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 25 of 25
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

Antiperspirant

Aluminum Bromohydrate

ALUMINUM BROMOHYDRATE

3.5

Aluminum bromohydrate is a common antiperspirant active that effectively reduces sweat but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareantiperspirant
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Antiperspirant Agent

Aluminum Chlorohydrate

Aluminum Chlorohydrate

4.0

Aluminum chlorohydrate is an effective antiperspirant that blocks sweat glands temporarily, but it may cause irritation for sensitive skin and has been the subject of ongoing safety debates.

Irritation

moderate

Source

synthetic

beautyskincareantiperspirant
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Antiperspirant Agent

Aluminum Chlorohydrex PEG

Aluminum Chlorohydrex PEG

3.5

A common antiperspirant active that effectively reduces sweat but may cause irritation for sensitive skin and has ongoing safety discussions.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant Agent

Aluminum Chlorohydrex PG

Aluminum Chlorohydrex PG

3.8

A common antiperspirant ingredient that effectively reduces sweat but may cause irritation for some and has been the subject of safety debates.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant Agent

Aluminum Dichlorohydrate

Aluminum Dichlorohydrate

3.8

Effective at reducing underarm sweat, but may cause irritation for sensitive skin and has been the subject of long-standing safety debates.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant Agent

Aluminum Dichlorohydrex PEG

Aluminum Dichlorohydrex PEG

3.5

A common antiperspirant active that effectively reduces sweat but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
Read ingredient review

Antiperspirant agent

Aluminum Dichlorohydrex PG

ALUMINUM DICHLOROHYDREX PG

3.8

A common antiperspirant active that effectively reduces sweat but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
Read ingredient review

Astringent

Aluminum Methionate

Aluminum Methionate

3.5

Aluminum Methionate works as an astringent and antiperspirant, but its safety is debated and it may irritate sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareantiperspirant
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Antiperspirant

Aluminum PCA

Aluminum PCA

3.5

Aluminum PCA effectively reduces sweat and tightens skin, but its aluminum content raises concerns for sensitive or irritated skin.

Irritation

moderate

Source

synthetic

beautyskincareantiperspirant
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Astringent

Aluminum Phenolsulfonate

Aluminum Phenolsulfonate

3.5

Aluminum Phenolsulfonate works as an astringent and antimicrobial to reduce sweat and odor, but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareantiperspirant
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Antiperspirant agent

Aluminum Salts

Aluminum Chlorohydrate

3.5

Aluminum salts are effective antiperspirants but have been the subject of safety debates; current evidence supports their safety in cosmetics at regulated levels.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant agent

Aluminum Sesquichlorohydrate

Aluminum Sesquichlorohydrate

3.8

A common antiperspirant ingredient that effectively reduces underarm wetness but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
Read ingredient review

Antiperspirant Agent

Aluminum Sesquichlorohydrex PEG

Aluminum Sesquichlorohydrex PEG

3.5

Aluminum Sesquichlorohydrex PEG is a common antiperspirant active that effectively reduces sweat but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
Read ingredient review

Antiperspirant Agent

Aluminum Sesquichlorohydrex PG

Aluminum Sesquichlorohydrex PG

3.8

A common antiperspirant ingredient that effectively reduces sweat but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareantiperspirant
Read ingredient review

Antiperspirant Agent

Aluminum Zirconium Octachlorohydrate

Aluminum Zirconium Octachlorohydrate

3.5

Effective at reducing sweat, but may cause irritation for sensitive skin and has been linked to safety debates.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant Agent

Aluminum Zirconium Pentachlorohydrate

Aluminum Zirconium Pentachlorohydrate

3.8

A widely used antiperspirant ingredient that effectively reduces sweat but may cause irritation for some, especially after shaving.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant Agent

Aluminum Zirconium Pentachlorohydrex Gly

Aluminum Zirconium Pentachlorohydrex Gly

3.8

A widely used antiperspirant active that effectively reduces underarm wetness but may cause irritation for sensitive skin and has raised long-term safety questions.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant Agent

Aluminum Zirconium Tetrachlorohydrate

Aluminum Zirconium Tetrachlorohydrate

3.5

A widely used antiperspirant active that works by temporarily blocking sweat ducts, but may cause irritation for some and has been the subject of long-standing safety debates.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
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Antiperspirant Agent

Aluminum Zirconium Tetrachlorohydrex Gly

Aluminum Zirconium Tetrachlorohydrex Gly

3.5

A common antiperspirant active that effectively reduces sweat but may cause irritation for sensitive skin and has been linked to safety debates.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
Read ingredient review

Antiperspirant Agent

Aluminum Zirconium Tetrachlorohydrex PG

ALUMINUM ZIRCONIUM TETRACHLOROHYDREX PG

3.5

Effective at reducing underarm sweat, but may cause irritation for sensitive skin and has been the subject of safety debates.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
Read ingredient review

Antiperspirant Agent

Aluminum Zirconium Trichlorohydrate

Aluminum Zirconium Trichlorohydrate

3.8

An FDA-approved antiperspirant active that effectively reduces underarm sweat but may cause skin irritation in some people.

Irritation

moderate

Source

synthetic

beautypersonal careantiperspirant
Read ingredient review

Antiperspirant Agent

Aluminum Zirconium Trichlorohydrex Gly

ALUMINUM ZIRCONIUM TRICHLOROHYDREX GLY

3.5

Effective at reducing sweat, but may cause irritation for sensitive skin and has been the subject of long-standing safety debates.

Irritation

moderate

Source

synthetic

beautyskincareantiperspirant
Read ingredient review