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

Hydrolyzed Starch Conditioner

Hydrogenated Starch Hydrolysate Hydroxypropyltrimonium Chloride

4.0

A gentle, starch-derived conditioner that reduces frizz and static without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Hydrolyzed Sulfonated Keratin

HYDROLYZED SULFONATED KERATIN

4.0

A gentle, modified keratin protein that helps strengthen and smooth hair while adding a light protective film to skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarefilm former
Read ingredient review

Film Former

Hydrolyzed Wheat Protein Complex

WHEATGERMAMIDOPROPYL DIMETHYLAMINE HYDROLYZED WHEAT PROTEIN

4.0

A gentle, protein-based conditioner that helps strengthen hair and leaves skin feeling smooth without heavy residue.

Irritation

low

Source

natural

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

Hydrolyzed Wheat Protein PG-Propyl Silanetriol

HYDROLYZED WHEAT PROTEIN PG-PROPYL SILANETRIOL

4.0

A gentle film-forming ingredient that helps hair feel smoother and skin look more refined, but may not suit those avoiding wheat-derived components.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarefilm-former
Read ingredient review

Hair Conditioning Agent

Hydrolyzed Wheat Protein Siloxysilicate

HYDROXYPROPYLTRIMONIUM HYDROLYZED WHEAT PROTEIN/SILOXYSILICATE

4.0

A gentle conditioning 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

beautyskincarehaircareconditioning agent
Read ingredient review

Surfactant

Hydrolyzed Wheat Protein Surfactant

SODIUM/TEA-UNDECYLENOYL HYDROLYZED WHEAT PROTEIN

4.0

A mild, protein-based cleanser that helps clean skin and hair while leaving them feeling soft and conditioned.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
Read ingredient review

Film Former

Hydrolyzed Wool Cuticle Protein

HYDROLYZED WOOL CUTICLE PROTEIN

3.8

A gentle protein derived from wool that helps strengthen hair and temporarily smooth the skin's surface, but may not be suitable for those with wool allergies.

Irritation

low

Source

natural

beautyskincarehaircare
Read ingredient review

Antistatic agent

Hydroxyethyl Acetomonium PG-Dimethicone

HYDROXYETHYL ACETOMONIUM PG-DIMETHICONE

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Hydroxyethyl Cetyldimonium Chloride

HYDROXYETHYL CETYLDIMONIUM CHLORIDE

3.8

A synthetic conditioning ingredient that reduces frizz and improves manageability, but may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Antistatic Agent

Hydroxyethyl Oleyl Dimonium Chloride

Hydroxyethyl Oleyl Dimonium Chloride

3.8

A synthetic conditioning agent that reduces static and softens hair, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Hydroxyethyl PEI-1500

Hydroxyethyl PEI-1500

3.8

A synthetic polymer that helps products spread smoothly and forms a flexible film for hold and feel.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Surfactant

Hydroxyethyl Stearamide-MIPA

Hydroxyethyl Stearamide-MIPA

3.5

A mild synthetic ingredient that helps create rich lather and a silky after-feel in cleansers, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Conditioning Agent

Hydroxyethyl Tallowdimonium Chloride

Hydroxyethyl Tallowdimonium Chloride

3.5

An effective hair and skin conditioner derived from tallow, but may cause irritation or clog pores in sensitive or acne-prone individuals.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Hydroxypropyl Biscetearyldimonium Chloride

Hydroxypropyl Biscetearyldimonium Chloride

3.5

A gentle synthetic conditioning agent that helps detangle and soften hair without heavy buildup, but may not suit those avoiding quaternary ammonium compounds.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Hair Conditioning Agent

Hydroxypropyl Bislauramide MEA

Hydroxypropyl Bislauramide MEA

3.8

A gentle synthetic ingredient that helps hair feel soft and smooth without heavy buildup, but it's not a star performer on its own.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Skin conditioner

Hydroxypropyldimethicone

Hydroxypropyldimethicone

4.0

A gentle silicone that improves product feel and spreadability with a very low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Hydroxypropyltrimonium Gelatin

Hydroxypropyltrimonium Gelatin

3.8

A gentle, protein-derived conditioning ingredient that helps reduce static and smooth hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Hair Conditioning Agent

Hydroxypropyltrimonium Honey

Hydroxypropyltrimonium Honey

4.0

A gentle, positively charged honey derivative that helps hair and skin retain moisture and reduces static without the stickiness of raw honey.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Hair conditioning agent

Hydroxypropyltrimonium Hydrolyzed Casein

HYDROXYPROPYLTRIMONIUM HYDROLYZED CASEIN

4.0

A gentle, protein-based conditioning ingredient that helps strengthen hair and improve manageability with low irritation risk.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Hair Conditioning Agent

Hydroxypropyltrimonium Hydrolyzed Keratin

Hydroxypropyltrimonium Hydrolyzed Keratin

4.0

A gentle, positively charged keratin derivative that bonds to damaged hair to improve strength, smoothness, and manageability without buildup.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review