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

Emulsifier

Diethylaminoethyl PEG-5 Cocoate

DIETHYLAMINOETHYL PEG-5 COCOATE

3.8

A mild, coconut-derived conditioning agent that helps products spread evenly and leaves hair feeling soft without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareemulsifier
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Emulsifier

Diethylaminoethyl PEG-5 Laurate

DIETHYLAMINOETHYL PEG-5 LAURATE

3.5

A gentle emulsifier that helps blend oil and water in skincare products, but its synthetic nature and limited research may give some pause.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Conditioning Agent

Diethylaminoethyl Stearate

DIETHYLAMINOETHYL STEARATE

3.5

A synthetic conditioning agent that can improve texture but may be irritating or clog pores for some skin types.

Irritation

moderate

Source

synthetic

beautyskincareconditioning agent
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Colorant

Diethylaminomethylcoumarin

DIETHYLAMINOMETHYLCOUMARIN

3.0

A synthetic fluorescent dye used for color in cosmetics; generally considered safe at low concentrations but may cause rare allergic reactions.

Irritation

low

Source

synthetic

beautyskincarecolorant
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Fragrance

Diethyldimethylcyclohexenone

DIETHYLDIMETHYLCYCLOHEXENONE

3.5

A synthetic scent ingredient that adds fragrance but offers no skincare benefits; generally safe at low levels but may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Solvent

Diethylene Glycol Dibenzoate

DIETHYLENE GLYCOL DIBENZOATE

3.5

A synthetic solvent and plasticizer that helps nail polishes and hair sprays apply smoothly and resist chipping, but it's not a hydrating or active skincare ingredient.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Emollient

Diethylene Glycol Diisononanoate

DIETHYLENE GLYCOL DIISONONANOATE

4.0

A lightweight synthetic emollient that gives a silky, non-greasy feel to products, with a low risk of irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Film Former

Diethylene Glycol Rosinate

DIETHYLENE GLYCOL ROSINATE

3.5

A pine-derived film former that helps makeup and sunscreens stay put, but may feel stiff or tacky on skin.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Skin conditioning agent

Diethylene Tricaseinamide

Diethylene Tricaseinamide

3.8

A synthetic ingredient that may help improve skin firmness and reduce fine lines, but research is still limited compared to more established peptides.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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pH Adjuster

Diethylenetriamine

DIETHYLENETRIAMINE

3.0

A synthetic pH adjuster that helps stabilize formulas but can be irritating at high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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Fragrance

Diethylheptadienal

DIETHYLHEPTADIENAL

3.5

Diethylheptadienal is a synthetic fragrance ingredient that adds a fresh scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Diethylhexyl Adipate

Diethylhexyl Adipate

3.8

A lightweight synthetic emollient that helps products glide on smoothly, but may clog pores for some skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

UV Filter

Diethylhexyl Butamido Triazone

Diethylhexyl Butamido Triazone

4.5

A highly effective, photostable sunscreen ingredient that provides broad-spectrum protection without the greasy feel of some older filters.

Irritation

low

Source

synthetic

beautyskincaresunscreen
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Emollient

Diethylhexyl Carbonate

DIETHYLHEXYL CARBONATE

4.0

A lightweight, non-greasy emollient that spreads easily and leaves a silky finish, ideal for oil-free formulations.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Diethylhexyl Cyclohexane

Diethylhexyl Cyclohexane

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Diethylhexyl Fumarate

Diethylhexyl Fumarate

4.0

A lightweight, non-greasy emollient that helps products glide on smoothly without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Film Former

Diethylhexyl IPDI

Diethylhexyl IPDI

3.5

A synthetic film-former that helps sunscreen and makeup stay put longer, but it's not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

Diethylhexyl Malate

Diethylhexyl Malate

4.2

A silky, non-greasy emollient that improves spreadability and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Diethylhexyl Maleate

Diethylhexyl Maleate

4.0

A lightweight, silky emollient that helps products spread smoothly without feeling heavy or greasy.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Diethylhexyl Naphthalate

DIETHYLHEXYL 2,6-NAPHTHALATE

3.8

A synthetic emollient that helps sunscreen formulas spread evenly and resist water, but it's less common and less studied than traditional alternatives.

Irritation

low

Source

synthetic

beautyskincaresunscreen
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Emollient

Diethylhexyl Sebacate

Diethylhexyl Sebacate

4.0

A well-tolerated, lightweight emollient that improves product feel and skin softness with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Surfactant

Diethylhexyl Sodium Sulfosuccinate

DIETHYLHEXYL SODIUM SULFOSUCCINATE

3.8

An effective synthetic cleanser that helps remove oil and dirt, but may be drying or irritating for sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Emollient

Diethylhexyl Succinate

DIETHYLHEXYL SUCCINATE

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Diethylhexyl Terephthalate

Diethylhexyl Terephthalate

3.8

A lightweight synthetic emollient that helps products glide on smoothly without greasiness, but it's not a hydrating or active ingredient.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Stabilizer

Diethyllutidinate

Diethyllutidinate

3.5

Diethyllutidinate is a synthetic stabilizer that may help other ingredients work better, but research on its direct skin benefits is still limited.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Fragrance

Diethylphenyl Methyl Ketone

2,4-DIETHYLPHENYL METHYL KETONE

3.5

A synthetic fragrance ingredient that adds scent but offers no skin benefit; safe at low levels but may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Diethylpyrazine

2,3-DIETHYLPYRAZINE

3.5

A synthetic fragrance compound that adds a nutty, roasted note to products; generally safe at low levels but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Diethylquinoline

DIETHYLQUINOLINE

2.5

Diethylquinoline is a synthetic fragrance compound with limited safety data; it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin Conditioning Agent

Difluorophenyl Propylcyclopentene Oxime

DIFLUOROPHENYL PROPYLCYCLOPENTENE OXIME

3.5

A synthetic ingredient with limited research; may offer antioxidant benefits but lacks strong evidence for efficacy or safety.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Emollient

Digalloyl Trioleate

DIGALLOYL TRIOLEATE

4.0

Digalloyl Trioleate is a gentle emollient with antioxidant potential, but research on its efficacy in skincare is still limited.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Soothing Agent

Digenea Simplex Extract

Digenea Simplex Extract

3.8

A gentle red algae extract that may help calm irritation and provide light hydration, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Diglucosyl Gallic Acid

Diglucosyl Gallic Acid

4.0

A gentle, stabilized antioxidant that helps brighten skin and protect against environmental damage without the irritation of pure gallic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Emollient

Diglycereth-7 Malate

DIGLYCERETH-7 MALATE

4.0

A lightweight, water-loving emollient that hydrates and softens skin without clogging pores or feeling heavy.

Irritation

low

Source

semi-synthetic

beautyskincareemollienthumectant
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Humectant

Diglycerin

DIGLYCERIN

4.3

Diglycerin is a gentle, effective humectant that hydrates skin without the sticky feel of glycerin, making it a great option for lightweight moisturizers.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emollient

Diglyceryl Sebacate/Isopalmitate

DIGLYCERYL SEBACATE/ISOPALMITATE

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

Diglyceryl Stearate Malate

DIGLYCERYL STEARATE MALATE

4.3

A mild, non-irritating emulsifier that helps create stable, creamy textures while also softening the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Skin conditioning agent

Diglycol Guanidine Succinate

DIGLYCOL GUANIDINE SUCCINATE

3.5

Diglycol Guanidine Succinate is a synthetic conditioning agent that helps improve the feel and mildness of skincare and haircare products, but research on its long-term effects is limited.

Irritation

low

Source

synthetic

beautyskincareconditioning agent
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Anti-aging

Diglycosyl Hexapeptide-2

Diglycosyl Hexapeptide-2

4.0

A sugar-modified peptide that may help firm skin and soften fine lines with low irritation potential.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Surfactant

Diheptyl Sodium Sulfosuccinate

DIHEPTYL SODIUM SULFOSUCCINATE

3.8

An effective synthetic cleanser that can be drying for some skin types, but generally safe and well-studied.

Irritation

moderate

Source

synthetic

beautyskincarecleansing agent
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Emollient

Diheptyl Succinate

Diheptyl Succinate

4.3

A silky, non-greasy emollient that hydrates and smooths skin while improving product texture.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

Diheptylundecyl Adipate

Diheptylundecyl Adipate

4.4

A silky, non-greasy emollient that hydrates and softens skin with a lightweight feel, suitable for most skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Dihexyl Adipate

Dihexyl Adipate

4.3

A silky, lightweight emollient that hydrates without clogging pores, ideal for oily and combination skin.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Dihexyl Fumarate

Dihexyl Fumarate

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Dihexyl Isoeicosanedioate

Dihexyl Isoeicosanedioate

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Surfactant

Dihexyl Sodium Sulfosuccinate

DIHEXYL SODIUM SULFOSUCCINATE

3.8

An effective cleansing agent that can be drying for some skin types, but generally safe when formulated properly.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review