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 4,092
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

Humectant

Hydrolyzed Olive Fruit

Hydrolyzed Olive Fruit

4.0

A gentle, water-soluble olive derivative that hydrates and helps protect skin from environmental stress without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Antioxidant

Hydrolyzed Olive Leaf Extract

Hydrolyzed Olive Leaf Extract

4.0

A gentle antioxidant extract from olive leaves that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Palo Verde Bark

Hydrolyzed Cercidium Floridum Bark

3.8

A gentle, plant-based antioxidant that may help calm skin and protect against environmental stress, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Passion Fruit Extract

Hydrolyzed Passiflora Alata Fruit

4.0

A gentle, antioxidant-rich fruit extract that helps hydrate and protect skin, though research on this specific form is still emerging.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Perilla Callus Extract

Hydrolyzed Perilla Ocymoides Callus Extract

4.0

A gentle, plant-derived antioxidant that may help calm skin and fight environmental stress, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Hydrolyzed Pine Leaf Extract

Hydrolyzed Pinus Densiflora Leaf Extract

4.0

A gentle, antioxidant-rich pine needle extract that may help calm skin and fight environmental stress, though human studies are limited.

Irritation

low

Source

natural

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Exfoliant

Hydrolyzed Pineapple Fruit

HYDROLYZED ANANAS SATIVUS FRUIT

4.0

A gentle, fruit-derived exfoliant that helps smooth skin texture without harsh scrubbing, thanks to natural enzymes and antioxidants.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Proanthocyanidin

Hydrolyzed Proanthocyanidin

4.0

A potent antioxidant that helps protect skin from free radicals and may support collagen health, but more human studies are needed to confirm anti-aging claims.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Prunus Domestica

Hydrolyzed Prunus Domestica

3.8

A gentle, antioxidant-rich plum extract that helps hydrate and condition the skin, but research on its specific benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Raspberry Fruit

Hydrolyzed Raspberry Fruit

4.0

A gentle, antioxidant-rich ingredient that helps protect skin from environmental stress while providing light hydration.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Rhubarb Root Extract

HYDROLYZED RHEUM OFFICINALE ROOT EXTRACT

3.8

A gentle, antioxidant-rich plant extract that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Rice Bran Extract

Hydrolyzed Rice Bran Extract

4.0

A gentle, antioxidant-rich extract that soothes and hydrates, ideal for sensitive or dry skin types.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Rice Ferment Filtrate

Lachancea/Hydrolyzed Rice Ferment Filtrate

4.0

A gentle, fermented rice ingredient that hydrates and supports skin barrier health without irritation.

Irritation

low

Source

biotech

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Antioxidant

Hydrolyzed Rice Leaf Extract

Hydrolyzed Rice Leaf Extract

4.0

A gentle, plant-based antioxidant that may help calm irritation and protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Rocket Leaf

HYDROLYZED ERUCA SATIVA LEAF

3.8

A gentle, antioxidant-rich plant extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Sesame Seed Extract

Hydrolyzed Sesame Seed Extract

4.0

A gentle, water-soluble extract from sesame seeds that helps hydrate and protect the skin with antioxidant benefits.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Antioxidant

Hydrolyzed Sichuan Pepper Extract

Hydrolyzed Zanthoxylum Piperitum Seed Extract

3.8

A gentle, antioxidant-rich plant extract that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Sophora Fruit Extract

Hydrolyzed Sophora Japonica Fruit Extract

4.0

A gentle, plant-derived antioxidant that helps calm skin and defend against environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Soybean Callus Extract

Hydrolyzed Soybean Callus Extract

3.8

A gentle, plant-based antioxidant that may help protect skin from environmental stress, but research on its specific benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Strawberry Fruit

Hydrolyzed Strawberry Fruit

4.0

A gentle, antioxidant-rich ingredient derived from strawberries that helps protect skin from environmental stress and provides light hydration.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Sweet Orange Fruit Extract

HYDROLYZED CITRUS AURANTIUM DULCIS FRUIT EXTRACT

4.0

A gentle antioxidant-rich extract from sweet oranges that helps protect skin from environmental stress and supports a more even tone.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Sycamore Extract

Hydrolyzed Platanus Occidentalis Extract

3.8

A gentle, plant-based antioxidant extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Tabebuia Leaf Extract

Hydrolyzed Tabebuia Impetiginosa Leaf Extract

3.8

A gentle, plant-derived antioxidant extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Tartary Buckwheat Extract

HYDROLYZED POLYGONUM TATARICUM BUD/SEED EXTRACT

4.0

A gentle, antioxidant-rich plant extract that may help calm skin and protect against environmental stress, though human studies are still limited.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Tomato Fruit Extract

Hydrolyzed Lycopersicon Esculentum Fruit Extract

4.0

A gentle antioxidant-rich extract that may help protect skin from environmental damage and support a more even tone.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Tomato Skin

Hydrolyzed Tomato Skin

4.0

A gentle, antioxidant-rich ingredient from tomato skins that helps protect skin from environmental stress while providing light hydration.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Water Lily Extract

HYDROLYZED NYMPHAEA TETRAGONA EXTRACT

4.0

A gentle, antioxidant-rich water lily extract that helps soothe and protect skin, but research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Wheat Bran Extract

Hydrolyzed Wheat Bran Extract

4.0

A gentle, plant-derived antioxidant that helps calm and protect the skin, especially suitable for sensitive or irritated skin types.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed White Mulberry Leaf Extract

Hydrolyzed Morus Alba Leaf Extract

4.0

A gentle, antioxidant-rich botanical extract that helps calm skin and defend against environmental stress, though research on its hydrolyzed form is still emerging.

Irritation

low

Source

natural

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Antioxidant

Hydroxy Methylphenylpyridinone

Hydroxy Methylphenylpyridinone

4.0

A synthetic antioxidant that helps stabilize formulas and protect skin from environmental stress, but research on direct skin benefits is still emerging.

Irritation

low

Source

synthetic

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Antioxidant

Hydroxyacetophenone

Hydroxyacetophenone

4.3

A gentle, multifunctional ingredient that helps protect your skin from environmental stress and allows brands to use fewer harsh preservatives.

Irritation

low

Source

synthetic

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Fragrance

Hydroxybenzaldehyde

Hydroxybenzaldehyde

3.5

Hydroxybenzaldehyde is a natural aromatic compound used for scent and mild antioxidant benefits, but it can be a skin sensitizer for some people.

Irritation

moderate

Source

natural

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Antioxidant

Hydroxybenzomorpholine

Hydroxybenzomorpholine

3.5

A synthetic antioxidant that may help defend skin against pollution and UV damage, but research is still early.

Irritation

low

Source

synthetic

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Antioxidant

Hydroxycinnamic Acid

Hydroxycinnamic Acid

3.8

A gentle plant-derived antioxidant that helps shield skin from pollution and UV damage, but is less studied than vitamin C or E.

Irritation

low

Source

natural

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Skin conditioning

Hydroxycitryl Palmitate

Hydroxycitryl Palmitate

3.8

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

Irritation

low

Source

synthetic

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Antioxidant

Hydroxydaidzein

Hydroxydaidzein

3.8

A gentle antioxidant from soy that may help calm skin and support a more even tone, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Hydroxydecyl Ubiquinone Linoleate

HYDROXYDECYL UBIQUINONE LINOLEATE

4.0

A gentle, oil-friendly form of CoQ10 that helps protect skin from environmental stress and supports a more youthful appearance.

Irritation

low

Source

semi-synthetic

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Antioxidant

Hydroxygenistein

Hydroxygenistein

4.0

A gentle antioxidant derived from soy isoflavones that helps defend skin against pollution and UV damage while supporting a more even complexion.

Irritation

low

Source

natural

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Antioxidant

Hydroxyphenyl Dihydroxybenzamide

Hydroxyphenyl Dihydroxybenzamide

4.0

A synthetic antioxidant that may help brighten skin and fight signs of aging, with early research suggesting it is gentle and effective.

Irritation

low

Source

synthetic

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Antioxidant

Hydroxyphenyl Dimethoxyisoindolinone

Hydroxyphenyl Dimethoxyisoindolinone

4.0

A synthetic antioxidant that helps defend skin from pollution and UV-related damage, with early research suggesting it may also help brighten skin.

Irritation

low

Source

synthetic

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Antioxidant

Hydroxypropyltrimonium Ascorbate

Hydroxypropyltrimonium Ascorbate

4.3

A gentle, stable vitamin C derivative that brightens skin and fights free radicals without the sting of pure ascorbic acid.

Irritation

low

Source

semi-synthetic

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Antioxidant

Hydroxyresveratrol

Hydroxyresveratrol

4.0

A powerful antioxidant that may help brighten skin and fight signs of aging, but more human studies are needed.

Irritation

low

Source

natural

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Antioxidant

Hydroxytryptophan

Hydroxytryptophan

3.0

Hydroxytryptophan is a little-known skincare ingredient with theoretical antioxidant benefits, but there is very limited research on its effectiveness when applied to the skin.

Irritation

low

Source

natural

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Antioxidant

Hydroxytyrosol

Hydroxytyrosol

4.3

A powerful olive-derived antioxidant that helps shield skin from pollution and UV stress, with emerging research supporting its anti-aging potential.

Irritation

low

Source

natural

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