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

Surfactant

Potassium Abietoyl Hydrolyzed Collagen

POTASSIUM ABIETOYL HYDROLYZED COLLAGEN

3.8

A gentle, amino-acid-based surfactant that cleanses without stripping, making it a good choice for sensitive or dry skin and hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Film Former

Potassium Undecylenoyl Alginate

Potassium Undecylenoyl Alginate

4.0

A gentle film-forming ingredient from seaweed that helps soothe and protect skin and hair without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Potato Protein Copolymer

Ethyltrimonium Chloride Methacrylate/Hydrolyzed Potato Protein Copolymer

4.0

A gentle, protein-based conditioning ingredient that helps detangle hair and add softness without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

PPG-1 Hydroxyethyl Caprylamide

PPG-1 HYDROXYETHYL CAPRYLAMIDE

3.8

A mild synthetic ingredient that helps products feel silky and spread easily, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

PPG-1 Hydroxypropyltrimonium Cassia

PPG-1 HYDROXYPROPYLTRIMONIUM CASSIA

4.0

A gentle, plant-derived conditioning ingredient that helps detangle hair and improve manageability without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

PPG-1/PEG-1 Stearamine

PPG-1/PEG-1 Stearamine

3.5

A synthetic conditioning agent that helps reduce static and soften hair, generally considered safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Surfactant

PPG-2 Hydrogenated Tallowamine

PPG-2 HYDROGENATED TALLOWAMINE

3.5

A synthetic conditioning ingredient that can improve hair feel but may cause irritation or clog pores for some skin types.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Surfactant

PPG-2 Lauryl Ether Maleamide

PPG-2 LAURYL ETHER MALEAMIDE

3.5

A mild synthetic ingredient that helps hair feel soft and smooth, but it's not a star player and is best understood as part of a larger formula.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic agent

PPG-25 Diethylmonium Chloride

PPG-25 Diethylmonium Chloride

4.0

A gentle synthetic conditioning agent that helps reduce static and smooth hair without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Film Former

PPG-26/HDI Copolymer

PPG-26/HDI Copolymer

3.8

A synthetic polymer that helps products stay put, resist water, and feel lightweight, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

PPG-3 Hydroxyethyl Soyamide

PPG-3 Hydroxyethyl Soyamide

4.0

A gentle, soy-derived conditioning ingredient that helps soften skin and hair without clogging pores or causing irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

PPG-3 Tallow Aminopropylamine

PPG-3 Tallow Aminopropylamine

3.5

A conditioning ingredient that can improve hair manageability but may be irritating or comedogenic for some.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

PPG-40 Diethylmonium Chloride

PPG-40 DIETHYLMONIUM CHLORIDE

3.5

A synthetic conditioning ingredient that helps reduce static and soften hair, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

PPG-51/SMDI Copolymer

PPG-51/SMDI Copolymer

3.8

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

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

PPG-70 Bis-(2-Aminopropyl) Ether

PPG-70 BIS-(2-AMINOPROPYL) ETHER

3.8

A gentle synthetic polymer that helps hair feel smooth and products spread evenly, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

PPG-9 Diethylmonium Chloride

PPG-9 Diethylmonium Chloride

3.8

A synthetic conditioning ingredient that helps reduce static and soften hair, but may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Propyl Steardimonium Chloride

Propyl Steardimonium Chloride

3.5

An effective hair conditioner and antistatic agent, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Emollient

Propyl Trisiloxane

Propyl Trisiloxane

4.0

A lightweight silicone that gives a smooth, silky feel without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Hair conditioning agent

Propyltrimonium Hydrolyzed Wheat Protein

PROPYLTRIMONIUM HYDROLYZED WHEAT PROTEIN

4.0

A gentle, positively charged wheat protein that coats hair to improve softness, manageability, and shine without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Film Former

PVP

PVP

3.8

PVP is a safe, synthetic film-former that helps products stay put and feel smooth, but it can feel stiff or tacky in high concentrations.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm-former
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Anti-hair loss agent

Pyrrolidinyl Diaminopyrimidine Oxide

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE

3.8

A synthetic ingredient that may help slow hair thinning by reducing collagen buildup around hair follicles, but results vary and it works best as part of a comprehensive hair care routine.

Irritation

low

Source

synthetic

beautyhaircareactive
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Preservative

Quaternium-14

Quaternium-14

3.0

Quaternium-14 is an effective preservative and antistatic agent, but its potential for skin irritation means it is best suited for rinse-off products.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-16

Quaternium-16

3.8

A synthetic conditioning ingredient that reduces static and softens hair, but may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-18 Methosulfate

Quaternium-18 Methosulfate

3.8

A synthetic conditioning ingredient that helps reduce static and improve manageability, but may be too heavy for fine or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-22

Quaternium-22

4.0

Quaternium-22 is a gentle conditioning ingredient that reduces static and improves feel in hair and skin products, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-24

Quaternium-24

4.0

Quaternium-24 is a gentle conditioning ingredient that helps reduce frizz and static without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-27

Quaternium-27

3.5

Quaternium-27 is a mild conditioning ingredient that helps detangle hair and reduce static, but it may not suit very fine or easily weighed-down hair types.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-30

Quaternium-30

3.8

Quaternium-30 is a synthetic conditioning ingredient that helps reduce frizz and static in hair while adding a silky feel, but it may not suit those avoiding silicones or heavy polymers.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-33

Quaternium-33

3.5

Quaternium-33 is a synthetic conditioning ingredient that helps reduce static and improve manageability, but it may cause irritation for sensitive skin or clog pores in some people.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-45

Quaternium-45

3.8

Quaternium-45 is a synthetic conditioning ingredient that reduces static and improves manageability in hair products, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-51

Quaternium-51

3.8

Quaternium-51 is a gentle synthetic conditioner that helps reduce static and improve the feel of hair and skin without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-52

Quaternium-52

3.8

Quaternium-52 is a gentle synthetic conditioner that reduces frizz and static without heavy buildup, but it offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-53

Quaternium-53

3.8

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

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-56

Quaternium-56

3.8

Quaternium-56 is a synthetic conditioning agent that reduces static and improves hair feel, but its benefits are mostly cosmetic and temporary.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-60

Quaternium-60

3.8

Quaternium-60 is a synthetic conditioning agent that reduces static and improves manageability in hair products, with a low risk of irritation for most users.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-61

Quaternium-61

3.8

A gentle conditioning ingredient that helps reduce static and improve manageability in hair products, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehaircaresurfactant
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Antistatic Agent

Quaternium-63

Quaternium-63

4.0

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

Irritation

low

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Quaternium-71

Quaternium-71

3.8

Quaternium-71 is a gentle synthetic conditioner that helps detangle hair and soften skin without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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