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

Conditioning Agent

Amodimethicone Hydroxystearate

Amodimethicone Hydroxystearate

4.0

A gentle, modified silicone that smooths hair and skin without the heavy feel or buildup of standard silicones.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Conditioning agent

Amp-Isostearoyl Hydrolyzed Wheat Protein

AMP-ISOSTEAROYL HYDROLYZED WHEAT PROTEIN

4.0

A gentle, protein-based conditioning ingredient that adds softness and manageability to hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Film Former

AMPD-Acrylates Copolymer

AMPD-ACRYLATES/DIACETONEACRYLAMIDE COPOLYMER

3.5

A synthetic film-former that helps products stay put, but it can feel tight or dry on some skin types.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Surfactant

Apricotamidopropyl Betaine

APRICOTAMIDOPROPYL BETAINE

4.0

A gentle, coconut-derived surfactant that cleans without stripping the skin, ideal for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Avocadamidopropalkonium Chloride

Avocadamidopropalkonium Chloride

4.0

A gentle conditioning ingredient from avocado oil that helps soften hair and skin while offering mild antimicrobial benefits.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioning Agent

Avocadamidopropyl Dimethylamine

AVOCADAMIDOPROPYL DIMETHYLAMINE

4.0

A mild, avocado-derived conditioning ingredient that softens hair and reduces static without weighing it down.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Surfactant

Babassuamidopropalkonium Chloride

Babassuamidopropalkonium Chloride

3.8

A gentle, plant-derived conditioning agent that helps soften hair and skin while providing mild antimicrobial benefits.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Behenalkonium Chloride

Behenalkonium Chloride

3.5

Behenalkonium chloride is a gentle conditioning agent that helps reduce static and soften hair, but it can be irritating to sensitive skin or eyes in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Viscosity Controlling

Behenamide

Behenamide

3.8

Behenamide is a safe, synthetic thickener that helps create a smooth, creamy texture in skincare and haircare products.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Behenamidoethyl Diethylamine

BEHENAMIDOETHYL DIETHYLAMINE

3.8

A gentle conditioning agent that helps soften hair and skin without heavy buildup, but may not suit very sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Surfactant

Behenamidopropyl Betaine

Behenamidopropyl Betaine

4.0

A gentle, coconut-derived surfactant that helps create rich foam and a silky feel in cleansers and conditioners, with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Conditioning Agent

Behenamidopropyl Dimethylamine

BEHENAMIDOPROPYL DIMETHYLAMINE

4.0

A gentle, effective conditioning ingredient that softens hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioning Agent

Behenamidopropyl Dimethylamine Lactate

BEHENAMIDOPROPYL DIMETHYLAMINE LACTATE

4.0

A gentle, effective hair conditioner that mimics natural lipids, offering slip and softness without the weight of silicones.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Behenamidopropyltrimonium Methosulfate

BEHENAMIDOPROPYLTRIMONIUM METHOSULFATE

4.5

A mild, effective hair conditioner that detangles and softens without the heavy buildup of traditional silicones or quats.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Behentrimonium Chloride

Behentrimonium Chloride

4.2

A gentle, effective conditioning ingredient that detangles hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Behentrimonium Methosulfate

Behentrimonium Methosulfate

4.5

A gentle, plant-derived conditioning ingredient that softens hair and skin without the heavy buildup or irritation of older quaternary ammonium compounds.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Surfactant

Behenyl Betaine

Behenyl Betaine

4.3

A mild, conditioning surfactant that cleans without stripping, making it ideal for sensitive skin and dry hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Emollient

Behenyl Dimethicone

BEHENYL DIMETHICONE

4.3

A gentle silicone that improves product feel and spreadability, suitable for most skin types including sensitive skin.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Benzyltrimonium Hydrolyzed Collagen

Benzyltrimonium Hydrolyzed Collagen

3.8

A positively charged collagen derivative that clings to hair and skin to provide conditioning, smoothness, and a protective film.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Conditioning agent

Biotinoyl Hexapeptide-2 Amide

Biotinoyl Hexapeptide-2 Amide

4.0

A synthetic peptide that may help reduce hair thinning and improve skin firmness by supporting collagen and keratin production.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair conditioning agent

Biotinoyl Pentapeptide-4

BIOTINOYL TRIPEPTIDE-1

4.0

A synthetic peptide that may help support hair thickness and scalp vitality, but results vary and more human studies are needed.

Irritation

low

Source

synthetic

beautyhaircarepeptide
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Hair conditioning agent

Biotinoyl Tetrapeptide-51

BIOTINOYL TETRAPEPTIDE-51

4.0

A lab-made peptide that may help strengthen hair and improve skin firmness, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning agent

Biotinoyl Tripeptide Complex

BIOTINOYL HISTIDYL D-TRYPTOPHANYL DIPEPTIDE-29 D-PHENYLALANYL LYSINAMIDE TRIFLUOROACETATE

3.8

A synthetic peptide that may help strengthen hair and support skin firmness, but research is still early.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Biotinoyl Tripeptide-35

BIOTINOYL TRIPEPTIDE-35

3.8

A lab-made peptide that may help strengthen hair and support skin firmness, but human studies are limited.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair Conditioner

Bis-Aminopropyl Dimethicone

BIS-AMINOPROPYL DIMETHICONE

4.0

A gentle silicone that adds slip and shine to hair and a silky feel to skin, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair conditioner

Bis-Cetearyl Amodimethicone

BIS-CETEARYL AMODIMETHICONE

4.0

A gentle silicone that smooths hair and reduces static, but may not suit very fine or low-porosity hair if used excessively.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Bis-Dimonium Methosulfate

Bis-Dimonium Methosulfate

3.5

A synthetic antistatic ingredient that helps reduce frizz and improve hair feel, but may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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