

Undecanal is a synthetic fragrance compound that adds a fresh citrus note but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

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Fragrance Ingredient

Undecenal Cyanoacetate

UNDECENAL/CYANO-ACETATIC ACID

3.5

A synthetic fragrance ingredient that adds a fresh scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Undecylenal

UNDECYLENAL

3.5

Undecylenal is a synthetic fragrance ingredient that adds a fresh scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

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Fragrance Component

Valencene

Valencene

3.8

Valencene is a natural citrus-derived fragrance ingredient with mild antioxidant potential, but its main role in skincare is scent rather than active treatment.

Irritation

low

Source

natural

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Fragrance

Valencia Orange Peel Oil

Citrus Sinensis (Valencia) Peel Oil Expressed

3.8

Valencia orange peel oil adds a bright citrus scent and mild astringency, but can be irritating for sensitive skin, especially in sunlight.

Irritation

moderate

Source

natural

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Fragrance Ingredient

Valeraldehyde

Valeraldehyde

3.0

Valeraldehyde is a synthetic fragrance compound that adds a fruity scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Valeraldehyde Hexyleneglycol Acetal

Valeraldehyde Hexyleneglycol Acetal

3.5

A synthetic fragrance ingredient that adds a fresh scent but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Valeric Acid

Valeric Acid

3.5

Valeric acid is a naturally occurring fatty acid used mainly for its scent and to adjust product pH, but it can be irritating at higher concentrations.

Irritation

moderate

Source

natural

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Fragrance

Vanilla Fruit Oil

Vanilla Planifolia Fruit Oil

3.8

Vanilla Fruit Oil adds a warm, comforting scent and mild antioxidant benefits to skincare, but its fragrance components can irritate sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Vanillin

Vanillin

3.8

Vanillin adds a warm vanilla scent to skincare and has mild antioxidant activity, but it is primarily a fragrance ingredient with limited skin benefits.

Irritation

low

Source

semi-synthetic

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Fragrance Ingredient

Vanillyl Isobutyrate

4-FORMYL-2-METHOXYPHENYL ISOBUTYRATE

3.5

A synthetic vanilla-like fragrance ingredient that adds scent but offers no skin benefit; generally safe at low levels but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Veratraldehyde

VERATRALDEHYDE

3.8

Veratraldehyde is a synthetic fragrance ingredient that adds a sweet, vanilla-like scent to products; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Veratrole

Veratrole

3.5

Veratrole is a synthetic fragrance ingredient that adds a sweet, woody scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance

Verbena Leaf Absolute

VERBENA OFFICINALIS LEAF ABSOLUTE

3.8

Verbena leaf absolute adds a fresh lemon-like scent to skincare, but its strong fragrance can be irritating for sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Verbena Leaf Oil

VERBENA OFFICINALIS LEAF RECTIFIED OIL

3.8

Verbena leaf oil adds a pleasant citrus scent to products but can be irritating for sensitive skin and has limited skincare research.

Irritation

moderate

Source

natural

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Fragrance Ingredient

Verdyl Acetate

Verdyl Acetate

3.5

Verdyl Acetate is a synthetic fragrance ingredient that adds a fresh, woody scent; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Vernaldehyde

VERNALDEHYDE

3.5

Vernaldehyde is a synthetic fragrance ingredient that adds a fresh floral scent, but it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

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Fragrance

Vetiver Root Oil

Vetiveria Zizanoides Root Oil

3.8

Vetiver root oil adds a warm, earthy fragrance to products and may offer mild soothing benefits, but it can be irritating for sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Vetiverol

Vetiverol

4.0

Vetiverol is a natural, soothing fragrance ingredient with antioxidant benefits, generally safe for most skin types.

Irritation

low

Source

natural

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Fragrance

Vetiveryl Acetate

VETIVERYL ACETATE

4.0

A pleasant, woody-scented fragrance ingredient that is generally well-tolerated but offers no direct skin benefit beyond scent.

Irritation

low

Source

semi-synthetic

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Fragrance

Vietnamese Coriander Oil

Polygonum odoratum oil

3.5

A fragrant essential oil with some antimicrobial potential, but limited research on skin benefits and a moderate risk of irritation for sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Virginian Juniper Oil

Juniperus Virginiana Oil

3.8

Virginian Juniper Oil can help balance oily skin and fight acne-causing bacteria, but its strong fragrance and potential for irritation mean it's best for those without sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Virginian Juniper Wood Oil

Juniperus Virginiana Wood Oil

3.8

A fragrant wood oil that adds a warm, woody scent to products and may offer mild astringent benefits, but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Water Mint Leaf Oil

MENTHA AQUATICA LEAF OIL

3.8

Water mint leaf oil adds a fresh, herbal scent and mild skin-conditioning benefits, but can be irritating for sensitive skin due to its essential oil content.

Irritation

moderate

Source

natural

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Fragrance

Water Mint Oil

Mentha Aquatica Flower/Leaf/Stem Oil

3.8

Water mint oil adds a fresh scent and mild antimicrobial benefits, but can be irritating for sensitive skin at high concentrations.

Irritation

moderate

Source

natural

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Fragrance

Western Red Cedar Stem Oil

Thuja Plicata Stem Oil

3.5

A fragrant tree oil with some antimicrobial potential, but limited research and a moderate risk of skin irritation mean it's best used in low concentrations and avoided by sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Western Red Cedar Wood Oil

Thuja Plicata Wood Oil

3.5

A fragrant wood oil with some antimicrobial potential, but limited research on skin benefits and a moderate risk of irritation for sensitive skin.

Irritation

moderate

Source

natural

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