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

Antistatic Agent

Quaternium-72

Quaternium-72

3.5

Quaternium-72 is a synthetic conditioning ingredient that helps reduce static and improve manageability in hair products, with a low risk of irritation for most users.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Quaternium-75

Quaternium-75

4.0

A gentle, plant-derived conditioning agent that reduces frizz and static without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review

Conditioning Agent

Quaternium-76 Hydrolyzed Collagen

Quaternium-76 Hydrolyzed Collagen

3.8

A gentle conditioning ingredient that helps reduce static and improve manageability in hair products, with mild film-forming benefits for skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-77

Quaternium-77

3.5

A synthetic conditioning agent that helps reduce frizz and static in hair, but may not suit all hair types.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-78

Quaternium-78

3.8

A gentle synthetic conditioner that reduces static and smooths hair without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Hair conditioning agent

Quaternium-79 Hydrolyzed Keratin

Quaternium-79 Hydrolyzed Keratin

4.0

A gentle, protein-based conditioner that helps strengthen hair and reduce frizz without weighing it down.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review

Hair Conditioning Agent

Quaternium-79 Hydrolyzed Milk Protein

QUATERNIUM-79 HYDROLYZED MILK PROTEIN

3.8

A gentle conditioning ingredient that makes hair and skin feel softer and more manageable without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Hair Conditioner

Quaternium-79 Hydrolyzed Silk

Quaternium-79 Hydrolyzed Silk

4.0

A gentle conditioning ingredient that helps hair feel soft and smooth while reducing static and flyaways.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-8

Quaternium-8

3.5

A gentle synthetic conditioner that helps detangle hair and reduce flyaways, but offers no long-term repair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-80

Quaternium-80

3.8

Quaternium-80 is a gentle conditioning ingredient that reduces static and softens hair, but it may not suit very sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-81

Quaternium-81

3.5

A synthetic conditioning agent that helps reduce frizz and static, but offers limited skin benefits beyond temporary smoothness.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-83

Quaternium-83

3.5

Quaternium-83 is a synthetic conditioning agent that helps reduce static and improve manageability in hair products, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-85

Quaternium-85

3.8

A gentle synthetic conditioner that smooths hair and reduces static, but may build up with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Quaternium-86

Quaternium-86

3.5

Quaternium-86 is a synthetic conditioning ingredient that helps reduce static and improve manageability in hair products, but it may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-87

Quaternium-87

3.5

Quaternium-87 is a synthetic conditioning ingredient that helps reduce static and soften hair, but it may not suit very sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-88

Quaternium-88

4.0

Quaternium-88 is a gentle conditioning polymer that smooths hair and skin without heavy buildup, making it a popular choice for sensitive scalps and fine hair.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Quaternium-89

Quaternium-89

4.0

A gentle synthetic conditioning agent that reduces frizz and static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Antistatic Agent

Quaternium-90

Quaternium-90

3.5

Quaternium-90 is a synthetic conditioning ingredient that helps reduce static and improve manageability in hair products, but it may not suit very sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Viscosity controlling agent

Quaternium-90 Montmorillonite

Quaternium-90 Montmorillonite

3.8

A modified clay that helps control oil and improve product feel, generally safe but not well-studied in long-term use.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-91

Quaternium-91

3.8

A gentle synthetic conditioner that helps detangle hair and reduce flyaways without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Quaternium-92

Quaternium-92

3.8

A synthetic conditioning ingredient that helps detangle hair and reduce frizz with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-93

Quaternium-93

3.5

Quaternium-93 is a synthetic conditioning ingredient that helps reduce frizz and static in hair, but it may not suit those with very sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Quaternium-96

Quaternium-96

3.8

A synthetic conditioning agent that helps reduce static and improve the feel of hair and skin, generally well-tolerated but not a standout active.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Quaternium-97

Quaternium-97

3.8

Quaternium-97 is a synthetic conditioning ingredient that helps reduce frizz and static while making hair feel softer and easier to manage.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Rapeseed/Tung Oil Copolymer

BRASSICA CAMPESTRIS/ALEURITES FORDI OIL COPOLYMER

4.0

A plant-derived film former that helps makeup and sunscreen stay put longer without feeling heavy or sticky.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarefilm-former
Read ingredient review

Conditioning Agent

Ricinolamidopropyl Dimethylamine

RICINOLEAMIDOPROPYL DIMETHYLAMINE

4.0

A gentle, castor-oil-derived conditioning agent that softens hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Ricinolamidopropyl Dimethylamine Lactate

RICINOLEAMIDOPROPYL DIMETHYLAMINE LACTATE

4.0

A gentle, castor-oil-derived conditioning ingredient that smooths hair without heavy buildup, ideal for fine or oily hair types.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review

Film Former

Ricinolate Adipate Copolymer

RICINOLEIC ACID/ADIPIC ACID/AEEA COPOLYMER

3.8

A safe, effective film-former that helps makeup and hair products last longer without feeling stiff or heavy.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Ricinus-Based Conditioning Agent

RICINOLEAMIDOPROPYLTRIMONIUM METHOSULFATE

4.0

A gentle, castor-oil-derived conditioning ingredient that helps detangle and soften hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Rosin Hydrolyzed Collagen

Rosin Hydrolyzed Collagen

3.5

Rosin Hydrolyzed Collagen is a hybrid ingredient that adds hold and shine to hair and makeup while offering some conditioning, but it's not a true collagen treatment for skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Surfactant

Shea Butteramidopropyl Betaine

Shea Butteramidopropyl Betaine

4.0

A gentle, shea-derived surfactant that cleanses without stripping, making it a good choice for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Silicone Acrylate Copolymer

Butyl Acrylate/Laureth Methacrylate/Methacryloyloxypropyl Dimethicone Copolymer

3.5

A synthetic film-former that helps products stay put, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Silicone Copolymer Blend

PEG-40/PPG-8 Methylaminopropyl/Hydroxypropyl Dimethicone Copolymer

3.8

A versatile silicone copolymer that improves product feel and water resistance with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Silicone Quaternium-1

Silicone Quaternium-1

4.0

A gentle, water-soluble silicone that smooths hair and skin without the heavy feel of traditional silicones.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Hair Conditioning Agent

Silicone Quaternium-10

Silicone Quaternium-10

4.0

Silicone Quaternium-10 is a gentle conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Hair Conditioner

Silicone Quaternium-11

Silicone Quaternium-11

4.0

Silicone Quaternium-11 is a gentle conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Silicone Quaternium-12

Silicone Quaternium-12

4.0

Silicone Quaternium-12 is a gentle conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Conditioning Agent

Silicone Quaternium-15

Silicone Quaternium-15

3.8

A gentle conditioning silicone that helps detangle and soften hair without heavy buildup, but may not suit those avoiding all silicones.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Conditioning Agent

Silicone Quaternium-16

Silicone Quaternium-16

4.0

Silicone Quaternium-16 is a gentle conditioning ingredient that smooths hair and skin without heavy buildup, but it may not suit those avoiding silicones entirely.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Silicone Quaternium-16 Crosspolymer

Silicone Quaternium-16/Glycidoxy Dimethicone Crosspolymer

4.0

A gentle, positively charged silicone that smooths hair and reduces static without the heavy feel of traditional silicones.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Antistatic Agent

Silicone Quaternium-17

Silicone Quaternium-17

3.8

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

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Antistatic Agent

Silicone Quaternium-18

Silicone Quaternium-18

4.0

Silicone Quaternium-18 is a gentle conditioning ingredient that smooths hair and reduces static, but may build up over time with infrequent washing.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Hair Conditioner

Silicone Quaternium-19

Silicone Quaternium-19

4.0

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

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Silicone Quaternium-2

Silicone Quaternium-2

3.8

Silicone Quaternium-2 is a gentle, positively charged silicone that smooths hair and reduces frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Hair Conditioner

Silicone Quaternium-2 Panthenol Succinate

Silicone Quaternium-2 Panthenol Succinate

4.0

A gentle conditioning ingredient that helps detangle hair and soften skin without heavy buildup, thanks to its silicone and panthenol components.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Silicone Quaternium-20

Silicone Quaternium-20

3.8

A gentle conditioning silicone that smooths hair and reduces static, but may build up on fine or low-porosity hair over time.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Antistatic Agent

Silicone Quaternium-21

Silicone Quaternium-21

4.0

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

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review