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

Antioxidant

Diacetylcurcumin

Diacetylcurcumin

3.8

A stable, potent antioxidant derived from turmeric that may help brighten skin and fight free radicals, but human studies are limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antimicrobial

Diallyl Sulfide

DIALLYL SULPHIDE

3.5

Diallyl sulfide is a natural sulfur compound with antimicrobial potential, but its strong odor and limited skincare research make it a niche ingredient.

Irritation

moderate

Source

natural

beautyskincareantimicrobial
Read ingredient review

Hair growth promoter

Diaminopyrimidine Oxide

DIAMINOPYRIMIDINE OXIDE

3.8

A synthetic molecule that helps slow hair thinning by improving the anchoring of hair fibers in the scalp.

Irritation

low

Source

synthetic

beautyhaircareactive
Read ingredient review

Buffering Agent

Diammonium Citrate

DIAMMONIUM CITRATE

4.0

Diammonium Citrate is a safe, low-irritation pH adjuster that helps keep your skincare products stable and gentle on skin.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Reducing Agent

Diammonium Dithiodiglycolate

DIAMMONIUM DITHIODIGLYCOLATE

3.5

An effective but strong reducing agent for permanent hair restructuring; requires careful handling to avoid scalp irritation and hair damage.

Irritation

moderate

Source

synthetic

beautyhaircarereducing agent
Read ingredient review

Chelating Agent

Diammonium Ferric Pentetate

DIAMMONIUM FERRIC PENTETATE

3.5

A behind-the-scenes stabilizer that helps keep your products fresh and effective by neutralizing trace metals.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Surfactant

Diammonium Lauryl Sulfosuccinate

DIAMMONIUM LAURYL SULFOSUCCINATE

4.0

A gentle, sulfate-free surfactant that cleanses effectively with low irritation potential, ideal for sensitive or dry skin.

Irritation

low

Source

synthetic

beautyskincarecleanser
Read ingredient review

pH Adjuster

Diammonium Phosphate

DIAMMONIUM PHOSPHATE

3.5

Diammonium phosphate is a safe, low-irritation pH adjuster that helps keep your products stable and effective, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Antioxidant

Diamylhydroquinone

Diamylhydroquinone

3.5

Diamylhydroquinone is a synthetic antioxidant that helps keep oils and lip products from going rancid, but it's not a star active for skin benefits.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Exfoliant

Diatomaceous Earth

SOLUM DIATOMEAE

3.8

A natural, gritty powder that gently scrubs away dead skin and soaks up excess oil, but can be too harsh for sensitive or broken skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review

Preservative

Diazolidinyl Urea

DIAZOLIDINYL UREA

3.5

An effective preservative that can release formaldehyde, making it a potential irritant for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

Antistatic Agent

Dibehenoylethyl Dimonium Chloride

Dibehenoylethyl Dimonium Chloride

4.0

A mild, plant-derived conditioning ingredient that smooths hair without heavy buildup, suitable for fine or sensitive hair.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Emollient

Dibehenyl Fumarate

Dibehenyl Fumarate

4.0

A gentle, non-greasy emollient that helps products feel smooth and stay put without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

Dibehenyl Methylamine

Dibehenyl Methylamine

3.8

A gentle emulsifier and hair conditioner that helps create smooth, creamy textures in rinse-off and leave-on products.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Antistatic Agent

Dibehenyldimonium Chloride

Dibehenyldimonium Chloride

4.0

A gentle, effective conditioning ingredient that reduces static and improves manageability without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

UV Filter

Dibenzothiophene

DIBENZOTHIOPHENE

3.0

Dibenzothiophene is a synthetic UV filter with limited safety data; it is not widely used in mainstream skincare and may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareuv-filter
Read ingredient review

Solvent

Dibenzyl

DIBENZYL

3.0

Dibenzyl is a synthetic solvent and fragrance ingredient with moderate irritation potential; it is not a primary active but may appear in small amounts in scented products.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Fragrance Ingredient

Dibenzyl Ether

DIBENZYL ETHER

3.5

Dibenzyl Ether is a synthetic fragrance ingredient that adds a light floral note, but it offers no skincare benefits and may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Viscosity Controlling

Dibenzylidene Sorbitol

DIBENZYLIDENE SORBITOL

3.5

Dibenzylidene Sorbitol is a synthetic thickener that helps create smooth, non-greasy gels, but it has limited skin benefits and may feel heavy on some skin types.

Irritation

low

Source

synthetic

beautyskincareviscosity controlling
Read ingredient review

Preservative

Dibromohexamidine Isethionate

Dibromohexamidine Isethionate

3.5

An effective preservative but may cause irritation in sensitive individuals, especially at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

Solvent

Dibutoxymethane

Dibutoxymethane

3.5

Dibutoxymethane is a synthetic solvent that helps products spread and dry quickly, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Emollient

Dibutyl Adipate

DIBUTYL ADIPATE

4.0

Dibutyl Adipate is a lightweight synthetic emollient that helps products glide on smoothly without clogging pores or feeling heavy.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Film Former

Dibutyl Decyl IPDI

Dibutyl Decyl IPDI

3.5

A synthetic film-former that helps makeup and sunscreen stay put longer, especially in water or sweat.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

pH Adjuster

Dibutyl Ethanolamine

DIBUTYL ETHANOLAMINE

3.5

Dibutyl Ethanolamine is a synthetic pH adjuster that helps balance product acidity, but it may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Film Former

Dibutyl Fumarate Copolymer

DIBUTYL FUMARATE/HEXADECENE/TETRADECENE COPOLYMER

3.5

A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Gelling Agent

Dibutyl Lauroyl Glutamide

DIBUTYL LAUROYL GLUTAMIDE

4.0

A synthetic gelling agent that gives lip and stick products a smooth, clear, non-sticky texture without water.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Film Former

Dibutyl Maleate

DIBUTYL MALEATE

3.5

Dibutyl Maleate is a synthetic ingredient that helps products spread smoothly and resist water, but it has limited direct skin benefits and is best for those seeking long-wear or water-resistant formulas.

Irritation

low

Source

synthetic

beautyskincarefilm former
Read ingredient review

Film Former

Dibutyl Maleate Copolymer

Dibutyl Maleate/Hexadecene/Tetradecene Copolymer

4.0

A synthetic film-former that boosts water resistance and wear time in makeup and sunscreens, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Solvent

Dibutyl Oxalate

Dibutyl Oxalate

3.0

Dibutyl Oxalate is a synthetic solvent found mainly in nail products; it helps ingredients blend and dry, but there is limited safety data for leave-on skincare.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Emollient

Dibutyl Sebacate

Dibutyl Sebacate

3.5

Dibutyl Sebacate is a lightweight synthetic emollient that helps products spread smoothly and keeps nail polish flexible, but it has limited direct skin benefit.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Fragrance

Dibutyl Sulfide

Dibutyl Sulfide

3.0

Dibutyl Sulfide is a synthetic fragrance ingredient with a strong, unpleasant odor at high concentrations, used in tiny amounts to add complexity to scents.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dibutyldihydrofuranone

Dibutyldihydrofuranone

3.5

A synthetic scent ingredient that adds a sweet, creamy note to products; generally considered safe at low concentrations but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Humectant

Dibutylene Tetrafurfural

Dibutylene Tetrafurfural

3.5

A synthetic humectant that helps hydrate skin, but research on its long-term benefits is still emerging.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Film Former

Dibutylhexyl IPDI

Dibutylhexyl IPDI

3.5

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Plasticizer

Dibutyloctyl IPDI

DIBUTYLOCTYL IPDI

3.5

A synthetic ingredient that helps nail polish and lip products stay flexible and durable, but its safety profile is still being studied.

Irritation

low

Source

synthetic

beautyskincarenail care
Read ingredient review

Emollient

Dibutyloctyl Malate

Dibutyloctyl Malate

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dibutyloctyl Sebacate

Dibutyloctyl Sebacate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Anti-aging agent

Dicaffeoyl Lysyl Hexapeptide-65

Dicaffeoyl Lysyl Hexapeptide-65

3.8

A lab-made peptide with antioxidant-like modifications that may help firm skin, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Abrasive

Dicalcium Phosphate

Dicalcium Phosphate

4.0

Dicalcium phosphate is a gentle, non-irritating abrasive commonly used in toothpaste and some skincare powders to help polish and clean without harshness.

Irritation

low

Source

natural

beautyskincareoral care
Read ingredient review

Film Former

Dicaprolactone Ethoxyacrylate Copolymer

DICAPROLACTONE ETHOXYACRYLATE/1,4-BUTANEDIOL/IPDI COPOLYMER

3.8

A synthetic film-former that helps makeup last longer and resist water, but may feel tight or heavy on very sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Emollient

Dicapryl Adipate

Dicapryl Adipate

4.0

A silky, non-greasy emollient that helps skin feel soft and smooth, ideal for lightweight formulas.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dicapryl Succinate

Dicapryl Succinate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Hair conditioning agent

Dicapryloyl Cystine

Dicapryloyl Cystine

4.0

A gentle amino-acid derivative that helps strengthen hair and support skin firmness without irritation.

Irritation

low

Source

synthetic

beautyskincarehair care
Read ingredient review

Emollient

Dicaprylyl Carbonate

Dicaprylyl Carbonate

4.5

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

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Dicaprylyl Ether

Dicaprylyl Ether

4.3

A gentle, fast-absorbing emollient that softens skin without clogging pores or leaving a heavy residue.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review