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

Hair Conditioning Agent

Silicone Quaternium-22

Silicone Quaternium-22

4.0

A gentle silicone conditioner that smooths hair without heavy buildup, ideal for fine or oily hair types.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-24

Silicone Quaternium-24

4.0

A gentle silicone conditioner that reduces frizz and flyaways without heavy buildup, suitable for most hair types.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair Conditioner

Silicone Quaternium-25

Silicone Quaternium-25

4.0

A gentle conditioning silicone that smooths hair and skin without heavy buildup, but may not suit those avoiding silicones entirely.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Silicone Quaternium-26

Silicone Quaternium-26

3.8

A gentle silicone conditioner that smooths hair without heavy buildup, but may not suit very fine or low-porosity hair.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-27

Silicone Quaternium-27

4.0

A gentle, water-soluble silicone that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-3

Silicone Quaternium-3

3.8

Silicone Quaternium-3 is a gentle conditioning ingredient that helps detangle and soften hair without heavy buildup, but may not suit very fine or low-porosity hair if used excessively.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Silicone Quaternium-4

Silicone Quaternium-4

4.0

A gentle silicone that smooths hair and fights frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-5

Silicone Quaternium-5

4.0

A gentle silicone conditioner that smooths hair and skin without heavy buildup, ideal for fine or oily hair types.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Conditioning agent

Silicone Quaternium-6

Silicone Quaternium-6

3.8

A gentle silicone derivative that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Silicone Quaternium-7

Silicone Quaternium-7

4.0

Silicone Quaternium-7 is a gentle conditioning silicone that smooths hair and skin without heavy buildup, making it a popular choice for detangling and frizz control.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioner

Silicone Quaternium-8

Silicone Quaternium-8

3.8

A gentle conditioning silicone that smooths hair and fights frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Silicone Quaternium-9

Silicone Quaternium-9

4.0

Silicone Quaternium-9 is a gentle, water-soluble conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Film Former

Silicone-Polymer Film Former

IPDI/DI-C12-13 ALKYL TARTRATE/BIS-HYDROXYETHOXYPROPYL DIMETHICONE COPOLYMER

3.8

A synthetic film former that helps makeup and sunscreen stay put longer without feeling overly stiff or sticky.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm former
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Film Former

Silylated Arginine Crosspolymer

TRIMETHYLSILYL ARGININE PG-PROPYL METHYLSILANEDIOL CROSSPOLYMER

3.8

A silicone-arginine hybrid that provides smoothness and conditioning without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarefilm former
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Film Former

Silylated Casein Complex

DIHYDROXYMETHYLSILYLPROPOXY HYDROXYPROPYL HYDROLYZED CASEIN

3.8

A gentle, film-forming ingredient that smooths hair and skin by depositing a lightweight, protective layer.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarefilm-former
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Film Former

Silylated Collagen Crosspolymer

Trimethylsilyl Hydrolyzed Collagen PG-Propyl Methylsilanediol Crosspolymer

3.8

A silicone-collagen hybrid that forms a smooth, flexible film for temporary smoothing and conditioning, but offers no lasting collagen benefit.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Silylated Conchiolin Protein Complex

TRIMETHYLSILYL HYDROLYZED CONCHIOLIN PROTEIN PG-PROPYL METHYLSILANEDIOL CROSSPOLYMER

3.8

A silicone-modified pearl protein that forms a flexible, breathable film for smoother hair and a temporary skin-smoothing effect.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarefilm former
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Film Former

Silylated Pea Protein Complex

Trimethylsilyl Hydrolyzed Pea Protein PG-Propyl Methylsilanediol Crosspolymer

3.8

A gentle film-forming ingredient that adds smoothness and shine to hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Silylated Silk Crosspolymer

Trimethylsilyl Hydrolyzed Silk PG-Propyl Methylsilanediol Crosspolymer

4.0

A gentle, silicone-like film former derived from silk that smooths skin and hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Silylated Wheat Protein Complex

TRIMETHYLSILYL HYDROLYZED WHEAT PROTEIN PG-PROPYL METHYLSILANEDIOL CROSSPOLYMER

4.0

A gentle film-forming ingredient that smooths hair and skin without heavy buildup, but may not suit those avoiding silicones or wheat-derived ingredients.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Sodium Carboxymethyl Chitosan Lauramide

SODIUM CARBOXYMETHYL CHITOSAN LAURAMIDE

4.0

A gentle, multi-tasking chitosan derivative that hydrates, forms a protective film, and offers mild cleansing without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Sodium Coco PG-Dimonium Chloride Phosphate

SODIUM COCO PG-DIMONIUM CHLORIDE PHOSPHATE

4.0

A gentle coconut-derived surfactant and conditioner that cleans without stripping, making it a good choice for sensitive or dry hair and skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Cocoyl Hydrolyzed Collagen

SODIUM COCOYL HYDROLYZED COLLAGEN

4.0

A gentle, coconut-derived cleanser that also conditions skin and hair, making it a good choice for sensitive or dry types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Cocoyl Hydrolyzed Rice Protein

SODIUM COCOYL HYDROLYZED RICE PROTEIN

4.5

A mild, plant-based cleanser that removes dirt without stripping the skin, making it ideal for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarecleanser
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Surfactant

Sodium Cornamphopropionate

SODIUM CORNAMPHOPROPIONATE

4.0

A gentle, coconut-derived surfactant that effectively cleanses while being kinder to sensitive skin than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarecleanser
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Surfactant

Sodium Hempseedamphoacetate

SODIUM HEMPSEEDAMPHOACETATE

4.3

A gentle, hemp-derived surfactant that cleanses without stripping the skin — ideal for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarehaircare
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Surfactant

Sodium Lauraminopropionate

Sodium Lauraminopropionate

4.0

A gentle, amino acid-based surfactant that cleanses effectively without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Sodium Laureth-8 Carboxylate

SODIUM LAURETH-8 CARBOXYLATE

3.8

A gentle, ethoxylated surfactant that cleans effectively without stripping the skin, but its ethoxylation process raises minor environmental and purity concerns.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Oleoyl Hydrolyzed Collagen

Sodium Oleoyl Hydrolyzed Collagen

4.0

A mild, collagen-derived surfactant that cleanses gently and leaves skin and hair feeling soft, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Sodium Palmitoyl Hydrolyzed Wheat Protein

SODIUM PALMITOYL HYDROLYZED WHEAT PROTEIN

4.0

A mild, protein-based surfactant that cleanses gently and leaves hair and skin feeling soft, making it a good choice for sensitive or dry types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Stearoyl Hydrolyzed Wheat Protein

Sodium Stearoyl Hydrolyzed Wheat Protein

4.0

A mild, protein-based surfactant that cleanses gently and leaves hair and skin feeling soft, making it a good choice for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Stearoyl Soy Protein

Sodium Stearoyl Soy Protein

4.0

A mild, plant-derived surfactant that cleanses gently while leaving skin and hair feeling soft, making it a good choice for sensitive or dry types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Sodium Tauride Acrylates Copolymer

SODIUM TAURIDE ACRYLATES/ACRYLIC ACID/ACRYLONITROGENS COPOLYMER

4.0

A gentle film-forming polymer that helps products spread smoothly and leaves a comfortable, non-sticky finish.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair Conditioning Agent

Sorbityl Dimonium Anisate

Sorbityl Dimonium Anisate

4.0

A mild, plant-based conditioning ingredient that softens hair and helps control odor-causing microbes without harshness.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Soy & Rapeseed Oil Conditioning Agent

Bis-Soyoyl/Rapeseedoyl Ethyl Hydroxyethylmonium Methosulfate

4.0

A gentle, plant-based conditioning ingredient that helps detangle and soften hair with minimal irritation risk.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Soy Hydroxyethyl Imidazoline

SOY HYDROXYETHYL IMIDAZOLINE

3.8

A gentle, plant-derived conditioning agent that helps soften hair and reduce frizz without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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