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.

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Reviewed ingredients

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Low-concern standouts

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Need usage caution

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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

Viscosity Controlling

Acrylic Acid

Acrylic Acid

3.0

Acrylic acid is a synthetic building block for common thickeners and stabilizers, but it is rarely used directly in skincare due to potential irritation.

Irritation

moderate

Source

synthetic

beautyskincareviscosity controlling
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Viscosity Controlling

Dibenzylidene Sorbitol

DIBENZYLIDENE SORBITOL

3.5

Dibenzylidene Sorbitol is a synthetic thickener that helps create smooth, non-greasy gels, but it has limited skin benefits and may feel heavy on some skin types.

Irritation

low

Source

synthetic

beautyskincareviscosity controlling
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Viscosity Controlling

Dimethyldibenzylidene Sorbitol

Dimethyldibenzylidene Sorbitol

3.5

A synthetic gelling agent that gives oil-based products a smooth, non-greasy texture, but is rarely used in water-based formulas.

Irritation

low

Source

synthetic

beautyskincareviscosity controlling
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Viscosity Controlling

Lithium Stearate

Lithium Stearate

3.5

Lithium Stearate is a safe, synthetic thickener that helps give cosmetics a smooth, stable texture, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincareviscosity controlling
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Viscosity Controlling

PEG-200 Trihydroxystearin

PEG-200 Trihydroxystearin

3.8

A synthetic thickener that gives creams and lotions a rich, velvety texture without clogging pores or irritating skin.

Irritation

low

Source

semi-synthetic

beautyskincareviscosity controlling
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Viscosity Controlling

Sodium Algin Sulfate

SODIUM ALGIN SULFATE

3.8

A gentle seaweed-derived thickener that helps create a smooth, spreadable texture, but research on its unique benefits is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareviscosity controlling
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