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 20,303
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

Antioxidant

Erman's Birch Stem Extract

Betula Ermanii Stem Extract

4.0

A gentle, plant-based antioxidant that may help calm skin and defend against environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Preservative

Erucalkonium Chloride

Erucalkonium Chloride

3.5

Erucalkonium chloride is an effective preservative and antistatic agent for hair products, but it may cause mild irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

Slip Agent

Erucamide

ERUCAMIDE

3.5

Erucamide is a synthetic lubricant that improves the glide and feel of makeup and skincare, with a strong safety record at low use levels.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Surfactant

Erucamidopropyl Hydroxysultaine

Erucamidopropyl Hydroxysultaine

4.0

A gentle, effective surfactant that creates rich foam without stripping the skin, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Cleansing Agent

Erucic Acid

ERUCIC ACID

3.5

Erucic acid is a gentle fatty acid that helps cleanse and condition skin and hair, but it may be slightly comedogenic for acne-prone individuals.

Irritation

low

Source

natural

beautyskincarecleansing agent
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Emollient

Erucyl Arachidate

ERUCYL ARACHIDATE

4.0

Erucyl Arachidate is a gentle, non-greasy emollient that helps soften and smooth skin without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Erucyl Erucate

ERUCYL ERUCATE

4.0

A lightweight, plant-derived emollient that softens skin and improves product texture with a low risk of irritation or clogged pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Erucyl Oleate

Erucyl Oleate

4.0

Erucyl Oleate is a gentle emollient that softens and smooths skin without feeling greasy, making it a good choice for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Antioxidant

Erythorbic Acid

Erythorbic Acid

4.0

Erythorbic acid is a gentler, more stable alternative to L-ascorbic acid that helps brighten skin and fight free radicals.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Soothing Agent

Erythrina Variegata Flower Water

ERYTHRINA VARIEGATA FLOWER WATER

3.8

A mild, aromatic floral water that offers gentle soothing and antioxidant benefits, but with limited research specific to skincare.

Irritation

low

Source

natural

beautyskincaresoothing
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Soothing Agent

Erythrina Variegata Leaf Extract

Erythrina Variegata Leaf Extract

3.8

A gentle botanical extract with antioxidant and soothing potential, though research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Humectant

Erythritol

Erythritol

4.0

Erythritol is a gentle, non-irritating humectant that helps hydrate skin without stickiness, making it a great alternative to glycerin for sensitive or acne-prone skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Emollient

Erythrityl Triethylhexanoate

ERYTHRITYL TRIETHYLHEXANOATE

4.0

A lightweight synthetic emollient that softens skin without clogging pores, ideal for oily or combination skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Antioxidant

Erythrodiol

ERYTHRODIOL

4.0

Erythrodiol is a gentle plant antioxidant that may help calm skin and support its natural defenses, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Self-tanning agent

Erythrulose

Erythrulose

4.3

Erythrulose is a gentle sugar-derived self-tanner that works with DHA to create a more natural, longer-lasting tan with less odor and irritation.

Irritation

low

Source

natural

beautyskincareself-tanning
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Anti-inflammatory

Escin

ESCIN

4.0

Escin is a plant-derived anti-inflammatory ingredient that helps reduce puffiness and support microcirculation, especially around the eyes.

Irritation

low

Source

natural

beautyskincareanti-inflammatory
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Antioxidant

Esculetin

ESCULETIN

3.8

Esculetin is a plant-derived antioxidant that may help brighten skin and fight free radicals, but research in cosmetics is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Esculin

ESCULIN

3.8

Esculin is a gentle plant antioxidant that may help calm skin and protect against environmental stress, but it is not a star ingredient and is best used as part of a broader formula.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Viscosity Controlling

Esparto Wax

STIPA TENACISSIMA WAX

4.0

Esparto wax is a natural, plant-derived wax that helps thicken and stabilize cosmetic formulas without common irritation concerns.

Irritation

low

Source

natural

beautyskincarewax
Read ingredient review

Fragrance ingredient

Estratetraenol

Estratetraenol

2.5

Estratetraenol is a synthetic steroid with limited cosmetic research; its primary use is in fragrance or pheromone products, not proven for skincare benefits.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Film Former

Ethalkonium Chloride Acrylate Copolymer

ETHALKONIUM CHLORIDE ACRYLATE/HEMA/STYRENE COPOLYMER

3.5

A synthetic polymer that helps products form a flexible, long-lasting film on hair or skin, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Propellant

Ethane

ETHANE

2.5

Ethane is a safe, colorless gas used to propel product out of aerosol cans, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarepropellant
Read ingredient review

pH Adjuster

Ethanolamine

Ethanolamine

3.5

Ethanolamine is an effective pH adjuster but can be irritating for sensitive skin, especially in leave-on products.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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Humectant

Ethanolamine Glycerophosphate

ETHANOLAMINE GLYCEROPHOSPHATE

3.8

A gentle synthetic humectant that helps hydrate skin and support barrier function, but research on its long-term benefits is still limited.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Reducing Agent

Ethanolamine Thioglycolate

ETHANOLAMINE THIOGLYCOLATE

3.5

A strong chemical that breaks hair bonds for removal or reshaping, but can irritate skin if not used carefully.

Irritation

moderate

Source

synthetic

beautyskincarehair care
Read ingredient review

Humectant

Ethoxy Diglycol

3-ETHOXY-1,1-PROPANEDIOL

3.5

A gentle synthetic humectant that helps keep skin hydrated and improves product feel, but offers limited unique benefits compared to alternatives.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Fragrance Ingredient

Ethoxy Propenylphenol

ETHOXY-PROPENYLPHENOL

3.0

A synthetic fragrance ingredient with limited safety data; best for those who tolerate synthetic scents.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Ethoxy-p-cresol

ETHOXY-P-CRESOL

3.5

A synthetic antioxidant that helps prevent ingredient breakdown, but its safety data is less extensive than more common alternatives.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Solvent

Ethoxydiglycol

ETHOXYDIGLYCOL

3.8

Ethoxydiglycol is a common solvent that helps active ingredients penetrate the skin, but it can also increase the absorption of potentially irritating ingredients.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

Ethoxydiglycol Acetate

ETHOXYDIGLYCOL ACETATE

3.5

A mild synthetic solvent that helps dissolve other ingredients and gives a smooth, non-greasy feel, but may enhance penetration of other actives.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Film Former

Ethoxydiglycol Acrylate

ETHOXYDIGLYCOL ACRYLATE

3.5

A synthetic film-former that helps makeup and nail products last longer, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

Ethoxydiglycol Behenate

ETHOXYDIGLYCOL BEHENATE

4.2

A gentle synthetic emollient that helps skin feel soft and smooth without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Ethoxydiglycol Isostearate

ETHOXYDIGLYCOL ISOSTEARATE

4.0

A gentle, non-greasy emollient that helps soften skin and improve product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Ethoxydiglycol Oleate

ETHOXYDIGLYCOL OLEATE

3.8

A gentle emollient that helps soften skin and improve product texture, with a low risk of irritation or clogged pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Ethoxyheptyl Bicyclooctanone

ETHOXYHEPTYL BICYCLOOCTANONE

3.5

A synthetic fragrance ingredient that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Preservative

Ethoxymethoxymethylphenol

ETHOXY-METHOXYMETHYL-PHENOL

3.5

A synthetic preservative that helps keep products fresh, but its safety data is less extensive than more common alternatives.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Fragrance Ingredient

Ethyl 2-Acetylheptanoate

ETHYL 2-ACETYLHEPTANOATE

3.5

A synthetic fragrance ester that adds a fruity or floral note to products; generally safe at low levels but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl 2-Acetyloctanoate

ETHYL 2-ACETYLOCTANOATE

3.5

Ethyl 2-Acetyloctanoate is a synthetic fragrance ingredient with limited safety data; it is generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl 2-Methoxybenzyl Ether

ETHYL 2-METHOXYBENZYL ETHER

3.5

A synthetic fragrance ingredient with limited safety data; generally considered low-risk at typical use levels but best avoided by those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl 2-Methylbutyrate

ETHYL 2-METHYLBUTYRATE

4.0

A fruity-smelling ester used for scent; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Ethyl 2-Methylpent-3-Enoate

ETHYL 2-METHYLPENT-3-ENOATE

3.5

A synthetic fragrance ingredient that adds a fruity note to products; generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl 2-Methylpent-4-Enoate

ETHYL 2-METHYLPENT-4-ENOATE

3.5

A synthetic fragrance ester that adds a fruity note to products; generally considered safe at low concentrations but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Ethyl 2-Octenoate

ETHYL 2-OCTENOATE

3.5

Ethyl 2-Octenoate is a synthetic fragrance ingredient that adds a fruity, floral note to products; it is generally safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Ethyl 2,6-Dihydroxybenzoate

ETHYL 2,6-DIHYDROXYBENZOATE

3.5

A synthetic antioxidant that may help shield skin from oxidative damage, but research is still early and it's not a standout ingredient.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Solvent

Ethyl 3-Hydroxybutyrate

Ethyl 3-Hydroxybutyrate

3.5

A mild synthetic ester that helps dissolve other ingredients and adds a subtle scent, but offers no standout skincare benefits.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Fragrance Ingredient

Ethyl 3-Hydroxyhexanoate

Ethyl 3-Hydroxyhexanoate

3.5

A synthetic fragrance ester that adds a fruity scent to products; generally safe but may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl 3-Phenylglycidate

ETHYL 3-PHENYLGLYCIDATE

3.5

Ethyl 3-Phenylglycidate is a synthetic fragrance compound that adds a sweet, fruity note to products but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl Acetoacetate

Ethyl Acetoacetate

3.5

Ethyl Acetoacetate is a synthetic ester that adds scent and helps dissolve other ingredients, but it offers no direct skin benefit and may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl Acetoacetate Ethylene Glycol Ketal

ETHYL ACETOACETATE ETHYLENE GLYCOL KETAL

3.5

A synthetic fragrance ingredient that adds a fruity scent; generally safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Ethyl Acetoxyhexanoate

Ethyl Acetoxyhexanoate

3.5

A lightweight synthetic emollient that helps soften skin without a greasy feel, but it's not a star ingredient—just a supporting player in formulations.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Ethyl Almondate

Ethyl Almondate

4.0

A lightweight, non-greasy emollient derived from almond oil that hydrates and softens skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Exfoliant

Ethyl Aminolevulinate HCl

ETHYL AMINOLEVULINATE HCL

3.5

A synthetic ingredient that may support skin renewal when activated by light, but it's primarily used in medical settings and can be irritating.

Irritation

moderate

Source

synthetic

beautyskincareactive
Read ingredient review

Fragrance Ingredient

Ethyl Anisate

Ethyl Anisate

3.8

Ethyl Anisate is a gentle, naturally derived fragrance ingredient that adds a sweet, anise-like scent to products, but it offers no direct skincare benefits.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Ethyl Anthranilate

Ethyl Anthranilate

3.5

Ethyl Anthranilate is a synthetic fragrance ingredient that adds a floral, grape-like scent but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Ethyl Apricot Kernelate

ETHYL APRICOT KERNELATE

4.0

A lightweight, plant-based emollient that hydrates without greasiness, suitable for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review