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 202
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

Solvent

1,4-Butanediol

1,4-BUTANEDIOL

3.5

A synthetic solvent that helps other ingredients dissolve and spread, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

2-Ethylbutanol

2-ETHYLBUTANOL

2.5

A synthetic alcohol used as a solvent or denaturant; can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

2-Ethylhexanol

2-ETHYLHEXANOL

2.5

A synthetic solvent used in small amounts; not a star ingredient but generally safe at low concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

2-Methyl-2-Butenol

2-METHYL-2-BUTENOL

3.0

A small alcohol molecule used mainly as a solvent or fragrance ingredient; it has limited direct skin benefit and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

2-Methylbutanol

2-METHYLBUTANOL

3.0

2-Methylbutanol is a small alcohol used to dissolve other ingredients or add scent, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

2-Octanol

2-OCTANOL

3.8

2-Octanol is a mild fatty alcohol that helps dissolve other ingredients and can boost preservative effectiveness, but it's not a primary active ingredient.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

2-Pentanol

2-PENTANOL

2.5

2-Pentanol is a solvent alcohol that can help dissolve other ingredients but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

3-Methoxybutanol

3-METHOXYBUTANOL

3.5

A synthetic solvent that helps dissolve other ingredients but may cause irritation in sensitive individuals at high concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

3-Methylpentan-1-ol

3-METHYLPENTAN-1-OL

3.0

A synthetic alcohol that helps dissolve other ingredients and adds scent, but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

3,3-Dimethyl-1-Butanol

3,3-DIMETHYL-1-BUTANOL

3.0

A synthetic alcohol used mainly as a solvent or fragrance component; generally safe at low levels but may cause irritation in sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

4-Tert-Butyltoluene

4-TERT-BUTYLTOLUENE

2.5

A synthetic solvent and fragrance ingredient with limited safety data; best avoided in leave-on products due to potential skin irritation and environmental concerns.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Acetone

Acetone

2.0

Acetone is a powerful but harsh solvent best reserved for quick, targeted removal of nail polish or stubborn adhesives, not for daily facial skincare.

Irritation

high

Source

synthetic

beautyskincaresolvent
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Plasticizer

Acetyl Tributyl Citrate

Acetyl Tributyl Citrate

3.5

A synthetic plasticizer that helps nail polish stay flexible and resist chipping, but is not a moisturizer or active skincare ingredient.

Irritation

low

Source

synthetic

beautynail caresolvent
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Solvent

Alcohol Denat.

Alcohol Denat.

3.0

Alcohol can improve product feel and penetration but is drying and irritating for many skin types, especially at high concentrations.

Irritation

high

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Amyl Alcohol

AMYL ALCOHOL

3.5

Amyl alcohol is a solvent that helps dissolve other ingredients, but it can be drying or irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Benzoyl Isopropanol

Benzoyl Isopropanol

3.0

Benzoyl Isopropanol is a synthetic solvent and fragrance ingredient with limited safety data; it may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Fragrance Ingredient

Benzyl Benzoate

Benzyl Benzoate

3.5

Benzyl benzoate is a common fragrance ingredient that can cause skin irritation in sensitive individuals, especially at higher concentrations.

Irritation

moderate

Source

semi-synthetic

beautyskincarefragrancesolvent
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Solvent

Bis-Methoxyethoxy Methane

Bis-Methoxyethoxy Methane

3.5

A synthetic solvent that helps other ingredients dissolve and improves product feel, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butoxydiglycol

Butoxydiglycol

3.5

Butoxydiglycol is a synthetic solvent that helps ingredients blend together, but it can be a mild irritant for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butoxyethanol

Butoxyethanol

2.5

Butoxyethanol is a synthetic solvent that can help dissolve other ingredients, but it carries moderate irritation and toxicity concerns, making it less common in modern skincare.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butyl Acetate

Butyl Acetate

3.5

Butyl acetate helps nail polish glide on and dry quickly, but it can be drying or irritating for sensitive skin or frequent use.

Irritation

moderate

Source

synthetic

beautynail caresolvent
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Solvent

Butyl Alcohol

N-BUTYL ALCOHOL

2.5

Butyl alcohol is a solvent rarely used in leave-on skincare; it can be drying and irritating at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butyl Benzoate

Butyl Benzoate

3.5

Butyl Benzoate is a synthetic solvent and fragrance ingredient that helps dissolve other ingredients but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butyl Ethyl Ketone

BUTYL ETHYL KETONE

2.0

Butyl ethyl ketone is a strong solvent used mainly in nail products; it can be drying and irritating, and is not a beneficial skincare ingredient.

Irritation

moderate

Source

synthetic

beautynail-caresolvent
Read ingredient review

Solvent

Butyl Glycolate

Butyl Glycolate

3.5

Butyl Glycolate is a synthetic solvent that helps dissolve other ingredients, but it has limited published safety data and may cause irritation in sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Skin Conditioning Agent

Butyl Hydroxybutyrate

Butyl Hydroxybutyrate

3.5

Butyl Hydroxybutyrate is a mild synthetic ester that helps other ingredients spread and absorb, but it has limited published research on its own benefits.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butyl Lactate

Butyl Lactate

3.8

Butyl lactate is a mild solvent that helps blend ingredients and can temporarily soften the skin, but it's not a star active ingredient.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

Butyl Propionate

Butyl Propionate

3.5

Butyl Propionate is a safe, low-irritation solvent that helps dissolve other ingredients and adds a mild scent, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butylene Carbonate

Butylene Carbonate

3.5

Butylene carbonate is a synthetic solvent that helps dissolve other ingredients and adjust product feel, but it offers no direct skin benefit and is rarely used in leave-on skincare.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

Butylene Glycol Propionate

Butylene Glycol Propionate

3.5

A gentle synthetic ester that helps other ingredients spread smoothly, but offers little direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Butyrolactone

Butyrolactone

3.0

Butyrolactone is a synthetic solvent used mainly in nail products, but it has limited skincare benefits and may cause irritation at higher levels.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C10-12 Isoparaffin

C10-12 Isoparaffin

3.5

A lightweight, non-greasy solvent that helps products spread easily and evaporate quickly, but it's a synthetic ingredient with limited skin benefits beyond texture.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C10-13 Isoparaffin

C10-13 Isoparaffin

3.8

A safe, lightweight synthetic oil that helps products glide on smoothly without clogging pores.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C11-13 Isoparaffin

C11-13 Isoparaffin

3.5

A lightweight, fast-evaporating solvent that helps products glide on smoothly, but may be drying for very dry or sensitive skin types.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C11-14 Alkane/Cycloalkane

C11-14 Alkane/Cycloalkane

4.0

A lightweight, volatile hydrocarbon that helps dissolve makeup and spread products without leaving a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C11-14 Isoparaffin

C11-14 Isoparaffin

3.5

A lightweight, volatile solvent that helps products spread smoothly and evaporates quickly, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C11-15 Alkane/Cycloalkane

C11-15 Alkane/Cycloalkane

3.8

A lightweight, volatile hydrocarbon blend that helps products glide on smoothly and evaporate quickly without leaving a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C12-14 Isoparaffin

C12-14 Isoparaffin

3.8

A gentle, fast-evaporating solvent that helps products spread smoothly without leaving a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C12-20 Isoparaffin

C12-20 Isoparaffin

3.5

A gentle, lightweight synthetic oil that helps products spread smoothly and dissolve makeup without feeling greasy.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C7-8 Isoparaffin

C7-8 Isoparaffin

3.8

A lightweight, volatile solvent that helps products spread smoothly and evaporate quickly, leaving a non-greasy finish.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C8-9 Alkane/Cycloalkane

C8-9 Alkane/Cycloalkane

4.0

A lightweight, volatile hydrocarbon that helps products spread easily and evaporate quickly without leaving a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-10 Alkane/Cycloalkane

C9-10 ALKANE/CYCLOALKANE

4.0

A lightweight, volatile hydrocarbon that helps dissolve makeup and sebum without leaving a greasy residue.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-11 Alkane/Cycloalkane

C9-11 ALKANE/CYCLOALKANE

4.0

A lightweight, non-greasy solvent that helps dissolve makeup and sunscreen while leaving a silky feel on skin.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C9-12 Isoalkanes

C9-12 ISOALKANES

4.0

A gentle, fast-evaporating hydrocarbon that helps products spread smoothly without leaving a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C9-12 Isoparaffin

C9-12 Isoparaffin

3.5

A lightweight, volatile solvent that helps products spread smoothly and evaporate quickly, leaving a non-greasy finish.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-13 Isoparaffin

C9-13 Isoparaffin

3.5

A lightweight synthetic oil that helps products spread smoothly and dissolve makeup, generally safe for most skin types.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-14 Isoparaffin

C9-14 Isoparaffin

3.5

A lightweight synthetic oil that helps products glide on smoothly without a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-16 Isoparaffin

C9-16 Isoparaffin

3.8

A safe, lightweight solvent that helps products spread easily and evaporate quickly, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

CD Alcohol 19

Alcohol Denat.

3.0

A fast-drying solvent that can help with product texture and acne, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

Cyclohexane

CYCLOHEXANE

3.5

Cyclohexane is a fast-evaporating solvent that helps dissolve oils and makeup, but it can be drying and potentially irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Cyclohexane Dimethanol

CYCLOHEXANE DIMETHANOL

3.5

A synthetic solvent that helps products spread and dry evenly, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

Cyclohexanol

CYCLOHEXANOL

2.5

Cyclohexanol is a synthetic solvent used in small amounts; it has moderate irritation potential and is not a beneficial skincare ingredient.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

Cyclohexanone

CYCLOHEXANONE

1.5

Cyclohexanone is a strong solvent with significant irritation and safety concerns; it is rarely used in leave-on skincare and is best avoided in daily products.

Irritation

high

Source

synthetic

beautyskincaresolvent
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Solvent

Cyclohexyl Toluate

Cyclohexyl Toluate

3.5

Cyclohexyl Toluate is a synthetic ester that helps dissolve other ingredients and leaves a light, non-greasy feel on skin.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

Cyclopentanone

CYCLOPENTANONE

2.5

Cyclopentanone is a synthetic solvent with limited direct skincare benefits; it may cause irritation in sensitive individuals and is best avoided in leave-on products.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

Denatured Alcohol

Alcohol Denat.

3.0

Denatured alcohol evaporates quickly to give a matte finish but can strip the skin's moisture barrier, making it best for oily or acne-prone skin and risky for dry or sensitive types.

Irritation

high

Source

synthetic

beautyskincaresolvent
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Solvent

Diacetone Alcohol

Diacetone Alcohol

3.5

Diacetone alcohol is a synthetic solvent that helps dissolve other ingredients, but it can be drying and may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

Dibenzyl

DIBENZYL

3.0

Dibenzyl is a synthetic solvent and fragrance ingredient with moderate irritation potential; it is not a primary active but may appear in small amounts in scented products.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

Dibutoxymethane

Dibutoxymethane

3.5

Dibutoxymethane is a synthetic solvent that helps products spread and dry quickly, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

Dibutyl Oxalate

Dibutyl Oxalate

3.0

Dibutyl Oxalate is a synthetic solvent found mainly in nail products; it helps ingredients blend and dry, but there is limited safety data for leave-on skincare.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review