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 20,769
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

Lauramide DIPA

Lauramide DIPA

3.5

Lauramide DIPA helps create rich lather in cleansers but may be mildly irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Foam Booster

Lauramide MEA

Lauramide MEA

3.5

Lauramide MEA helps create rich lather and thick texture in cleansers, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Foam Booster

Lauramide MIPA

Lauramide MIPA

3.5

Lauramide MIPA helps create rich lather in cleansers but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Lauramide/Myristamide DEA

LAURAMIDE/MYRISTAMIDE DEA

3.5

An effective foam booster and thickener, but its potential to form nitrosamines makes it a controversial choice in modern formulations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Hair Conditioning Agent

Lauramidobutyl Guanidine Acetate

Lauramidobutyl Guanidine Acetate

3.8

A synthetic hair conditioning agent that helps soften and detangle hair, but is not widely studied for long-term effects.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Lauramidobutyl Guanidine HCl

Lauramidobutyl Guanidine HCl

3.8

A synthetic hair conditioning agent that helps detangle and soften hair without heavy buildup, but has limited research on long-term effects.

Irritation

low

Source

synthetic

beautyskincarehair careconditioning agent
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Surfactant

Lauramidopropyl Betaine

Lauramidopropyl Betaine

4.0

A gentle, coconut-based surfactant that helps cleansers lather without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Conditioning Agent

Lauramidopropyl Dimethylamine

Lauramidopropyl Dimethylamine

3.8

A mild conditioning agent that helps detangle hair and soften skin, but may cause irritation for sensitive types at high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Surfactant

Lauramidopropyl Hydroxysultaine

Lauramidopropyl Hydroxysultaine

4.0

A gentle, coconut-derived surfactant that cleans without stripping the skin, making it ideal for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Surfactant

Lauramine Oxide

Lauramine Oxide

3.8

A gentle surfactant that helps create rich foam and stabilize formulas, but may cause mild irritation in sensitive skin at high concentrations.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Lauramino Propylene Glycol

Lauramino Propylene Glycol

3.5

A mild cleansing agent that helps foam and rinse away dirt, but may cause irritation for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

Lauraminopropionic Acid

Lauraminopropionic Acid

4.0

A gentle, amino-acid-based surfactant that cleanses without stripping the skin, making it ideal for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Lauraminopropylamine

LAURAMINOPROPYLAMINE

3.5

Lauraminopropylamine is a synthetic surfactant that helps cleanse and condition hair and skin, but it may cause irritation in sensitive individuals at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Conditioning Agent

Laurdimonium Hydroxypropyl Amino Acid Complex

LAURDIMONIUM HYDROXYPROPYL (ARGININE/GLUTAMIC ACID/ISOLEUCINE/LEUCINE/LYSINE/PHENYLALANINE/PROLINE/THREONINE/VALINE)

4.0

A gentle conditioning ingredient that helps detangle hair and soften skin without heavy buildup, suitable for sensitive types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioning Agent

Laurdimonium Hydroxypropyl Hydrolyzed Casein

LAURDIMONIUM HYDROXYPROPYL HYDROLYZED CASEIN

4.0

A gentle, protein-based conditioning ingredient that helps smooth hair and lightly moisturize skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Emulsifier

Laureth

Laureth

3.5

Laureth ingredients help blend oil and water in formulas, but some types can be mildly drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansingemulsifier
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Surfactant

Laureth-1 Phosphate

LAURETH-1 PHOSPHATE

3.5

A mild, phosphate-based surfactant that helps cleanse without stripping the skin, but may not suit ultra-sensitive types.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-10

Laureth-10

3.5

A gentle cleansing and emulsifying ingredient that helps products rinse clean without stripping the skin, but may not suit those avoiding ethoxylated compounds.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-10 Carboxylic Acid

LAURETH-10 CARBOXYLIC ACID

4.0

A gentle, low-irritation cleansing ingredient that helps remove dirt and oil without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Laureth-100

LAURETH-100

4.0

Laureth-100 is a gentle, high-foam surfactant and emulsifier that helps blend oil and water in cleansers and serums, with a very low irritation profile.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-11

Laureth-11

4.0

Laureth-11 is a gentle surfactant and emulsifier that helps cleanse without stripping the skin, making it a good choice for sensitive skin formulations.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Laureth-11 Carboxylic Acid

LAURETH-11 CARBOXYLIC ACID

4.0

A gentle, non-stripping surfactant that effectively cleanses while being kinder to the skin barrier than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Laureth-12 Carboxylic Acid

LAURETH-12 CARBOXYLIC ACID

4.0

A gentle, semi-synthetic surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Laureth-12 Succinate

LAURETH-12 SUCCINATE

3.5

A gentle synthetic surfactant that helps cleanse without over-drying, but offers no active skincare benefits beyond cleaning.

Irritation

low

Source

synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Laureth-13

LAURETH-13

3.5

Laureth-13 is a synthetic cleansing agent that helps products foam and rinse clean, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-13 Carboxylic Acid

Laureth-13 Carboxylic Acid

4.0

A gentle, low-irritation surfactant that helps cleansers foam and remove dirt without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-14

Laureth-14

3.5

An effective cleansing agent that can strip the skin's natural oils if used too frequently or in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Laureth-14 Carboxylic Acid

LAURETH-14 CARBOXYLIC ACID

3.8

A gentle, effective surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-15

Laureth-15

3.5

Laureth-15 is a synthetic emulsifier that helps products spread and foam, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-16

Laureth-16

3.8

Laureth-16 is a gentle surfactant and emulsifier that helps products foam and rinse cleanly, but it may be slightly drying for very sensitive skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-17 Carboxylic Acid

LAURETH-17 CARBOXYLIC ACID

4.0

A gentle, semi-synthetic surfactant that helps cleanse without stripping the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-2

Laureth-2

3.8

A gentle surfactant that helps blend oil and water, making it a common but mild cleansing ingredient.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Laureth-2 Acetate

Laureth-2 Acetate

3.8

Laureth-2 Acetate is a gentle synthetic surfactant that helps cleanse without over-drying, making it a good option for sensitive skin.

Irritation

low

Source

synthetic

beautyskincarecleansing
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Emollient

Laureth-2 Benzoate

LAURETH-2 BENZOATE

3.8

A synthetic emollient that helps products feel silky and spread easily, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Laureth-2 Ethylhexanoate

LAURETH-2 ETHYLHEXANOATE

4.0

A lightweight synthetic emollient that improves product texture and skin feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Surfactant

Laureth-2 Phosphate

LAURETH-2 PHOSPHATE

4.0

A gentle phosphate-based surfactant that helps cleanse without stripping the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-20

Laureth-20

3.8

Laureth-20 is a common cleansing and emulsifying ingredient that can be drying or irritating for sensitive skin, especially in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-23

Laureth-23

3.5

Laureth-23 is a reliable emulsifier but can be drying or irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-3

Laureth-3

4.0

A gentle cleansing agent that helps products foam and rinse clean without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-3 Phosphate

LAURETH-3 PHOSPHATE

3.8

A gentle surfactant that helps cleanse without stripping the skin, but may not suit those with very sensitive or compromised barriers.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-38

Laureth-38

4.0

A gentle, non-ionic surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review