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

Film Former

Isostearoyl Epoxy Resin

ISOSTEAROYL EPOXY RESIN

3.5

A synthetic resin that helps makeup stay put, but offers no skincare benefit and may feel heavy on sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Skin conditioner

Isostearoyl Hydrolyzed Collagen

ISOSTEAROYL HYDROLYZED COLLAGEN

4.0

A gentle conditioning ingredient that helps skin and hair feel smooth and soft without being heavy.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioning Agent

Isostearoyl Hydrolyzed Silk

ISOSTEAROYL HYDROLYZED SILK

4.0

A gentle, modified silk protein that adds softness and shine to hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Soothing Agent

Isostearoyloxy Cyclohexylbutyramide

ISOSTEAROYLOXY CYCLOHEXYLBUTYRAMIDE

4.0

A synthetic soothing ingredient that mimics natural skin-signaling peptides to help reduce visible redness and discomfort.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
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Emollient

Isostearyl Acetate

ISOSTEARYL ACETATE

3.8

Isostearyl Acetate is a lightweight emollient that helps skin feel soft and smooth, but it may clog pores in acne-prone individuals.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Isostearyl Alcohol

ISOSTEARYL ALCOHOL

4.0

A gentle fatty alcohol that softens skin and improves product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Avocadate

Isostearyl Avocadate

4.0

A gentle, plant-derived emollient that softens skin and helps restore the moisture barrier without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

Isostearyl Behenate

Isostearyl Behenate

4.0

A gentle, non-greasy emollient that softens skin and improves product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Benzoate

Isostearyl Benzoate

4.0

Isostearyl Benzoate is a lightweight, non-greasy emollient that helps soften skin and improve product texture, with a low risk of irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

Isostearyl Diglyceryl Succinate

Isostearyl Diglyceryl Succinate

4.3

A mild, effective emulsifier that creates stable, silky formulas without stripping the skin — ideal for sensitive and dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Isostearyl Erucate

Isostearyl Erucate

3.8

Isostearyl Erucate is a gentle, non-greasy emollient that helps soften skin and improve product texture, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Antioxidant

Isostearyl Ferulate

Isostearyl Ferulate

4.1

A gentle, oil-soluble antioxidant that helps protect skin from environmental stress and supports a more even-looking complexion.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Emulsifier

Isostearyl Glucoside

Isostearyl Glucoside

4.5

A mild, sugar-based emulsifier that helps create stable, creamy textures without irritating the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Isostearyl Glyceryl Ether

ISOSTEARYL GLYCERYL ETHER

4.0

A gentle synthetic emollient that hydrates and smooths skin without clogging pores, suitable for most skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Isostearyl Glycolate

Isostearyl Glycolate

4.0

A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Hydroxystearate

Isostearyl Hydroxystearate

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Isobutyrate

Isostearyl Isobutyrate

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Isostearyl Isononanoate

ISOSTEARYL ISONONANOATE

4.0

A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Isostearyl Isostearate

Isostearyl Isostearate

4.0

A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Lactate

Isostearyl Lactate

4.0

A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Laurate

Isostearyl Laurate

4.0

A lightweight, non-greasy emollient that softens skin without clogging pores, making it a good choice for oily or combination skin.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Antistatic Agent

Isostearyl Laurdimonium Chloride

Isostearyl Laurdimonium Chloride

3.5

A synthetic conditioning ingredient that reduces static and softens hair, but may cause irritation for sensitive scalps.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emollient

Isostearyl Linoleate

ISOSTEARYL LINOLEATE

4.0

A lightweight, non-greasy emollient that helps soften skin and improve product texture.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Myristate

Isostearyl Myristate

3.8

A reliable emollient that makes skin feel soft, but may clog pores for those prone to breakouts.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Neopentanoate

Isostearyl Neopentanoate

4.0

A lightweight synthetic emollient that gives skin a smooth, silky finish without clogging pores, making it a popular choice in non-greasy formulas.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Palmitate

Isostearyl Palmitate

4.0

A lightweight synthetic emollient that softens skin without heavy greasiness, but may clog pores for some people.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl PCA

Isostearyl PCA

4.0

A gentle, non-greasy emollient that helps soften and smooth skin while supporting the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isostearyl Sebacate

Isostearyl Sebacate

4.0

A gentle, non-greasy emollient that improves product texture and leaves skin feeling soft without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isotridecyl Acetate

Isotridecyl Acetate

3.8

A lightweight synthetic emollient that helps products spread smoothly without a greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isotridecyl Alcohol

Isotridecyl Alcohol

3.5

A gentle synthetic alcohol that softens skin and helps dissolve other ingredients, but offers no active benefits on its own.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Isotridecyl Laurate

Isotridecyl Laurate

4.0

A lightweight, non-greasy emollient that helps products glide on smoothly and leaves skin feeling soft without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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
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Emollient

Isotridecyl Salicylate

Isotridecyl Salicylate

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

Fragrance

Isovaleric Acid

ISOVALERIC ACID

3.5

Isovaleric acid is mainly used for its scent and to adjust product pH, but it can be irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Antioxidant

Italian Cypress Extract

Cupressus Sempervirens Leaf/Stem Extract

3.8

Italian Cypress Extract offers antioxidant and astringent benefits, making it a gentle option for oily or combination skin, but research on its topical efficacy is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antifungal Agent

Itraconazole

Itraconazole

3.5

Itraconazole is a prescription-strength antifungal that can treat stubborn fungal skin infections, but it is not a routine cosmetic ingredient and should only be used under medical guidance.

Irritation

moderate

Source

synthetic

beautyskincareantifungal
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Exfoliant

Ivory Nut Powder

PHYTELEPHAS AEQUATORIALIS SEED POWDER

4.0

A gentle, biodegradable natural exfoliant that polishes skin without microplastics, but may feel too coarse for very sensitive skin.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing Agent

Ivy Geranium Extract

Pelargonium Peltatum Extract

3.8

A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Ivy Gourd Seed Extract

Ipomoea hederacea seed extract

3.8

A gentle antioxidant extract from ivy gourd seeds that may help protect skin from environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Ivy Leaf Callus Extract

Ipomoea hederacea callus culture extract

3.8

A lab-grown plant cell extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Soothing Agent

Ivy Leaf Water

Hedera Helix (Ivy) Leaf Water

3.8

A mild botanical water that may help calm skin and tighten pores, but research is limited and it's not a powerhouse ingredient.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Soothing agent

Ivy Leaf/Stem Extract

HEDERA HELIX LEAF/STEM EXTRACT

3.8

A botanical extract with traditional use for soothing and firming, but limited modern research and a moderate risk of skin irritation for sensitive types.

Irritation

moderate

Source

natural

beautyskincarebotanical extract
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