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

Antioxidant

Methoxytrimethylphenyl Dihydroxyphenyl Propanol

Methoxytrimethylphenyl Dihydroxyphenyl Propanol

3.8

A synthetic antioxidant that may help protect skin from oxidative damage, but research is still early and it's less common than established antioxidants like vitamin C or E.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Methyl 2-Octynoate

Methyl 2-Octynoate

3.5

A synthetic fragrance compound that adds a violet scent but may cause irritation in sensitive individuals, especially at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl 2,6-Dihydroxybenzoate

METHYL 2,6-DIHYDROXYBENZOATE

3.5

Methyl 2,6-dihydroxybenzoate is a synthetic fragrance and preservative helper that can be irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrancepreservative
Read ingredient review

Antioxidant

Methyl 3-Methylresorcylate

Methyl 3-Methylresorcylate

3.8

A synthetic antioxidant that may help protect skin from environmental stress, but research on its efficacy in cosmetics is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Methyl 3-Nonenoate

METHYL 3-NONENOATE

3.5

Methyl 3-Nonenoate is a synthetic fragrance ingredient that adds a fresh, fruity scent to products, but offers no skincare benefits beyond fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl 4-T-Butylbenzoate

METHYL 4-T-BUTYLBENZOATE

3.5

A synthetic fragrance ingredient with low irritation risk but limited skin benefit beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin Conditioning

Methyl Abietate

Methyl Abietate

3.8

A gentle, plant-derived ester that helps products feel smooth and stay put on skin, but it's not a star hydrator or active.

Irritation

low

Source

natural

beautyskincarefilm-former
Read ingredient review

Solvent

Methyl Acetate

METHYL ACETATE

3.0

Methyl acetate is an effective solvent for removing nail polish, but it can be drying and irritating if used frequently or on sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Emollient

Methyl Acetyl Ricinoleate

METHYL ACETYL RICINOLEATE

4.0

A gentle, castor oil-derived emollient that softens skin and improves product feel without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Methyl Acetylaminobenzoate

METHYL ACETYLAMINOBENZOATE

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

Soothing Agent

Methyl Acetylglycyrrhetinoyl Hydroxyprolinate

METHYL ACETYLGLYCYRRHETINOYL HYDROXYPROLINATE

4.0

A gentle, multi-tasking ingredient that combines soothing properties from licorice root with collagen-supporting amino acids, ideal for sensitive or aging skin.

Irritation

low

Source

semi-synthetic

beautyskincaresoothing agent
Read ingredient review

Solvent

Methyl Alcohol

METHYL ALCOHOL

1.5

Methyl alcohol is a harsh solvent that can be drying and irritating; it is generally avoided in leave-on skincare and is more common in industrial or nail products.

Irritation

high

Source

synthetic

beautyskincaresolvent
Read ingredient review

Antioxidant

Methyl Aloesinyl Cinnamate

METHYL ALOESINYL CINNAMATE

3.5

A novel synthetic ingredient with potential soothing and antioxidant benefits, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Methyl Alpha-Ionone Isomers

METHYL ALPHA-IONONE ISOMERS

3.5

A synthetic floral scent ingredient that is generally safe at low levels but may cause skin reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Amyl Ketone

METHYL AMYL KETONE

3.5

Methyl amyl ketone is a synthetic fragrance ingredient that adds a fruity, banana-like scent, but it may cause skin irritation in sensitive individuals at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Anthranilate

METHYL ANTHRANILATE

3.5

Methyl anthranilate is a grape-like scent ingredient that is generally safe at low levels but may cause skin sensitivity in some people.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Emollient

Methyl Arachidic Acid

METHYL ARACHIDATE

3.8

A gentle emollient that helps soften and smooth skin with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Humectant

Methyl Aspartic Acid

METHYL ASPARTIC ACID

3.8

A gentle, synthetic amino acid derivative that may help hydrate and support the skin barrier, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Emollient

Methyl Behenate

Methyl Behenate

4.0

A gentle emollient that softens skin and improves product texture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Fragrance ingredient

Methyl Benzoate

Methyl Benzoate

3.5

Methyl benzoate is a synthetic fragrance ingredient that adds a pleasant scent to products, but it offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Methyl Benzodioxepinone

METHYL BENZODIOXEPINONE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; safe for most but may cause sensitivity in some.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Methyl Benzoylformate

Methyl Benzoylformate

3.5

Methyl Benzoylformate is a synthetic fragrance ingredient with limited research on skin benefits; it may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

UV Filter

Methyl Benzylidene Camphor

METHYL2-PHENYLMETHYLENEOCTYLIDENEAMINO BENZOATE

3.5

A synthetic UVB filter that protects skin from sunburn, but its use is restricted in some countries due to safety concerns.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

Fragrance

Methyl Beta-Naphthyl Ether

METHYL BETA-NAPHTHYL ETHER

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Methyl Butyrate

METHYL BUTYRATE

3.5

Methyl butyrate is a synthetic fragrance ingredient that adds a fruity scent to products; it is generally safe at low levels but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Methyl Canolate

METHYL CANOLATE

3.8

Methyl Canolate is a gentle, plant-based emollient that helps soften and smooth skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Skin brightening agent

Methyl Caprooyl Tyrosinate

METHYL CAPROOYL TYROSINATE

4.0

A gentle, synthetic brightener that works by slowing pigment production, making it a good option for those who find stronger brighteners irritating.

Irritation

low

Source

synthetic

beautyskincarebrightening agent
Read ingredient review

Skin brightener

Methyl Caproyl Tyrosinate

METHYL CAPRYLOYL TYROSINATE

4.0

A gentle, synthetic brightener that targets uneven skin tone and dark spots without the irritation of stronger alternatives.

Irritation

low

Source

synthetic

beautyskincarebrightening agent
Read ingredient review

Emollient

Methyl Caprylate

Methyl Caprylate

4.0

Methyl Caprylate is a gentle, non-greasy emollient that helps products glide on smoothly without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Methyl Caprylate/Caprate

Methyl Caprylate/Caprate

4.3

A lightweight, non-greasy emollient derived from coconut or palm oil that improves product texture and skin feel.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Fragrance

Methyl Cinnamate

METHYL CINNAMATE

3.5

Methyl Cinnamate is a gentle, plant-derived fragrance ingredient with some soothing potential, but it may cause sensitivity in very rare cases.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Surfactant

Methyl Coco-Glucosides

Methyl Coco-Glucosides

4.5

A gentle, coconut-derived surfactant that effectively cleanses while respecting the skin barrier.

Irritation

low

Source

natural

beautyskincarecleanser
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Emollient

Methyl Cocoate

Methyl Cocoate

4.0

A mild, plant-derived emollient that helps moisturize and soften skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Methyl Cyclohexylacetate

METHYL CYCLOHEXYLACETATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Cyclooctanecarboxylate

Methyl Cyclooctanecarboxylate

3.5

A synthetic fragrance ester with limited public data; generally considered safe at low concentrations used in cosmetics.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Cyclopentylideneacetate

METHYL CYCLOPENTYLIDENEACETATE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits and may trigger allergies in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Decenol

METHYL DECENOL

3.5

Methyl Decenol is a synthetic fragrance ingredient that adds a fresh floral note, but it offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

UV Filter

Methyl Decylideneaminobenzoate

METHYL DECYLIDENEAMINOBENZOATE

3.5

A synthetic UV filter that helps protect skin from sun damage, but is less common in modern formulations due to availability of newer alternatives.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

Skin Conditioning

Methyl Dehydroabietate

Methyl Dehydroabietate

3.5

A gentle, plant-derived ester that helps condition skin and dissolve other ingredients, but it's not a star performer on its own.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Surfactant

Methyl Dicocamine

Methyl Dicocamine

3.5

A coconut-derived surfactant that helps cleanse and condition, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

pH Adjuster

Methyl Diethanolamine

Methyl Diethanolamine

3.0

Methyl Diethanolamine is a synthetic pH adjuster that helps keep formulas stable, but it can be a mild irritant for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Emollient

Methyl Dihydroabietate

Methyl Dihydroabietate

3.5

A pine-derived ester that helps dissolve other ingredients and leaves a smooth feel, but is not a standout active for skin benefits.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Methyl Dihydrojasmonate

METHYL DIHYDROJASMONATE

4.0

A widely used synthetic fragrance that adds a pleasant jasmine-like scent to products, but offers no direct skin benefit and may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Preservative

Methyl Dihydroxybenzoate

Methyl Dihydroxybenzoate

3.5

A synthetic preservative helper that keeps products fresh and stable, but it's not a star active ingredient for your skin.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Cooling Agent

Methyl Diisopropyl Propionamide

METHYL DIISOPROPYL PROPIONAMIDE

3.8

A synthetic cooling agent that provides a refreshing sensation without the volatility of menthol, making it a gentler alternative for sensitive skin.

Irritation

low

Source

synthetic

beautyskincaresensory modifier
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Fragrance Ingredient

Methyl Dimethylbicycloheptane Carboxylate

METHYL DIMETHYLBICYCLOHEPTANE-CARBOXYLATE

3.5

A synthetic scent ingredient that adds a fresh, minty note to products but offers no skincare benefits and may be unnecessary for sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Dimethylcyclohexanecarboxylate

METHYL TRANS-1,4-DIMETHYL-CYCLOHEXANECARBOXYLATE

3.5

A synthetic cooling fragrance ingredient that adds a fresh, minty feel but offers no skincare benefits and may irritate sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Dimethyloctadienoate

METHYL DIMETHYLOCTADIENOATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Methyl Dioxaspirodecane

2-METHYL-1,5-DIOXASPIROUNDECANE

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