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 20,303
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

Polyquaternium-13

Polyquaternium-13

4.0

A gentle synthetic polymer that smooths hair and skin without heavy buildup, but may not suit those avoiding silicones or synthetic ingredients.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-14

Polyquaternium-14

3.8

Polyquaternium-14 is a gentle conditioning polymer that helps reduce frizz and static in hair while adding a smooth, silky feel.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Polyquaternium-15

Polyquaternium-15

3.5

Polyquaternium-15 is a synthetic polymer that helps reduce static and improve the feel of hair and skin, but its use has declined due to concerns about formaldehyde release.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-16

Polyquaternium-16

3.8

Polyquaternium-16 is a synthetic conditioning polymer that helps reduce frizz and static while improving the feel of hair and skin.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-17

Polyquaternium-17

4.0

Polyquaternium-17 is a gentle conditioning polymer that helps reduce frizz and static without heavy buildup, making it a good choice for fine or normal hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-18

Polyquaternium-18

4.0

A gentle synthetic polymer that smooths hair and skin by forming a thin, flexible film, but may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-19

POLYQUATERNIUM-19

3.8

Polyquaternium-19 is a gentle synthetic polymer that helps hair feel smoother and reduces frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Polyquaternium-2

POLYQUATERNIUM-2

3.8

Polyquaternium-2 is a gentle conditioning polymer that reduces static and improves the feel of hair and skin without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-21

Polyquaternium-21

4.0

A gentle, water-soluble conditioning polymer that reduces static and adds slip to hair and skin products without heavy residue.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-22

Polyquaternium-22

4.0

A synthetic conditioning polymer that smooths hair and skin without heavy buildup, but may not suit very fine or low-porosity hair types.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-23

Polyquaternium-23

4.0

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

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-24

Polyquaternium-24

4.0

A gentle conditioning polymer that smooths hair and skin without heavy buildup, widely used in rinse-off and leave-on products.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-25

Polyquaternium-25

3.8

A gentle synthetic polymer that smooths hair and reduces static, but offers minimal deep repair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-26

Polyquaternium-26

4.0

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

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-27

Polyquaternium-27

4.0

A gentle synthetic polymer that smooths hair and reduces flyaways without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-28

Polyquaternium-28

4.0

Polyquaternium-28 is a gentle conditioning polymer that helps detangle hair and reduce frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-29

Polyquaternium-29

4.0

A gentle, synthetic polymer that smooths hair and skin by forming a thin, flexible film.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm-former
Read ingredient review

Film Former

Polyquaternium-3

Polyquaternium-3

3.8

Polyquaternium-3 is a gentle conditioning polymer that helps reduce frizz and static while improving the feel of hair and skin, but it may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-30

Polyquaternium-30

3.8

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

Irritation

low

Source

synthetic

beautyskincarehair care
Read ingredient review

Film Former

Polyquaternium-31

Polyquaternium-31

4.0

A gentle synthetic polymer that smooths hair and skin without heavy buildup, making it a popular choice for sensitive scalps and fine hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-32

Polyquaternium-32

4.0

Polyquaternium-32 is a gentle synthetic polymer that smooths hair and skin, reduces static, and helps other ingredients spread evenly.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-33

Polyquaternium-33

4.0

Polyquaternium-33 is a gentle synthetic polymer that smooths hair and skin by forming a thin, flexible film, reducing static and improving texture without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-34

Polyquaternium-34

4.0

Polyquaternium-34 is a gentle conditioning polymer that smooths hair and skin without heavy buildup, making it a solid choice for sensitive scalps and fine hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-35

Polyquaternium-35

3.8

Polyquaternium-35 is a gentle, synthetic conditioning polymer that smooths hair and improves product feel without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-36

Polyquaternium-36

4.0

A gentle conditioning polymer that helps hair feel smooth and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm former
Read ingredient review

Film Former

Polyquaternium-37

Polyquaternium-37

4.0

A gentle synthetic polymer that smooths hair and skin without heavy buildup, ideal for sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Polyquaternium-38

Polyquaternium-38

3.8

A gentle conditioning polymer that smooths hair and adds slip without heavy buildup, but may not suit very fine or low-porosity hair if used in high amounts.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-39

Polyquaternium-39

3.8

A gentle conditioning polymer that helps hair and skin feel smooth and soft without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-4

Polyquaternium-4

3.8

A gentle conditioning polymer that reduces frizz and static in hair without heavy buildup, but may not suit very fine or low-porosity hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Polyquaternium-40

Polyquaternium-40

3.8

Polyquaternium-40 is a gentle conditioning polymer that helps reduce frizz and static while improving the feel of hair and skin, but it may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-41

Polyquaternium-41

3.8

A gentle conditioning polymer that smooths hair and skin without heavy buildup, but offers limited active benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-43

Polyquaternium-43

4.0

A gentle, film-forming polymer that smooths hair and skin without heavy buildup, making it a versatile choice for sensitive scalps and fine hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-45

Polyquaternium-45

4.0

A gentle synthetic polymer that smooths hair and reduces flyaways without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm former
Read ingredient review

Film Former

Polyquaternium-46

Polyquaternium-46

4.0

Polyquaternium-46 is a gentle, film-forming polymer that helps reduce frizz and static in hair while adding a silky feel, but it may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-47

POLYQUATERNIUM-47

4.0

A gentle conditioning polymer that smooths hair and skin without heavy buildup, ideal for sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-48

Polyquaternium-48

4.0

A gentle synthetic polymer that smooths hair and skin without heavy buildup, ideal for sensitive scalps.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-50

Polyquaternium-50

4.0

Polyquaternium-50 is a gentle conditioning polymer that helps hair feel soft and smooth without heavy buildup, and it's generally well-tolerated on skin.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Humectant

Polyquaternium-51

POLYQUATERNIUM-51

4.2

A gentle, synthetic humectant that mimics the skin's natural moisturizing factors, offering lasting hydration without stickiness.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Film Former

Polyquaternium-52

POLYQUATERNIUM-52

4.2

A gentle, film-forming polymer that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-53

POLYQUATERNIUM-53

4.0

A gentle, film-forming polymer that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-54

POLYQUATERNIUM-54

4.0

Polyquaternium-54 is a gentle, film-forming polymer that helps reduce frizz and static while improving the feel of hair and skin.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-55

Polyquaternium-55

3.8

Polyquaternium-55 is a synthetic conditioning polymer that helps reduce static, smooth hair, and improve the feel of rinse-off products without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Polyquaternium-56

Polyquaternium-56

4.0

Polyquaternium-56 is a gentle synthetic polymer that helps hair feel smooth and reduces frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-57

Polyquaternium-57

4.0

Polyquaternium-57 is a gentle synthetic polymer that smooths hair and skin by forming a thin, flexible film, but it may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Polyquaternium-6

Polyquaternium-6

3.8

Polyquaternium-6 is a reliable antistatic polymer that smooths hair and reduces flyaways, but it can build up on fine or low-porosity hair over time.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-60

Polyquaternium-60

4.0

Polyquaternium-60 is a gentle conditioning polymer that helps reduce frizz and static while improving the feel of hair and skin without common irritation.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-61

Polyquaternium-61

4.0

Polyquaternium-61 is a gentle conditioning polymer that reduces static and improves feel in hair and skin products.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-62

Polyquaternium-62

4.0

Polyquaternium-62 is a gentle synthetic polymer that smooths hair and reduces flyaways without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm former
Read ingredient review

Film Former

Polyquaternium-63

Polyquaternium-63

4.0

A gentle synthetic polymer that helps hair feel soft, reduces frizz, and protects color without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-64

Polyquaternium-64

3.8

Polyquaternium-64 is a gentle conditioning polymer that helps detangle hair and improve skin feel without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-65

Polyquaternium-65

4.0

Polyquaternium-65 is a gentle conditioning polymer that smooths hair and skin without heavy buildup, making it a popular choice for sensitive scalps and daily use.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-66

Polyquaternium-66

4.0

A gentle synthetic polymer that smooths hair and skin without heavy buildup, but may not suit very fine or low-porosity hair.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm former
Read ingredient review

Film Former

Polyquaternium-67

POLYQUATERNIUM-67

4.0

Polyquaternium-67 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

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-69

Polyquaternium-69

3.8

Polyquaternium-69 is a gentle synthetic polymer that smooths hair and reduces static without heavy buildup, making it a good choice for fine or easily weighed-down hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic agent

Polyquaternium-7

POLYQUATERNIUM-7

4.0

Polyquaternium-7 is a gentle conditioning polymer that helps reduce frizz and static in hair without heavy buildup, making it a common choice in shampoos and conditioners.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-70

Polyquaternium-70

4.0

Polyquaternium-70 is a gentle, film-forming polymer that smooths hair and skin without heavy buildup, making it a solid choice for sensitive scalps and dry hair.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Polyquaternium-71

Polyquaternium-71

4.0

Polyquaternium-71 is a gentle conditioning polymer that smooths hair and skin without heavy buildup, making it a good choice for fine hair and sensitive skin.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-72

Polyquaternium-72

4.0

Polyquaternium-72 is a gentle conditioning polymer that helps reduce frizz and static in hair without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Polyquaternium-73

Polyquaternium-73

4.0

A gentle synthetic polymer that smooths hair and skin by forming a light, non-sticky film, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm former
Read ingredient review