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

Skin lightening agent

Alpha-Arbutin

Alpha-Arbutin

4.3

Alpha-arbutin is a well-tolerated, plant-based brightener that gently fades dark spots without the irritation of stronger alternatives.

Irritation

low

Source

natural

beautyskincarebrightening
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Antioxidant

Alpha-Camphorene

A-CAMPHORENE

3.5

Alpha-Camphorene is a plant-derived antioxidant with emerging research, but its use in skincare is limited and may pose a moderate irritation risk for sensitive skin.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Fragrance Component

Alpha-Cedrene

ALPHA-CEDRENE

3.5

Alpha-Cedrene is a natural fragrance ingredient from cedarwood with early research suggesting antioxidant and soothing benefits, but it's primarily used for scent.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance

Alpha-Damascone

ALPHA-DAMASCONE

3.5

Alpha-Damascone is a synthetic fragrance ingredient that adds a rose-like scent to products but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Alpha-Ethoxyphenetole

ALPHA-ETHOXYPHENETOLE

3.5

Alpha-Ethoxyphenetole is a synthetic fragrance ingredient with limited published safety data, but it is generally considered safe at the low levels used in cosmetics.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Humectant

Alpha-Glucan

Alpha-Glucan

4.0

Alpha-glucan is a gentle, sugar-derived humectant that hydrates skin and supports a healthy microbiome without irritation.

Irritation

low

Source

natural

beautyskincarehumectantprebiotic
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Fragrance

Alpha-Ionone

Alpha-Ionone

3.5

Alpha-Ionone adds a floral violet scent to products but can be a skin sensitizer for some individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Alpha-Ionyl Acetate

ALPHA-IONYL ACETATE

3.5

Alpha-Ionyl Acetate is a synthetic fragrance ingredient that adds a pleasant scent to products but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Alpha-Isomethyl Ionone

Alpha-Isomethyl Ionone

3.5

A common synthetic floral scent that is generally safe but may trigger allergies in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Alpha-Methyl Beta-Ionone

ALPHA-METHYL-BETA-IONONE

3.5

A synthetic scent ingredient that gives a floral violet note, but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Alpha-Methyldecanenitrile

ALPHA-METHYLDECANENITRILE

3.8

A synthetic scent ingredient that adds a fresh, citrusy note but offers no skincare benefit beyond fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Alpha-Phellandrene

ALPHA-PHELLANDRENE

3.5

Alpha-phellandrene is a fragrant plant compound with some antioxidant potential, but its main role in skincare is as a scent ingredient, and it may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Alpha-Pinanol

ALPHA-PINANOL

3.5

Alpha-Pinanol is a natural fragrance ingredient with mild antimicrobial properties, but it may cause irritation in sensitive skin at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Alpha-Pinene

PINENE

3.8

Alpha-pinene is a plant-derived antioxidant that can help protect skin from environmental stress, but it may cause irritation in sensitive individuals, especially at higher concentrations.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Fragrance

Alpha-Santalol

ALPHA-SANTALOL

4.0

Alpha-santalol is the primary fragrant component of sandalwood oil, offering a subtle woody scent and potential soothing benefits, but it must be used at low concentrations to minimize the risk of skin irritation.

Irritation

low

Source

natural

beautyskincarefragrancesoothing agent
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Emollient

Alpha-Santalyl Butyrate

Alpha-Santalyl Butyrate

3.8

Alpha-Santalyl Butyrate is a gentle synthetic emollient and fragrance ingredient that softens skin and adds a subtle sandalwood-like scent, but it has limited research on long-term benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
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Fragrance

Alpha-Terpinene

ALPHA-TERPINENE

3.5

Alpha-Terpinene is a fragrant plant compound with antioxidant benefits, but it can be irritating for sensitive skin and is best used in low concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Alpha-Terpinyl Acetate

TERPINYL ACETATE

3.5

Alpha-Terpinyl Acetate is a natural fragrance compound that adds a pleasant scent to products but may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Alpine Calamint Extract

ACINOS ALPINUS EXTRACT

3.5

A gentle plant extract with antioxidant potential, but research is limited and benefits are not well-established in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpine Clematis Callus Extract

Clematis Alpina Callus Extract

3.8

A gentle plant stem cell extract with antioxidant potential, but research on its specific benefits for skin is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpine Clematis Callus Powder

Clematis Alpina Callus Powder

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpine Eryngo Flower Extract

Eryngium Alpinum Flower Extract

3.8

A gentle botanical extract that may help calm skin and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpine Flax Extract

Linum Alpinum Flower/Leaf/Stem Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Alpine Holy Grass Extract

HIEROCHLOE ALPINA HERB EXTRACT

3.5

A gentle, fragrant plant extract with potential antioxidant and soothing benefits, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Fragrance

Alpine Holy Grass Oil

HIEROCHLOE ALPINA HERB OIL

3.5

Alpine Holy Grass Oil adds a natural, sweet scent to products and may offer mild soothing benefits, but research is limited.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Alpine Lady's Mantle Extract

ALCHEMILLA ALPINA EXTRACT

3.8

A gentle, antioxidant-rich plant extract that may help calm skin and defend against environmental stress, though research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpine Skullcap Extract

SCUTELLARIA ALPINA FLOWER/LEAF/STEM EXTRACT

4.0

A gentle botanical extract that helps protect skin from environmental stress and may calm irritation, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpine Snowbell Extract

Soldanella Alpina Extract

3.8

A gentle, antioxidant-rich alpine plant extract that may help soothe and protect skin from environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Calcarata Extract

Alpinia Calcarata Rhizome/Root Extract

3.8

A gentle botanical extract from the ginger family that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Fragrance

Alpinia Formosana Leaf Oil

ALPINIA FORMOSANA LEAF OIL

3.8

A fragrant leaf oil from the ginger family that adds a pleasant scent to products, but with limited research on skin benefits and potential for irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Alpinia Formosana Leaf/Stem Powder

ALPINIA FORMOSANA LEAF/STEM POWDER

3.5

A gentle botanical powder from the ginger family that may offer antioxidant and soothing benefits, but research is still early and its effects in skincare are not yet well-established.

Irritation

low

Source

natural

beautyskincarebotanical
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Soothing Agent

Alpinia Formosana Leaf/Stem Water

ALPINIA FORMOSANA LEAF/STEM WATER

3.8

A gentle, plant-derived water that may help calm skin and provide antioxidant benefits, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing
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Antioxidant

Alpinia Formosana Seed Powder

Alpinia Formosana Seed Powder

3.5

A gentle botanical seed powder with antioxidant potential, but research is limited and it's mostly used as a mild physical exfoliant.

Irritation

low

Source

natural

beautyskincarebotanical
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Humectant

Alpinia Formosana Seed Water

Alpinia Formosana Seed Water

3.8

A gentle, plant-derived water that offers light hydration and potential soothing benefits, but research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Soothing Agent

Alpinia Intermedia Leaf/Stem Water

Alpinia Intermedia Leaf/Stem Water

3.8

A mild, water-based botanical extract that may offer soothing and antioxidant benefits, but research on this specific species is limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Exfoliant

Alpinia Intermedia Seed Powder

Alpinia Intermedia Seed Powder

3.5

A gentle, natural powdered exfoliant with antioxidant potential, but research is limited and it may not suit very sensitive skin.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing Agent

Alpinia Intermedia Seed Water

Alpinia Intermedia Seed Water

3.8

A gentle, plant-derived water that may help calm skin and provide antioxidant protection, but research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Katsumadai Fruit Extract

ALPINIA KATSUMADAE FRUIT EXTRACT

4.0

A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Mutica Root Extract

Alpinia Mutica Root Extract

4.0

A gentle, antioxidant-rich root extract that may help calm skin and protect against environmental stressors, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Nigra Root Powder

Alpinia Nigra Root Powder

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Speciosa Extract

Alpinia Speciosa Root/Seed/Stem Extract

4.0

A gentle, plant-derived antioxidant that may help calm skin and defend against environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Speciosa Ferment

ALPINIA SPECIOSA LEAF/STEM FERMENT

4.0

A gentle, fermented botanical extract that may help calm skin and defend against environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Speciosa Leaf Extract

Alpinia Speciosa Leaf Extract

3.8

A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Fragrance

Alpinia Speciosa Leaf Oil

ALPINIA SPECIOSA LEAF OIL

3.8

A fragrant essential oil from shell ginger leaves that adds a pleasant scent to products, but may cause irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Soothing Agent

Alpinia Speciosa Leaf Water

Alpinia Speciosa Leaf Water

3.8

A mild, plant-derived water that may offer soothing and antioxidant benefits, but research is limited and it's often used more for its light scent and hydrating feel than proven efficacy.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Alpinia Uraiensis Leaf Extract

ALPINIA URAIENSIS LEAF EXTRACT

3.8

A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Fragrance

Alpinia Uraiensis Leaf Oil

Alpinia Uraiensis Leaf Oil

3.8

A fragrant plant oil with limited research; may offer mild skin benefits but poses a risk of irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Humectant

Alpinia Uraiensis Leaf Water

Alpinia Uraiensis Leaf Water

3.8

A gentle, hydrating botanical water that may offer antioxidant and soothing benefits, but research is limited.

Irritation

low

Source

natural

beautyskincarebotanical water
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Soothing Agent

Alpinia Uraiensis Stalk/Leaf Water

ALPINIA URAIENSIS STALK/LEAF WATER

3.8

A gentle, plant-derived hydrosol that may help calm skin and provide mild antioxidant benefits, but research is limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Fragrance

Alpinia Zerumbet Leaf Oil

ALPINIA ZERUMBET LEAF OIL

3.8

A fragrant leaf oil with mild antioxidant potential, best suited for those who enjoy botanical scents and have no sensitivity to essential oils.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Soothing Agent

Alpinia Zerumbet Leaf Water

ALPINIA ZERUMBET LEAF WATER

3.8

A gentle, water-based botanical extract that may offer mild soothing and antioxidant benefits, but research is limited.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Soothing Agent

Alpinia Zerumbet Leaf/Stem Water

ALPINIA ZERUMBET LEAF/STEM WATER

3.8

A gentle, water-like botanical ingredient that may help calm skin and provide antioxidant support, but research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Alpinia Zerumbet Seed Extract

ALPINIA ZERUMBET SEED EXTRACT

3.8

A gentle plant extract that may help protect skin from environmental stress and calm minor irritation, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Zerumbet Seed Powder

ALPINIA ZERUMBET SEED POWDER

3.8

A gentle plant-based powder that may help protect skin from environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Alpinia Zerumbet Seed Water

ALPINIA ZERUMBET SEED WATER

3.8

A gentle, antioxidant-rich water from shell ginger seeds that may help calm skin and fight free radicals, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review