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

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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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

Antioxidant

Dihydroxy Dimethyl Pyridine

2,6-DIHYDROXY-3,4-DIMETHYLPYRIDINE

3.5

A synthetic antioxidant that may help protect skin from environmental stress, but research is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Antioxidant

Dihydroxy Methylchromonyl Palmitate

Dihydroxy Methylchromonyl Palmitate

4.0

A synthetic antioxidant that helps shield skin from pollution and UV damage while supporting a brighter, more even complexion.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Colorant

Dihydroxyacetone

DIHYDROXYACETONE

4.0

DHA is the gold standard for sunless tanning, providing a natural-looking tan without UV exposure, but requires careful application to avoid streaks and uneven color.

Irritation

low

Source

synthetic

beautyskincarecolorant
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Self-tanning agent

Dihydroxyacetone (DHA)

Dihydroxyacetone

4.0

DHA is the most common active ingredient in sunless tanners, providing a temporary tan without UV exposure.

Irritation

low

Source

synthetic

beautyskincareself-tanner
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Skin brightening agent

Dihydroxybenzylidine Thiazolidinedione

Dihydroxybenzylidine Thiazolidinedione

3.5

A synthetic brightening compound with early evidence for reducing pigmentation, but limited long-term safety data.

Irritation

moderate

Source

synthetic

beautyskincarebrightening agent
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Antioxidant

Dihydroxydimethoxychalcone

Dihydroxydimethoxychalcone

4.0

A gentle antioxidant from the chalcone family that may help calm skin and defend against pollution and UV damage.

Irritation

low

Source

natural

beautyskincareantioxidant
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Surfactant

Dihydroxyethyl Cocoamine Oxide

DIHYDROXYETHYL COCAMINE OXIDE

4.0

A gentle, coconut-derived surfactant that helps create a rich lather while being less stripping than traditional sulfates.

Irritation

low

Source

natural

beautyskincaresurfactant
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Surfactant

Dihydroxyethyl Lauramine Oxide

Dihydroxyethyl Lauramine Oxide

4.0

A gentle, coconut-derived surfactant that boosts foam and cleanses without stripping the skin, making it a good choice for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Surfactant

Dihydroxyethyl Oleyl Glycinate

Dihydroxyethyl Oleyl Glycinate

4.0

A gentle, amino-acid-based surfactant that cleanses effectively 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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Emulsifier

Dihydroxyethyl Soyamine Dioleate

Dihydroxyethyl Soyamine Dioleate

3.8

A gentle emulsifier and conditioner from soybean oil that helps blend oils and water while softening hair and skin, but may be too heavy for oily or acne-prone types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Surfactant

Dihydroxyethyl Tallow Glycinate

Dihydroxyethyl Tallow Glycinate

3.5

A mild, tallow-derived surfactant that cleanses without stripping, but may raise concerns for those avoiding animal-derived ingredients.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Dihydroxyethyl Tallowamine HCl

Dihydroxyethyl Tallowamine HCl

3.0

An effective cleanser and antistatic agent from tallow, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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