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 1,375
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

Film Former

Dextran Hydroxypropyltrimonium Chloride

Dextran Hydroxypropyltrimonium Chloride

4.0

A gentle conditioning polymer that smooths hair and skin without heavy buildup, making it a good choice for fine hair or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Di-C12-15 Alkyl Dimonium Chloride

DI-C12-15 ALKYL DIMONIUM CHLORIDE

3.5

A synthetic conditioning agent that reduces static and softens hair, but may cause irritation for sensitive scalps at high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Di-C12-18 Alkyl Dimonium Chloride

DI-C12-18 ALKYL DIMONIUM CHLORIDE

3.5

A synthetic conditioner that reduces static and softens hair, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Di-C14-18 Alkyl Dimonium Chloride

DI-C14-18 ALKYL DIMONIUM CHLORIDE

3.8

A synthetic conditioning agent that reduces static and softens hair, but may be too heavy for fine or oily hair and can cause irritation in sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarehaircaresurfactant
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Film Former

Di-PEG-2 Soyamine IPDI

DI-PEG-2 SOYAMINE IPDI

3.5

A synthetic polymer that helps hair feel smooth and reduces frizz, but it's not a moisturizer or repair ingredient.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair growth promoter

Diaminopyrimidine Oxide

DIAMINOPYRIMIDINE OXIDE

3.8

A synthetic molecule that helps slow hair thinning by improving the anchoring of hair fibers in the scalp.

Irritation

low

Source

synthetic

beautyhaircareactive
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Reducing Agent

Diammonium Dithiodiglycolate

DIAMMONIUM DITHIODIGLYCOLATE

3.5

An effective but strong reducing agent for permanent hair restructuring; requires careful handling to avoid scalp irritation and hair damage.

Irritation

moderate

Source

synthetic

beautyhaircarereducing agent
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Emulsifier

Dibehenyl Methylamine

Dibehenyl Methylamine

3.8

A gentle emulsifier and hair conditioner that helps create smooth, creamy textures in rinse-off and leave-on products.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Dibehenyldimonium Chloride

Dibehenyldimonium Chloride

4.0

A gentle, effective conditioning ingredient that reduces static and improves manageability without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Dicetyldimonium Chloride

Dicetyldimonium Chloride

3.8

A gentle synthetic conditioner that reduces static and softens hair without heavy buildup, but may not suit very fine or oily hair types.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Dicocodimonium Chloride

Dicocodimonium Chloride

3.5

Dicocodimonium Chloride is a synthetic conditioning agent that reduces static and softens hair, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircaresurfactant
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Antistatic Agent

Diethylaminoethyl Cocoate

DIETHYLAMINOETHYL COCOATE

3.8

A mild conditioning ingredient that helps reduce static and improve softness, but may not suit extremely sensitive scalps.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Emulsifier

Diethylaminoethyl PEG-5 Cocoate

DIETHYLAMINOETHYL PEG-5 COCOATE

3.8

A mild, coconut-derived conditioning agent that helps products spread evenly and leaves hair feeling soft without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareemulsifier
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Surfactant

Dihydrogenated Tallow Methylamine

Dihydrogenated Tallow Methylamine

3.5

An effective conditioning agent for dry or damaged hair, but may be too heavy for fine hair or oily skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Film Former

Dihydrogenated Tallow Phthalic Acid Amide

DIHYDROGENATED TALLOW PHTHALIC ACID AMIDE

3.0

A synthetic film-forming ingredient that helps products spread smoothly and hold their shape, but its safety data is limited and it may not suit sensitive or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Emulsifier

Dihydroxyethyl Soyamine Dioleate

Dihydroxyethyl Soyamine Dioleate

3.8

A gentle emulsifier and conditioner from soybean oil that helps blend oils and water while softening hair and skin, but may be too heavy for oily or acne-prone types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Dihydroxypropyltrimonium Chloride

DIHYDROXYPROPYLTRIMONIUM CHLORIDE

4.0

A gentle antistatic and conditioning ingredient that helps reduce flyaways and improve hair feel without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Dilauryldimonium Chloride

Dilauryldimonium Chloride

3.8

A synthetic conditioning ingredient that smooths hair and reduces static, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Dilinoleamidopropyl Dimethylamine

Dilinoleamidopropyl Dimethylamine

4.0

A gentle conditioning ingredient that improves softness and manageability without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioner

Dimethicone PEG-15 Acetate

DIMETHICONE PEG-15 ACETATE

3.8

A gentle silicone derivative that smooths hair and skin without heavy buildup, but may not suit those avoiding all silicones or PEG compounds.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Dimethicone PEG-7 Sulfate

Dimethicone PEG-7 Sulfate

3.8

A gentle silicone-based cleanser that helps remove dirt and oil while leaving hair and skin feeling soft, but may not suit those avoiding silicones.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Film Former

Dimethicone PEG-8 Phthalate

Dimethicone PEG-8 Phthalate

3.0

A silicone derivative that helps products spread smoothly and form a film, but its phthalate component raises some safety questions.

Irritation

low

Source

synthetic

beautyskincarehaircare
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