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

Emollient

Dihexyldecyl IPDI

Dihexyldecyl Isophthalate

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
Read ingredient review

Emollient

Dihexyldecyl Lauroyl Glutamate

Dihexyldecyl Lauroyl Glutamate

4.5

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

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dihexyldecyl Sebacate

DIHEXYLDECYL SEBACATE

4.3

A silky, non-greasy emollient that spreads easily and helps other ingredients absorb better — great for all skin types, including oily and acne-prone.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dihexylexane

DIHEXYLOXY CYCLOHEXANE

4.0

A lightweight synthetic emollient that improves product feel and helps other ingredients absorb without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Fragrance

Dihydro Pentamethylindanone

Dihydro Pentamethylindanone

3.5

A synthetic scent ingredient that adds a pleasant floral-musky note, but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dihydro-4-Methyl-5-Pentylfuranone

DIHYDRO-4-METHYL-5-PENTYLFURANONE

3.5

A synthetic fragrance ingredient that adds a sweet, creamy scent but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dihydro-Alpha-Methyl Alpha-Ionone

DIHYDRO-ALPHA-METHYL ALPHA-IONONE

3.5

A synthetic scent ingredient that adds a pleasant floral-woody note but offers no skincare benefit and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Dihydro-Alpha-Terpineol

Dihydro-Alpha-Terpineol

3.5

A synthetic pine-scented fragrance ingredient that adds a fresh note but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Dihydroabietyl Behenate

Dihydroabietyl Behenate

4.0

A gentle, plant-derived emollient that improves the feel and spreadability of products without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Film Former

Dihydroabietyl Methacrylate

DIHYDROABIETYL METHACRYLATE

3.8

A resin-derived film former that helps makeup and sunscreen stay put longer, but may feel stiff or heavy on some skin types.

Irritation

low

Source

semi-synthetic

beautyskincarefilm former
Read ingredient review

Fragrance Ingredient

Dihydroanethole

DIHYDROANETHOLE

3.5

Dihydroanethole is a synthetic scent ingredient that adds a sweet, licorice-like note but offers no skin benefit and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Soothing Agent

Dihydroazulene Isomer

DIDEHYDRO-OCTAHYDRO-7-ISOPROPYL-1,4-DIMETHYLAZULENE

3.8

A synthetic relative of chamomile-derived azulene, this ingredient is used to calm redness and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Fragrance

Dihydrocarveol

DIHYDROCARVEOL

3.5

Dihydrocarveol adds a minty, herbal scent to products but may cause irritation in sensitive individuals at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Dihydrocarvone

DIHYDROCARVONE

3.5

Dihydrocarvone is a natural fragrance compound that adds a minty scent to products but offers no direct skincare benefits.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Emollient

Dihydrocholesterol

DIHYDROCHOLESTEROL

4.3

A gentle, skin-friendly lipid that reinforces the moisture barrier without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Skin Conditioning Agent

Dihydrocholesteryl Butyrate

Dihydrocholesteryl Butyrate

4.0

A gentle, cholesterol-based emollient that helps reinforce the skin barrier and lock in moisture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dihydrocholesteryl Isostearate

DIHYDROCHOLESTERYL ISOSTEARATE

4.0

A gentle, cholesterol-based emollient that helps reinforce the skin barrier without clogging pores, making it a good choice for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dihydrocholesteryl Macadamiate

Dihydrocholesteryl Macadamiate

4.0

A gentle, non-greasy emollient that mimics skin's natural lipids, making it a good choice for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dihydrocholesteryl Nonanoate

Dihydrocholesteryl Nonanoate

4.2

A gentle, cholesterol-based emollient that supports the skin barrier and helps lock in moisture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dihydrocholesteryl Oleate

DIHYDROCHOLESTERYL OLEATE

4.0

A gentle, cholesterol-based emollient that helps restore the skin barrier and improve moisture retention without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

Dihydrocholeth-15

Dihydrocholeth-15

3.5

A gentle emulsifier that helps blend oil and water in formulas, with mild skin-conditioning benefits.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

Dihydrocholeth-20

DIHYDROCHOLETH-20

4.0

A gentle, cholesterol-derived ingredient that helps soften skin and improve product feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

Dihydrocholeth-30

Dihydrocholeth-30

4.0

A gentle emulsifier that helps blend water and oil in formulas, with a structure similar to skin-friendly cholesterol.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Fragrance Ingredient

Dihydrocitronellyl Acetate

DIHYDROCITRONELLYL ACETATE

3.5

A synthetic scent ingredient that makes products smell pleasant but offers no skincare benefit and may trigger sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Dihydrocitronellyl Butyrate

DIHYDROCITRONELLYL BUTYRATE

3.8

A synthetic fragrance ester that adds a pleasant scent but offers no skincare benefits; safe at low concentrations for most people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dihydrocitronellyl Ethyl Ether

DIHYDROCITRONELLYLETHYL ETHER

3.8

A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Dihydroeugenol

Dihydroeugenol

4.0

Dihydroeugenol is a gentle antioxidant that helps protect skin from environmental stress while offering mild conditioning benefits.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Dihydrofarnesol

Dihydrofarnesol

4.0

Dihydrofarnesol is a gentle, naturally derived fragrance ingredient that also offers mild skin-conditioning benefits, making it a safer alternative to synthetic perfumes.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Surfactant

Dihydrogenated Tallow Methylamine

Dihydrogenated Tallow Methylamine

3.5

An effective conditioning agent for dry or damaged hair, but may be too heavy for fine hair or oily skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircaresurfactant
Read ingredient review

Film Former

Dihydrogenated Tallow Phthalic Acid Amide

DIHYDROGENATED TALLOW PHTHALIC ACID AMIDE

3.0

A synthetic film-forming ingredient that helps products spread smoothly and hold their shape, but its safety data is limited and it may not suit sensitive or acne-prone skin.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Fragrance Ingredient

Dihydrogeranial Diphenethyl Acetal

Dihydrogeranial Diphenethyl Acetal

3.5

A synthetic fragrance ingredient that adds a long-lasting scent 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

Dihydrogeranyl Isovalerate

DIHYDROGERANYL ISOVALERATE

3.5

A synthetic scent ingredient that adds a pleasant aroma but offers no skincare benefits; safe at low levels but may cause sensitivity in some.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dihydrogeranyl Tiglate

Dihydrogeranyl Tiglate

4.0

Dihydrogeranyl Tiglate is a synthetic fragrance ingredient that adds a pleasant scent to products; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Dihydrogeranylacetone

Dihydrogeranylacetone

3.5

A synthetic fragrance ingredient that adds a fresh, green scent; generally safe at low levels but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Dihydrogeranylidene-Bis-Indole

Dihydrogeranylidene-Bis-Indole

3.5

A synthetic compound with early research suggesting antioxidant and soothing benefits, but more studies are needed to confirm its efficacy in skincare.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance

Dihydrojasmone

Dihydrojasmone

3.8

Dihydrojasmone is a synthetic jasmine-like fragrance that adds a pleasant scent to products but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Dihydrolanosterol

Dihydrolanosterol

4.0

A gentle, lanolin-derived emollient that helps maintain skin softness without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Dihydrolinalool

1,2-DIHYDROLINALOOL

3.5

A synthetic scent ingredient that adds a pleasant floral note but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Dihydromyrcene

Dihydromyrcene

3.8

Dihydromyrcene is a synthetic scent ingredient that adds a fresh, citrus-like aroma but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dihydromyrcenyl Acetate

DIHYDROMYRCENYL ACETATE

3.5

A common synthetic fragrance that adds a pleasant scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Dihydromyricetin

Dihydromyricetin

4.0

A plant-derived antioxidant that helps calm skin and defend against environmental stress, with emerging research for anti-aging benefits.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Dihydrophytosteryl Octyldecanoate

Dihydrophytosteryl Octyldecanoate

4.0

A gentle, plant-derived emollient that helps soften and smooth skin without clogging pores, making it suitable for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Dihydropseudoionone

DIHYDROPSEUDOIONONE

3.5

Dihydropseudoionone is a synthetic scent ingredient that adds a pleasant floral note, but it offers no skincare benefits and may cause sensitivity in those allergic to fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Dihydroquercetin

Dihydroquercetin

4.3

A powerful plant-based antioxidant that helps defend skin against pollution and UV damage, with a good safety profile.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Dihydroquercetin Dithiolanepentyl Ether

DIHYDROQUERCETIN DITHIOLANEPENTYL ETHER

3.8

A novel antioxidant that combines two well-known skin protectors, but research is still early and it may not be widely available in consumer products yet.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Dihydroquercetin Pentacaprylate

DIHYDROQUERCETIN PENTACAPRYLATE

4.0

A potent, oil-soluble antioxidant that may help protect skin from environmental damage and support a more even tone.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Dihydroquercetin Tetracaprylate

DIHYDROQUERCETIN TETRACAPRYLATE

4.0

A potent, oil-friendly antioxidant that helps defend skin against pollution and UV damage without the stability issues of pure dihydroquercetin.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Dihydroterpinyl Acetate

DIHYDROTERPINYL ACETATE

3.5

Dihydroterpinyl Acetate is a synthetic scent ingredient that gives a fresh, woodsy aroma but may cause irritation in sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review