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

Epoxypinane

Epoxypinane

3.5

Epoxypinane is a synthetic pine-scented fragrance ingredient with limited safety data; it may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance

Eremanthus Erythropappus Leaf Oil

EREMANTHUS ERYTHROPAPPUS LEAF OIL

3.8

A fragrant botanical oil with potential soothing benefits, but limited research and a risk of skin irritation for sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Eremophila Mitchellii Wood Oil

EREMOPHILA MITCHELLII WOOD OIL

3.8

A fragrant Australian wood oil with a calming scent, but limited research on direct skincare benefits and moderate irritation potential.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance ingredient

Estratetraenol

Estratetraenol

2.5

Estratetraenol is a synthetic steroid with limited cosmetic research; its primary use is in fragrance or pheromone products, not proven for skincare benefits.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethoxy Propenylphenol

ETHOXY-PROPENYLPHENOL

3.0

A synthetic fragrance ingredient with limited safety data; best for those who tolerate synthetic scents.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethoxyheptyl Bicyclooctanone

ETHOXYHEPTYL BICYCLOOCTANONE

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
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Fragrance Ingredient

Ethyl 2-Acetylheptanoate

ETHYL 2-ACETYLHEPTANOATE

3.5

A synthetic fragrance ester that adds a fruity or floral note to products; generally safe at low levels but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl 2-Acetyloctanoate

ETHYL 2-ACETYLOCTANOATE

3.5

Ethyl 2-Acetyloctanoate is a synthetic fragrance ingredient with limited safety data; it is generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl 2-Methoxybenzyl Ether

ETHYL 2-METHOXYBENZYL ETHER

3.5

A synthetic fragrance ingredient with limited safety data; generally considered low-risk at typical use levels but best avoided by those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl 2-Methylbutyrate

ETHYL 2-METHYLBUTYRATE

4.0

A fruity-smelling ester used for scent; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance ingredient

Ethyl 2-Methylpent-3-Enoate

ETHYL 2-METHYLPENT-3-ENOATE

3.5

A synthetic fragrance ingredient that adds a fruity note to products; generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl 2-Methylpent-4-Enoate

ETHYL 2-METHYLPENT-4-ENOATE

3.5

A synthetic fragrance ester that adds a fruity note to products; generally considered safe at low concentrations but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance ingredient

Ethyl 2-Octenoate

ETHYL 2-OCTENOATE

3.5

Ethyl 2-Octenoate is a synthetic fragrance ingredient that adds a fruity, floral note to products; it is generally safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl 3-Hydroxyhexanoate

Ethyl 3-Hydroxyhexanoate

3.5

A synthetic fragrance ester that adds a fruity scent to products; generally safe but may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl 3-Phenylglycidate

ETHYL 3-PHENYLGLYCIDATE

3.5

Ethyl 3-Phenylglycidate is a synthetic fragrance compound that adds a sweet, fruity note to products but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Acetoacetate

Ethyl Acetoacetate

3.5

Ethyl Acetoacetate is a synthetic ester that adds scent and helps dissolve other ingredients, but it offers no direct skin benefit and may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Acetoacetate Ethylene Glycol Ketal

ETHYL ACETOACETATE ETHYLENE GLYCOL KETAL

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Anisate

Ethyl Anisate

3.8

Ethyl Anisate is a gentle, naturally derived fragrance ingredient that adds a sweet, anise-like scent to products, but it offers no direct skincare benefits.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Anthranilate

Ethyl Anthranilate

3.5

Ethyl Anthranilate is a synthetic fragrance ingredient that adds a floral, grape-like scent but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Benzoate

Ethyl Benzoate

3.5

Ethyl Benzoate is a synthetic fragrance ingredient that helps scent products and dissolve other ingredients, but it may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Ethyl Beta-Naphthyl Ether

ETHYL BETA-NAPHTHYL ETHER

3.5

A synthetic fragrance ingredient that adds a sweet floral scent; generally safe at low levels but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Ethyl Butyl Valerolactone

Ethyl Butyl Valerolactone

3.5

A synthetic fragrance ingredient that adds a pleasant scent but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance

Ethyl Butyrate

ETHYL BUTYRATE

3.8

Ethyl butyrate is a safe, fruity fragrance ingredient that adds a pleasant scent but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Ethyl Cinnamate

Ethyl Cinnamate

3.8

Ethyl Cinnamate is a gentle, naturally derived fragrance ingredient that adds a pleasant scent to products but offers no active skincare benefits.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Citral

ETHYL CITRAL

3.5

Ethyl Citral is a synthetic citrus fragrance that can cause skin irritation or allergies in sensitive individuals, especially at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Crotonate

Ethyl Crotonate

3.5

Ethyl Crotonate is a synthetic fragrance ingredient that adds a fruity, rum-like scent to products, but it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Cyclohexylacetate

ETHYL CYCLOHEXYLACETATE

3.5

Ethyl Cyclohexylacetate is a synthetic fragrance ingredient that adds a pleasant scent to products, but it offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Cyclopentenolone

3-ETHYLCYCLOPENTANE-1,2-DIONE

3.5

A synthetic fragrance ingredient that adds a sweet, caramel-like scent but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Ethyl Dimethyl Bicyclooctanol

8-ETHYL-1,5-DIMETHYLBICYCLO-8-OCTANOL

3.5

A synthetic fragrance ingredient that adds scent to products but offers no skincare benefits; safe at low levels but may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Dimethyldioxolane-2-Acetate

ETHYL DIMETHYLDIOXOLANE-2-ACETATE

3.5

A synthetic fragrance ingredient that adds a fruity scent but offers no skincare benefits and may be best avoided by those sensitive to fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Ethyl Dimethylhydrocinnamal

ETHYL 2,2-DIMETHYLHYDROCINNAMAL

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Dimethyloctadienoate

Ethyl Dimethyloctadienoate

3.5

Ethyl Dimethyloctadienoate is a synthetic scent ingredient that adds a fruity note to products, but it offers no skincare benefits and may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Dimethyloctenal

3-ETHYL-3,7-DIMETHYLOCT-6-ENAL

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Dimethylpyrazine

3-ETHYL-2,5-DIMETHYLPYRAZINE

3.5

A synthetic fragrance compound that adds a nutty, roasted scent 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 Ingredient

Ethyl Dioxaspiro Undecene

3-ETHYL-2,4-DIOXASPIRO(5.5)UNDEC-8-ENE

3.5

A synthetic scent ingredient that makes products smell pleasant but offers no skin benefit and may irritate sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Ethyldimethylcyclohexene-1-Carboxylate

ETHYL ETHYLDIMETHYLCYCLOHEXENE-1-CARBOXYLATE

3.5

A synthetic fragrance compound that adds scent but offers no skincare benefits; safe for most people but may cause reactions in those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Ethyltrimethylcyclohexenecarboxylate

ETHYL ETHYLTRIMETHYLCYCLOHEXENECARBOXYLATE

3.5

A synthetic fragrance compound that adds scent but offers no skincare benefit; generally safe at low levels but may irritate sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Geranyl Ether

ETHYL GERANYL ETHER

3.5

Ethyl Geranyl Ether is a synthetic fragrance ingredient that adds a fresh, floral scent, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance ingredient

Ethyl Heptanoate

Ethyl Heptanoate

3.5

Ethyl Heptanoate is a synthetic ester that adds a fruity, wine-like scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Hexahydro Benzofuranone

3-ETHYLHEXAHYDRO-3H-BENZOFURAN-2-ONE

3.5

A synthetic scent ingredient that adds a sweet, creamy note 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

Ethyl Hexanoate

ETHYL HEXANOATE

4.0

Ethyl Hexanoate is a safe, widely used fragrance ingredient that adds a fruity scent but offers no skincare benefits.

Irritation

low

Source

synthetic

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Fragrance Ingredient

Ethyl Hydroxy Methyl Furanone

2-ETHYL-4-HYDROXY-5-METHYLFURAN-3(2H)-ONE

3.5

A synthetic fragrance ingredient that adds a sweet, caramel-like scent to products; generally safe at low levels but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Hydroxy Methylfuranone

5-ETHYL-4-HYDROXY-2-METHYLFURAN-3(2H)-ONE

3.5

A synthetic fragrance ingredient that adds a sweet, caramel-like scent to products; generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Hydroxyheptyl Ketone

ETHYL HYDROXYHEPTYL KETONE

3.5

Ethyl Hydroxyheptyl Ketone is a synthetic fragrance ingredient with limited published safety data, but it is generally considered safe at the low levels used in cosmetics.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Hydroxypyrone

Ethyl Hydroxypyrone

3.5

Ethyl Hydroxypyrone is a synthetic fragrance and skin-conditioning agent that adds a sweet, caramel-like scent to products but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Isobutyrate

ETHYL ISOBUTYRATE

3.5

Ethyl Isobutyrate is a synthetic fragrance ingredient that adds a fruity, rum-like scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Isopropyl Bicycloheptene Carboxylate

ETHYL ISOPROPYL-BICYCLOHEPTENE-2-CARBOXYLATE

3.5

A synthetic fragrance ingredient that adds scent 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 Ingredient

Ethyl Isovalerate

ETHYL ISOVALERATE

3.5

Ethyl Isovalerate is a synthetic fragrance ingredient that adds a fruity, apple-like scent to products; it is generally considered safe at low concentrations but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Linalool

ETHYL LINALOOL

4.0

Ethyl Linalool is a synthetic scent ingredient that gives a floral, lavender-like aroma, but it may cause skin reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Methoxy Bicycloheptane

2-ETHYL-5-METHOXY-BICYCLOHEPTANE

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Methoxy Tricycloheptane

1-ETHYL-3-METHOXY-TRICYCLOHEPTANE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Methyl Nonenoic Acid

3-ETHYL-2-METHYLNON-2-ENOIC ACID

3.5

A synthetic fragrance ingredient with limited safety data; best for those who tolerate synthetic scents well.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance

Ethyl Methyl Pyrazine

2-ETHYL-3-METHYLPYRAZINE

3.5

A synthetic fragrance compound that adds a nutty, roasted scent but offers no skin benefit beyond smell.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Methylbutenyl Hexenol

2-ETHYL-2-(3-METHYLBUT-2-ENYL)HEX-3-ENOL

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Methylbutyl Ketoxime

ETHYL METHYLBUTYL KETOXIME

3.0

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Ethyl Methyloctenol

6-ETHYL-3-METHYLOCT-5-ENOL

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

Ethyl Neryl Ether

ETHYL NERYL ETHER

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
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