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

Myristamidopropylalkonium Chloride

Myristamidopropylalkonium 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
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Emollient

Myristyl Trisiloxane

MYRISTYL TRISILOXANE

4.0

A lightweight silicone that smooths skin and hair without heaviness, generally well-tolerated but not biodegradable.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Preservative

Myrtrimonium Bromide

Myrtrimonium Bromide

3.0

An effective preservative and antistatic agent, but may cause irritation for sensitive skin or eyes.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Film Former

Norbornene Siloxane Copolymer

NORBORNENE/TRIS(TRIMETHYLSILOXY)SILYLNORBORNENE COPOLYMER

4.0

A silicone polymer that helps makeup and skincare stay put without feeling heavy or greasy.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Surfactant

Oatamide MEA

Oatamide MEA

4.0

Oatamide MEA is a mild, oat-based ingredient that helps cleansers foam gently while leaving skin and hair feeling soft and conditioned.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Oatamidopropyl Betaine

Oatamidopropyl Betaine

4.3

A gentle, plant-based surfactant that cleans without stripping, ideal for sensitive or dry skin.

Irritation

low

Source

natural

beautyskincarehaircaresurfactant
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Conditioning agent

Oatamidopropyl Dimethylamine

Oatamidopropyl Dimethylamine

4.2

A mild, plant-derived conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Octacosatrimonium Chloride

Octacosatrimonium Chloride

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

beautyskincarehaircare
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Antistatic Agent

Octyldodecyltrimonium Chloride

Octyldodecyltrimonium Chloride

3.8

A synthetic conditioning agent that reduces static and improves manageability, but may cause irritation for sensitive scalps.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

Olealkonium Chloride

Olealkonium Chloride

3.5

Olealkonium Chloride is a mild conditioning agent that helps reduce static and improve manageability, but it can be irritating for sensitive skin or eyes at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Conditioning Agent

Oleamidopropyl Dimethylamine

OLEAMIDOPROPYL DIMETHYLAMINE

4.0

A gentle conditioning ingredient that helps detangle hair and soften skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Conditioning Agent

Oleamidopropyl Dimethylamine Lactate

Oleamidopropyl Dimethylamine Lactate

4.0

A gentle conditioning ingredient that helps soften hair and skin without heavy buildup, making it a good choice for fine hair or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Oleamidopropyl PG-Dimonium Chloride

Oleamidopropyl PG-Dimonium Chloride

4.0

A gentle conditioning ingredient that reduces static and softens hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Surfactant

Oleyl Betaine

Oleyl Betaine

4.0

A gentle, low-irritation surfactant that cleans without stripping the skin or hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Oleyl Hydroxyethyl Imidazoline

Oleyl Hydroxyethyl Imidazoline

3.5

A synthetic antistatic agent that helps soften hair and reduce flyaways, but may be irritating for sensitive scalps or acne-prone skin.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Surfactant

Olivamidopropyl Betaine

OLIVAMIDOPROPYL BETAINE

4.5

A gentle, olive oil-derived surfactant that cleans without stripping the skin, ideal for sensitive skin and baby care.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Conditioning Agent

Olivamidopropyl Dimethylamine

Olivamidopropyl Dimethylamine

4.2

A gentle, olive-oil-derived conditioner that softens hair and skin without heavy buildup, ideal for sensitive scalps.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Olivamidopropylamine Oxide

Olivamidopropylamine Oxide

4.0

A gentle, plant-derived surfactant that cleanses without stripping the skin, making it ideal for sensitive skin and daily use.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antistatic Agent

Olivamidopropyltrimonium Chloride

Olivamidopropyltrimonium Chloride

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Film Former

Olive Oil Wheat Protein

OLIVOYL HYDROLYZED WHEAT PROTEIN

4.0

A gentle, plant-derived conditioning ingredient that helps hair and skin feel soft and smooth without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Colorant

P-Methylaminophenol Sulfate

P-METHYLAMINOPHENOL SULFATE

3.5

A common synthetic ingredient in permanent hair dyes that helps create rich, lasting color but can cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyhaircarecolorant
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Antistatic Agent

Palmidopropyl Dimonium Chloride

Palmidoethyl Palmoylpropyl Dimonium Chloride

3.8

A gentle conditioning ingredient that reduces static and improves hair manageability, but its palm oil origin raises sustainability questions.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Palmitoyl Keratin Amino Acids

Palmitoyl Keratin Amino Acids

4.0

A gentle conditioning ingredient that helps strengthen hair and soften skin by delivering keratin amino acids with a fatty acid anchor.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Conditioning agent

Palmitoyl Oat Amino Acids

Palmitoyl Oat Amino Acids

4.2

A mild, oat-derived conditioning ingredient that leaves skin and hair feeling soft without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Hair Conditioning Agent

Palmitoyl Silk Amino Acids

Palmitoyl Silk Amino Acids

4.0

A gentle, silk-derived conditioning agent that helps smooth hair and soften skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Conditioning Agent

Passion Fruit & Palm Oil Conditioning Complex

PASSIFLORA EDULIS SEED OIL/PALM OIL/ AMINOPROPANEDIOL ESTERS ACETATE ETHYLDIMONIUM CHLORIDE

3.8

A gentle conditioning agent that helps soften hair and skin without heavy buildup, but its palm oil source raises sustainability questions.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Conditioning Agent

Pea Protein Surfactant

CETEARAMIDOETHYL DIETHONIUM ISOSTEAROYL HYDROLYZED PEA PROTEIN

4.0

A mild, protein-based conditioning ingredient that helps hair feel soft and manageable without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Peanutamide MIPA

PEANUTAMIDE MIPA

3.5

Peanutamide MIPA is a gentle conditioning agent that helps soften hair and skin, but it may not be suitable for those with peanut allergies or acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Emulsifier

PEG-10 Hydrogenated Tallow Amine

PEG-10 Hydrogenated Tallow Amine

3.5

A synthetic emulsifier that helps blend oil and water in products, but may be irritating for sensitive skin and has moderate comedogenic potential.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
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Antistatic Agent

PEG-10 Stearyl Benzonium Chloride

PEG-10 Stearyl Benzonium Chloride

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarehaircaresurfactant
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Emollient

PEG-12 Dimethicone

PEG-12 Dimethicone

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarehaircareemollient
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