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 1,097
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

Foam Booster

Isostearamide DEA

Isostearamide DEA

3.5

Isostearamide DEA helps create rich lather and thick texture in cleansers, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Isostearamide MEA

Isostearamide MEA

3.5

Isostearamide MEA is a mild synthetic ingredient that helps create rich lather and thicker textures in cleansers, but it offers no direct skin benefit beyond formulation.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Isosteareth-10

ISOSTEARETH-10

3.5

A gentle synthetic emulsifier that helps mix water and oil in creams and cleansers, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Isosteareth-12

ISOSTEARETH-12

3.8

A gentle synthetic emulsifier that helps mix oil and water in creams and cleansers, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Isosteareth-15

ISOSTEARETH-15

4.0

Isosteareth-15 is a gentle synthetic emulsifier that helps mix oil and water in skincare products, with a low risk of irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Isosteareth-16

ISOSTEARETH-16

3.8

Isosteareth-16 is a gentle synthetic emulsifier that helps mix oil and water in cleansers and lotions, with a low risk of irritation for most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Isosteareth-2 Phosphate

ISOSTEARETH-2 PHOSPHATE

4.0

A mild synthetic emulsifier that helps cleansers and lotions mix and rinse cleanly, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Isosteareth-20

ISOSTEARETH-20

4.0

A gentle synthetic emulsifier that helps mix water and oil in creams and cleansers, with a low irritation profile.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Isosteareth-25

ISOSTEARETH-25

3.8

A gentle synthetic surfactant that helps mix oil and water, commonly used in rinse-off products for its mild cleansing and emulsifying properties.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Isosteareth-3

ISOSTEARETH-3

3.5

Isosteareth-3 is a gentle synthetic emulsifier that helps mix oil and water in cleansers and creams, but it's an ethoxylate, which raises mild purity concerns for some users.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Isosteareth-5

ISOSTEARETH-5

4.0

Isosteareth-5 is a gentle synthetic emulsifier that helps mix oil and water in products, with a low risk of irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Isosteareth-50

ISOSTEARETH-50

4.0

A gentle cleansing and emulsifying ingredient that helps mix oil and water, making it useful in cleansers and shampoos without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Isosteareth-8

ISOSTEARETH-8

3.8

Isosteareth-8 is a gentle synthetic emulsifier that helps mix oil and water, but its PEG content raises mild environmental and purity concerns.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Isotridecyl Phosphate

Isotridecyl Phosphate

4.0

A mild synthetic emulsifier that helps products feel smooth and spread easily, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Jojoba Wax PEG-120 Esters

JOJOBA WAX PEG-120 ESTERS

4.0

A gentle, non-stripping emulsifier derived from jojoba wax that helps cleanse without drying out the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Jojoba Wax PEG-80 Esters

JOJOBA WAX PEG-80 ESTERS

4.0

A gentle, water-soluble cleanser derived from jojoba wax that effectively removes oil and makeup without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Keratin Amino Acid Surfactant

SODIUM/TEA-LAUROYL KERATIN AMINO ACIDS

4.0

A gentle, protein-derived surfactant that cleanses without stripping, making it a good choice for sensitive skin or damaged hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
Read ingredient review

Humectant

Lactamide DEA

Lactamide DEA

3.5

Lactamide DEA helps products feel creamy and foamy, but it's a synthetic ingredient with limited research on long-term skin benefits.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laneth-4 Phosphate

Laneth-4 Phosphate

3.5

Laneth-4 Phosphate is a synthetic emulsifier that helps mix oil and water, but it may cause irritation for sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

Laneth-5

LANETH-5

4.0

Laneth-5 is a gentle, lanolin-derived ingredient that helps soften skin and stabilize formulas, but those with wool allergies should patch-test first.

Irritation

low

Source

semi-synthetic

beautyskincareemollientsurfactant
Read ingredient review

Surfactant

Lanolinamide DEA

LANOLINAMIDE DEA

3.5

Lanolinamide DEA helps create rich lather and stabilize mixtures, but it may be mildly irritating or comedogenic for sensitive or acne-prone skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Lapyrium Chloride

LAPYRIUM CHLORIDE

3.5

Lapyrium chloride is a synthetic surfactant that helps cleanse and condition hair and skin, but it may cause mild irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Lauramide

Lauramide

3.5

Lauramide helps create rich lather and thicken cleansers, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Lauramide DEA

LAURAMIDE DEA

2.5

Lauramide DEA is an effective foam booster but has moderate irritation potential and environmental concerns, making it less popular in modern formulations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

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-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
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 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 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

Surfactant

Laureth-4

Laureth-4

3.5

Laureth-4 is an effective emulsifier and cleanser, but it can be moderately irritating and potentially pore-clogging for some skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-4 Phosphate

Laureth-4 Phosphate

3.5

Laureth-4 Phosphate is a synthetic emulsifier that helps mix oil and water, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-40

LAURETH-40

3.5

A mild cleansing and emulsifying agent, but can be drying or irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-5

LAURETH-5

3.5

Laureth-5 is a mild cleansing and emulsifying agent, but may be slightly drying or irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Laureth-5 Butyl Ether

LAURETH-5 BUTYL ETHER

3.5

Laureth-5 Butyl Ether is a synthetic emulsifier that helps mix oil and water in products, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Laureth-50

Laureth-50

3.8

A gentle, large-molecule surfactant that cleanses without stripping the skin, but may not be ideal for those avoiding ethoxylated ingredients.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review