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 115
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

Thickener

Acacia Farnesiana Gum

Acacia Farnesiana Gum

3.8

A gentle natural gum that helps thicken formulas and leaves a light, non-sticky film on skin.

Irritation

low

Source

natural

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Thickener

Acrylamide

Acrylamide

2.5

Acrylamide is not a direct cosmetic ingredient but a potential impurity in certain polymers; regulatory limits exist to keep levels safe in finished products.

Irritation

moderate

Source

synthetic

beautyskincarethickener
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Thickener

Acrylamide/Sodium Acrylate Copolymer

ACRYLAMIDE/SODIUM ACRYLATE COPOLYMER

3.8

A safe, effective thickener that gives products a smooth, lightweight feel, but its synthetic origin and potential for trace acrylamide residue raise minor concerns.

Irritation

low

Source

synthetic

beautyskincarethickener
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Film Former

Acrylic Acid/VP Crosspolymer

ACRYLIC ACID/VP CROSSPOLYMER

3.8

A synthetic thickener and film former that helps create a smooth, lightweight feel in gels and serums, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarethickener
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Thickener

Agar

Agar

4.2

A gentle, seaweed-derived thickener that helps create smooth gel textures without irritating skin.

Irritation

low

Source

natural

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Thickener

Agarose

Agarose

4.0

A gentle, seaweed-derived thickener that gives gels a smooth texture without clogging pores or irritating skin.

Irritation

low

Source

natural

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Thickener

Algin

Algin

4.2

A gentle seaweed-derived thickener that helps create smooth, spreadable textures and may offer light hydration.

Irritation

low

Source

natural

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Thickener

Alginic Acid

Alginic Acid

4.0

A seaweed-derived thickener and gentle film-former that helps create smooth, spreadable textures without clogging pores.

Irritation

low

Source

natural

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Viscosity controlling agent

Aluminum Isostearates/Palmitates

ALUMINUM ISOSTEARATES/PALMITATES

3.5

A synthetic thickener and stabilizer that helps keep makeup and creams smooth, but may be moderately pore-clogging for some.

Irritation

low

Source

synthetic

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Thickener

Aluminum Stearoyl Glutamate

ALUMINUM STEAROYL GLUTAMATE

4.0

A safe, effective thickener and emulsifier that improves product texture without common irritation concerns.

Irritation

low

Source

semi-synthetic

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Thickener

Ammonium Alginate

Ammonium Alginate

4.0

A gentle, seaweed-based thickener that helps create smooth, stable formulas without clogging pores or irritating skin.

Irritation

low

Source

natural

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Emollient

Behenyl Alcohol

BEHENYL ALCOHOL

4.5

Behenyl alcohol is a gentle, plant-derived fatty alcohol that thickens and stabilizes formulas without clogging pores or irritating skin.

Irritation

low

Source

natural

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Emollient

C20-22 Alcohols

C20-22 Alcohols

4.0

A safe, non-drying fatty alcohol that gives creams a silky feel and helps stabilize formulas without clogging pores.

Irritation

low

Source

natural

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Emollient

C20-40 Alcohols

C20-40 Alcohols

4.0

A safe, non-drying fatty alcohol that helps thicken and stabilize creams and lotions without clogging pores.

Irritation

low

Source

synthetic

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Thickener

Calcium Alginate

CALCIUM ALGINATE

4.0

A gentle, seaweed-derived thickener that can help soothe and calm the skin while improving product texture.

Irritation

low

Source

natural

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Thickener

Carnauba Wax

Copernicia Cerifera Wax

4.0

Carnauba wax is a natural, plant-based thickener and shiner commonly found in lip products and creams, with a very low risk of irritation or clogged pores.

Irritation

low

Source

natural

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Thickener

Carrageenan

Chondrus Crispus (Carrageenan) Extract

4.0

Carrageenan is a natural seaweed extract that helps thicken and soothe skincare products, but its film-forming effect may not suit everyone.

Irritation

low

Source

natural

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Thickener

Cassia Gum

Cassia Gum

4.0

A gentle, plant-based thickener that helps create a smooth, spreadable texture in skincare products without clogging pores.

Irritation

low

Source

natural

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Thickener

Cellulose

Cellulose

4.0

Cellulose is a gentle, plant-derived ingredient that thickens formulas and can provide mild physical exfoliation without irritation.

Irritation

low

Source

natural

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Thickener

Ceresin

Ceresin

4.0

Ceresin is a safe, non-irritating wax that gives products a smooth texture and helps lock in moisture.

Irritation

low

Source

synthetic

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Emollient

Cetyl Alcohol

Cetyl Alcohol

4.5

Cetyl alcohol is a safe, non-drying fatty alcohol that helps thicken and stabilize products while leaving skin soft and smooth.

Irritation

low

Source

natural

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Thickener

Cetyl Hydroxyethylcellulose

Cetyl Hydroxyethylcellulose

4.0

A gentle, non-irritating thickener that improves product texture and stability without clogging pores.

Irritation

low

Source

semi-synthetic

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Thickener

Dehydroxanthan Gum

Dehydroxanthan Gum

4.0

A gentle, effective thickener that improves product texture without clogging pores or irritating skin.

Irritation

low

Source

biotech

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Thickener

Gellan Gum

Gellan Gum

4.5

A gentle, plant-derived thickener that gives skincare products a smooth, lightweight gel texture without clogging pores or irritating skin.

Irritation

low

Source

natural

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Thickener

Ghatti Gum

ANOGENUS LATIFOLIA GUM

3.8

Ghatti gum is a natural thickener that improves product texture and stability, but it's not a star active ingredient for skin benefits.

Irritation

low

Source

natural

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Viscosity Controlling

Guar Gum

Cyamopsis Tetragonoloba Gum

4.0

A gentle, plant-derived thickener that improves product feel and stability without clogging pores.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Xanthan Gum

Hydrolyzed Xanthomonas Campestris Polysaccharides

4.0

A gentle, hydrating ingredient that helps skin hold onto moisture without feeling heavy or sticky.

Irritation

low

Source

biotech

beautyskincarehumectantthickener
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Viscosity Controlling

Hydroxyethyl Ethylcellulose

Hydroxyethyl Ethylcellulose

4.0

A gentle, plant-derived thickener that improves product texture without clogging pores or irritating skin.

Irritation

low

Source

semi-synthetic

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Thickener

Hydroxypropyl Oxidized Starch

Hydroxypropyl Oxidized Starch

4.0

A gentle, plant-derived thickener that improves texture and stability without clogging pores or irritating skin.

Irritation

low

Source

semi-synthetic

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Thickener

Irish Moss Powder

Chondrus Crispus Powder

4.0

A gentle seaweed powder that helps thicken and soothe formulas, but its benefits are mostly textural rather than active.

Irritation

low

Source

natural

beautyskincarethickener
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Film Former

Methacrylic Acid Copolymer

METHACRYLIC ACID/SODIUM ACRYLAMIDOMETHYL PROPANE SULFONATE COPOLYMER

4.0

A synthetic polymer that helps create a smooth, spreadable texture and can leave a light, flexible film on skin or hair.

Irritation

low

Source

synthetic

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Thickener

Methyl Ethylcellulose

METHYL ETHYLCELLULOSE

4.0

A gentle, plant-derived thickener that improves product texture and stability without clogging pores or irritating skin.

Irritation

low

Source

semi-synthetic

beautyskincarethickener
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Viscosity Controlling

Methyl Hydroxyethylcellulose

METHYL HYDROXYETHYLCELLULOSE

4.2

A gentle, plant-derived thickener that improves product texture without clogging pores or irritating skin.

Irritation

low

Source

semi-synthetic

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Thickener

Methylamido Cellulose Gum

Methylamido Cellulose Gum

3.8

A gentle, plant-derived thickener that improves product texture without common irritation concerns.

Irritation

low

Source

semi-synthetic

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Thickener

Microcrystalline Wax

MICROCRYSTALLINE WAX

3.8

A petroleum-derived wax that gives lipsticks and creams a smooth, stable texture, but may not suit those avoiding petrochemicals.

Irritation

low

Source

synthetic

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Emollient

Mustela Cera

Cera Alba (Beeswax), Cera Flava (Yellow Beeswax), Cera Microcristallina, Cera Carnauba (Copernicia Cerifera Cera), Cera Candelilla (Euphorbia Cerifera Cera)

4.0

A wax blend that helps lock in moisture and give products a rich, protective feel, but may clog pores for some skin types.

Irritation

low

Source

mixed

beautyskincareemollientthickener
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Thickener

Natto Gum

Natto Gum

3.8

Natto Gum is a gentle, natural thickener from fermented soy that can add a silky feel and light hydration to products, but research on its skin benefits is still limited.

Irritation

low

Source

natural

beautyskincarethickener
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Viscosity Controlling

Nonoxynyl Hydroxyethylcellulose

Nonoxynyl Hydroxyethylcellulose

3.8

A gentle thickening agent that improves product texture and stability, generally safe for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincarethickener
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