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

Dimethyl Octanenitrile

3,7-DIMETHYL-OCTANENITRILE

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Octenol

2,6-DIMETHYL-7-OCTEN-2-OL

3.5

A synthetic scent ingredient that adds a fresh, citrusy note but offers no skincare benefit and may be a concern for those sensitive to fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Octyl Acetate

3,6-DIMETHYL-3-OCTYL ACETATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Oxalate

Dimethyl Oxalate

2.5

Dimethyl oxalate is a synthetic ester used mainly as a fragrance ingredient; it has limited direct skincare benefits and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Dimethyl Phenethyl Butyrate

DIMETHYL PHENETHYL BUTYRATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylbutanol

Dimethyl Phenylbutanol

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylethyl Carbinyl Acetate

DIMETHYL PHENYLETHYL CARBINYL ACETATE

3.5

A synthetic fragrance ingredient that adds a floral, rosy scent; generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylpropanol

Dimethyl Phenylpropanol

3.5

A synthetic floral scent ingredient that is generally considered safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylpropanol Isobutyrate

1,1-DIMETHYL-3-PHENYLPROPYL ISOBUTYRATE

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

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenyltetrahydrofuran

2,4-DIMETHYL-4-PHENYLTETRAHYDROFURAN

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Vinyl Heptenol

3,6-DIMETHYL-3-VINYLHEPT-5-EN-2-OL

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Vinylhexenal

2,5-DIMETHYL-2-VINYLHEX-4-ENAL

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Vinyloctenol

4,7-DIMETHYL-4-VINYLOCT-6-EN-3-OL

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl-3-Butenyl Isobutyrate

DIMETHYL-3-BUTENYL ISOBUTYRATE

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

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl-4-Isoheptenal Dimethyl Acetal

DIMETHYL-4-ISOHEPTENAL DIMETHYL ACETAL

3.5

A synthetic fragrance ingredient that adds a fresh scent but offers no skin benefit and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl-5-Hexenyl Acetate

DIMETHYL-5-HEXENYL ACETATE

3.5

A synthetic fragrance compound that adds a fruity note to products, but offers no skincare benefit and may be a concern for those with fragrance sensitivity.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbenzyl Carbinol

DIMETHYLBENZYL CARBINOL

3.5

A synthetic floral scent ingredient that adds a pleasant rose note but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbenzyl Carbinyl Acetate

DIMETHYLBENZYL CARBINYL ACETATE

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbenzyl Carbinyl Propionate

DIMETHYLBENZYL CARBINYL PROPIONATE

3.5

A synthetic fragrance ingredient that adds a floral, fruity scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Dimethylbicyclohept-2-ylethanone

DIMETHYLBICYCLOHEPT-2-YLETHANONE

3.5

A synthetic fragrance compound that adds scent to products but offers no skincare benefit; safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbicycloheptenylethanone

DIMETHYLBICYCLO-5-HEPTEN-2-YLETHANONE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbicycloheptyl Ethanone

DIMETHYLBICYCLOHEPTYL ETHANONE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbicycloheptyl Methylcyclohexanone

DIMETHYLBICYCLOHEPT-2-YL-METHYL-2-METHYLCYCLOHEXANONE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Dimethylbicycloheptylidene Ethanol

2-DIMETHYLBICYCLOHEPT-2-YLIDENE ETHANOL

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbicycloheptylidene Ethyl Acetate

TRANS-DIMETHYLBICYCLOHEPT-2-YLIDENE-ETHYL ACETATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbicyclooctanone Oxime

DIMETHYLBICYCLO-8-OCTANONE OXIME

3.5

A synthetic fragrance compound that adds a fresh, woody scent but offers no skincare benefits and may be a concern for those avoiding synthetic fragrances.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylcyclohexene Methanol

3,5-DIMETHYLCYCLOHEXENE-1-METHANOL

3.5

A synthetic fragrance ingredient that adds scent but may cause irritation in sensitive skin, especially at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylcyclohexenyl Butenyl Ketone

DIMETHYLCYCLOHEXENYL 3-BUTENYL KETONE

3.5

A synthetic fragrance compound that adds scent but offers no skin benefit and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylcyclohexenyl Tert-Butyl Ketone

DIMETHYLCYCLOHEXENYL TERT-BUTYL KETONE

3.5

A synthetic fragrance ingredient that adds scent but offers no skin benefit and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylcyclohexyl Methyl Ketone

DIMETHYLCYCLOHEXYL METHYL KETONE

3.5

A synthetic scent ingredient that adds a pleasant floral-herbal note but offers no skincare benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylcyclohexylmethyl Acetate

3,5-DIMETHYLCYCLOHEXYLMETHYL ACETATE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Dimethylcyclopentanedione

3,4-DIMETHYLCYCLOPENTANE-1,2-DIONE

3.5

A synthetic fragrance ingredient that adds a sweet, maple-like scent; generally safe at low levels but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylheptenal

Dimethylheptenal

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylheptenol

Dimethylheptenol

3.5

A synthetic scent ingredient that adds a fresh floral note but offers no skincare benefits; safe for most but may trigger allergies in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylhexyl Acetate

DIMETHYLHEXYL ACETATE

3.5

Dimethylhexyl Acetate is a synthetic fragrance ingredient with a low irritation risk, but it offers no direct skincare benefits beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Dimethylhydroxy Furanone

Dimethylhydroxy Furanone

3.5

A synthetic scent ingredient with mild antioxidant potential, but its main role is fragrance, not active skincare.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylisobutyl Methylcyclohexanone

DIMETHYLISOBUTYL METHYLCYCLOHEXANONE

3.5

A synthetic fragrance ingredient that adds a pleasant floral note but offers no skincare benefit and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylphenyl Carbinol

Dimethylphenyl Carbinol

4.0

A common synthetic fragrance ingredient that is generally well-tolerated but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylphenyl Methyl Ketone

DIMETHYLPHENYL METHYL KETONE

3.5

A synthetic fragrance compound that adds scent but offers no skin benefit and may cause irritation for sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Dimethylpyrazine

2,5-DIMETHYLPYRAZINE

3.5

A synthetic fragrance compound that adds a nutty, roasted scent to products; generally safe at low levels but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylpyridine

2,4-DIMETHYLPYRIDINE

2.5

A synthetic fragrance compound with limited cosmetic safety data; best avoided by sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylspiroundecanone

DIMETHYLSPIROUNDECANONE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylthiazole HBr

2-AMINO-4,5-DIMETHYLTHIAZOLE HBR

2.0

A synthetic fragrance compound with limited safety data; best avoided by those with sensitive skin or fragrance allergies.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylundecadienal

6,10-DIMETHYLUNDECA-1,5-DIENAL

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Dipterocarpus Balsam Oil

Dipterocarpus Turbinatus Balsam Oil

3.5

A natural balsam oil with a warm, woody scent that may soothe skin but can cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Distilled Lime Peel Oil

Citrus Aurantifolia Peel Oil Distilled

3.8

A natural citrus oil that adds a fresh scent and mild antimicrobial benefits, but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Component

Dodecahydro Tetramethyl Epoxynaphthoxepin

DODECAHYDRO-TETRAMETHYL-EPOXYNAPHTHOXEPIN

3.5

A synthetic scent ingredient that adds a warm, woody note to products, but offers no skincare benefit and may be a concern for those avoiding fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dodecahydrocyclododecafuran

DODECAHYDROCYCLODODECAFURAN

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dodecanenitrile

DODECANENITRILE

3.5

Dodecanenitrile is a synthetic fragrance ingredient that adds a fresh, citrusy scent, but it offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dodecyldihydrofuranone

3-DODECYLDIHYDROFURANONE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Douglas Fir Branch/Leaf Oil

Pseudotsuga menziesii branch/leaf oil

3.8

A fragrant essential oil from Douglas fir that adds a woodsy scent and may offer mild antioxidant benefits, but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Dwarf Pine Oil

Pinus Pumilio Branch/Leaf Oil

3.8

Dwarf pine oil adds a fresh, woodsy scent and may help clarify oily or congested skin, but it can be irritating for sensitive skin types.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Dwarf Pine Twig Leaf Oil

Pinus Pumila Twig Leaf Oil

3.8

A fragrant essential oil from dwarf pine that adds a fresh, woodsy scent to products, but may cause irritation in sensitive skin if used at high levels.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Epoxycyclododecane

EPOXYCYCLODODECANE

3.5

Epoxycyclododecane is a synthetic fragrance ingredient that adds a woody scent, but it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Epoxyguaiène

Epoxyguaiène

3.5

Epoxyguaiène is a rare, natural fragrance ingredient that adds a woody, ambery note and helps stabilize scent blends, but it's not a functional skincare active.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review