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

Surfactant

C12-15 Pareth-9 Phosphate

C12-15 PARETH-9 PHOSPHATE

3.5

A mild synthetic surfactant that helps cleanse without stripping, but may cause irritation for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

C12-16 Pareth-5

C12-16 PARETH-5

3.8

A gentle, synthetic cleansing ingredient that helps lift dirt and oil without stripping the skin, but may not suit extremely sensitive or compromised skin barriers.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

C12-16 Pareth-6 Phosphate

C12-16 PARETH-6 PHOSPHATE

3.8

A mild cleansing agent that helps remove dirt and oil without stripping the skin, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

C12-16 Pareth-7

C12-16 Pareth-7

4.0

A gentle, effective cleansing ingredient that helps lift dirt and oil without stripping the skin, making it a solid choice for daily cleansers.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

C12-16 Pareth-9

C12-16 PARETH-9

4.0

A gentle cleansing ingredient that helps remove dirt and oil without stripping the skin, but may cause mild irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarecleansing agent
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Emollient

C12-17 Alkane

C12-17 Alkane

4.5

A gentle, plant-derived emollient that hydrates without heaviness, ideal for sensitive and oily skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C12-18 Acid Triglyceride

C12-18 Acid Triglyceride

4.2

A gentle, plant-derived emollient that softens skin without clogging pores, ideal for dry or sensitive skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Surfactant

C12-18 Alkyl Glucoside

C12-18 Alkyl Glucoside

4.5

A mild, plant-based surfactant that cleanses without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarecleanser
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Emulsifier

C12-20 Acid PEG-8 Ester

C12-20 ACID PEG-8 ESTER

4.0

A gentle emulsifier that helps mix water and oil, making creams and lotions smooth and stable.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

C12-20 Alkyl Glucoside

C12-20 Alkyl Glucoside

4.5

A gentle, plant-based surfactant that effectively cleanses without disrupting the skin barrier, making it ideal for sensitive and dry skin types.

Irritation

low

Source

natural

beautyskincarecleansing
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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
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Film Former

C12-22 Alkyl Acrylate Copolymer

C12-22 ALKYL ACRYLATE/HYDROXYETHYLACRYLATE COPOLYMER

4.0

A gentle synthetic polymer that forms a flexible film on skin or hair, improving product feel and longevity without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Emollient

C13-14 Isoparaffin

C13-14 Isoparaffin

3.8

A safe, lightweight emollient that helps products spread smoothly and leaves a non-greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C13-15 Alkane

C13-15 Alkane

4.5

A silky, plant-derived emollient that feels lightweight and non-greasy, making it a great alternative to silicones.

Irritation

low

Source

natural

beautyskincareemollient
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Surfactant

C13-15 Pareth-21

C13-15 PARETH-21

4.0

A gentle synthetic emulsifier that helps mix oil and water, commonly used in cleansers and lotions with a low irritation risk.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emollient

C13-16 Isoparaffin

C13-16 Isoparaffin

3.5

A safe, lightweight synthetic oil that helps products spread smoothly and feel non-greasy, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C13-C15 Alkane

C13-15 Alkane

4.0

A gentle, plant-derived emollient that spreads easily and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C14-15 Dialkyl Carbonate

C14-15 DIALKYL CARBONATE

4.3

A silky, non-greasy emollient that improves product feel and spreadability, with a low risk of irritation or clogged pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

C14-15 Pareth-11

C14-15 PARETH-11

3.8

A gentle synthetic emulsifier that helps mix water and oil in your skincare products without causing irritation.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

C14-15 Pareth-12

C14-15 PARETH-12

4.0

A gentle synthetic surfactant that helps cleansers foam and rinse cleanly, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

C14-15 Pareth-13

C14-15 PARETH-13

3.8

A mild synthetic emulsifier that helps mix oil and water in cleansers and lotions, generally well-tolerated.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

C14-15 Pareth-4

C14-15 PARETH-4

3.8

A gentle synthetic emulsifier that helps cleansers foam and lotions stay mixed, with a low irritation profile for most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

C14-15 Pareth-7

C14-15 PARETH-7

3.8

A gentle synthetic surfactant that helps cleanse without stripping the skin, but may not suit extremely sensitive skin in high concentrations.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

C14-15 Pareth-8

C14-15 PARETH-8

4.0

A mild synthetic emulsifier that helps cleansers foam and rinse cleanly without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emollient

C14-16 Glycol Palmitate

C14-16 Glycol Palmitate

3.8

A gentle synthetic emollient that makes products feel smooth and creamy without heavy greasiness.

Irritation

low

Source

synthetic

beautyskincareemollient
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Solvent

C14-16 Isoparaffin

C14-16 Isoparaffin

3.8

A safe, lightweight synthetic oil that helps products spread smoothly and feel non-greasy, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C14-18 Acid Glycol Ester

C14-18 Acid Glycol Ester

4.0

A gentle synthetic emollient that helps products feel smooth and spread easily, with a low risk of irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C14-18 Alkyl Ethylhexanoate

C14-18 Alkyl Ethylhexanoate

4.0

A lightweight, synthetic emollient that softens skin without clogging pores, commonly used to improve product texture and spreadability.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C14-18 Glycol

C14-18 Glycol

3.8

A gentle thickening and emollient ingredient that helps create a smooth, creamy texture in skincare products.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C14-19 Alkane

C14-19 Alkane

4.0

A gentle, plant-derived emollient that provides a silky feel and helps other ingredients absorb without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C14-20 Alkane

C14-20 Alkane

4.3

A gentle, non-greasy emollient derived from plant sources that helps soften skin and improve product texture.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C14-22 Alcohols

C14-22 Alcohols

4.0

A safe, non-drying fatty alcohol blend that helps create a smooth, creamy texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C14-22 Alkane

C14-22 Alkane

4.5

A gentle, plant-derived emollient that provides a silky, non-greasy feel without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Cleansing Agent

C14-28 Alkyl Acid

C14-28 Alkyl Acid

3.8

A gentle fatty acid blend that helps cleanse without stripping the skin.

Irritation

low

Source

natural

beautyskincarecleansing agent
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Emollient

C14-28 Isoalkyl Acid

C14-28 Isoalkyl Acid

3.8

A gentle synthetic fatty acid that helps soften skin and stabilize formulas without common irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C14-30 Alkyl Beeswax

C14-30 Alkyl Beeswax

4.0

A gentle, synthetic wax that helps thicken and stabilize formulas, giving a smooth, non-greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C15-18 Glycol

C15-18 Glycol

4.0

C15-18 Glycol is a gentle emollient that helps soften skin and improve product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C15-19 Alkane

C15-19 Alkane

4.3

A gentle, plant-derived emollient that provides a silky feel without clogging pores or causing irritation.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C15-19 Isoparaffin

C15-19 Isoparaffin

3.8

A safe, lightweight synthetic oil that helps products spread smoothly and leaves a non-greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C15-23 Alkane

C15-23 Alkane

4.5

A gentle, plant-derived emollient that provides a silky feel without clogging pores or causing irritation.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C15-35 Isoparaffin Blend

C15-35 ISOPARAFFIN/ISOALKYLCYCLOALKANES

3.5

A synthetic emollient that helps products spread smoothly and feel silky, but offers no active skin benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C16-17 Alcohols

C16-17 ISOALCOHOLS

4.0

A gentle, non-greasy emollient that helps soften skin and improve product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C16-17 Alkyl Benzoate

C16-17 Alkyl Benzoate

4.2

A lightweight, silky emollient that helps products spread smoothly without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Surfactant

C16-22 Acid Amide MEA

C16-22 Acid Amide MEA

3.8

A mild synthetic ingredient that helps create a rich, stable lather and a creamy feel in cleansers, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarecleansing
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Emollient

C16-23 Alkane

C16-23 Alkane

4.0

A gentle, plant-derived emollient that provides a silky feel without clogging pores or causing irritation.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C16-36 Alkyl Stearate

C16-36 ALKYL STEARATE

4.0

A gentle, non-greasy emollient that improves product texture and skin feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C18-20 Hydroxyalkyl Acid Blend

TETRADECYL/HEXADECYL C18-20 HYDROXYALKYL ACID

3.5

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

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

C18-21 Alkane

C18-21 Alkane

4.2

A gentle, plant-derived emollient that hydrates and softens skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

C18-24 Isoparaffin

C18-24 Isoparaffin

3.8

A synthetic, lightweight oil that helps products glide on smoothly without feeling heavy, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
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