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

Antioxidant

Walnut Seedcoat Extract

Juglans Regia Seedcoat Extract

3.8

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

Irritation

low

Source

natural

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Exfoliant

Walnut Shell Extract

Juglans Regia Shell Extract

3.5

A natural physical exfoliant that sloughs off dead skin cells, but can be too harsh for sensitive or acne-prone skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Abrasive

Walnut Shell Powder

JUGLANS REGIA (WALNUT) SHELL POWDER

3.5

Walnut shell powder is a natural physical exfoliant, but its irregular, sharp particles can cause micro-tears in the skin, making it a controversial choice for sensitive or acne-prone skin.

Irritation

moderate

Source

natural

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Antioxidant

Walnut Wood Extract

Juglans Regia Wood Extract

3.8

Walnut Wood Extract offers antioxidant and astringent benefits, but research on its specific effects in skincare is still limited.

Irritation

low

Source

natural

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Antioxidant

Walter's Dogwood Extract

Cornus Walteri Extract

3.8

A gentle botanical extract with antioxidant potential, but research is still early—think of it as a supportive ingredient rather than a star player.

Irritation

low

Source

natural

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Antioxidant

Walter's Dogwood Leaf Extract

CORNUS WALTERI LEAF EXTRACT

3.5

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

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Antioxidant

Waltheria Indica Leaf Extract

WALTHERIA INDICA LEAF EXTRACT

3.8

A gentle botanical extract with antioxidant and soothing potential, though research is still early and benefits are not yet proven in human studies.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Waratah Ferment Filtrate

LACTOBACILLUS/TELOPEA SPECIOSISSIMA FLOWER/LEAF FERMENT FILTRATE

4.0

A gentle, antioxidant-rich fermented botanical that may help protect skin from environmental stress while supporting a healthy microbiome.

Irritation

low

Source

biotech

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Antioxidant

Waratah Flower & Leaf Extract

Telopea Speciosissima Flower/Leaf Extract

3.8

A gentle, antioxidant-rich Australian botanical extract that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Wasabi & Brassica Sprout Extract

Wasabia Japonica Root/Brassica (Juncea/Oleracea Capitata/Oleracea Italica/Oleracea Botrytis/Oleracea Acephala) Sprout Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

Wasabi Root Extract

Wasabia Japonica Root Extract

3.8

Wasabi root extract offers antioxidant and antimicrobial benefits, but research on its topical effects is still emerging.

Irritation

low

Source

natural

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Antioxidant

Wasabi Root Ferment Extract

LACTOBACILLUS/WASABIA JAPONICA ROOT FERMENT EXTRACT

3.8

A fermented wasabi root extract that may offer antioxidant and soothing benefits, though research is still emerging.

Irritation

low

Source

biotech

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Antimicrobial

Wasabi Root Powder

Wasabia Japonica Root Powder

3.8

Wasabi root powder brings antimicrobial and anti-inflammatory benefits to skincare, but its potency means it's best used in low concentrations to avoid irritation.

Irritation

moderate

Source

natural

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Antioxidant

Wasabia Japonica Extract

Hydroxypropyltrimonium Wasabia Japonica Extract

3.8

A gentle, antioxidant-rich wasabi extract that may help soothe skin and fight environmental stress, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Wasabia Japonica Flower Extract

WASABIA JAPONICA FLOWER EXTRACT

4.0

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

Irritation

low

Source

natural

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Emollient

Watanabaea Reniformis Oil

Watanabaea Reniformis Oil

3.5

A gentle, plant-based oil that helps soften and smooth skin, though research on its specific benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

Water Avens Extract

GEUM RIVALE EXTRACT

3.8

A gentle botanical extract with antioxidant and soothing potential, but research is limited and benefits are not yet well-established.

Irritation

low

Source

natural

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Antioxidant

Water Chestnut Extract

TRAPA BICORNIS NUT EXTRACT

3.8

A gentle plant extract that may help calm skin and provide antioxidant support, though research is still limited.

Irritation

low

Source

natural

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Antioxidant

Water Chestnut Fruit Extract

TRAPA JAPONICA FRUIT EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Water Chestnut Peel Extract

Trapa Natans Peel Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Water Germander Extract

TEUCRIUM SCORODONIA EXTRACT

3.5

A gentle herbal extract with antioxidant potential, but research is limited and it's not a standout ingredient.

Irritation

low

Source

natural

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Soothing agent

Water Horsetail Extract

Equisetum fluviatile extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Water Lily Root Extract

NYMPHAEA ODORATA ROOT EXTRACT

3.8

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

Irritation

low

Source

natural

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Soothing Agent

Water Mint Extract

Mentha Aquatica Flower/Leaf/Stem Water

3.8

A mild, water-based mint extract that adds a refreshing feel and subtle scent to products, but with limited research on specific skincare benefits.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing agent

Water Mint Leaf Extract

Mentha Aquatica Leaf Extract

3.8

A gentle botanical extract that may help calm skin and provide antioxidant support, but research is limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Fragrance

Water Mint Leaf Oil

MENTHA AQUATICA LEAF OIL

3.8

Water mint leaf oil adds a fresh, herbal scent and mild skin-conditioning benefits, but can be irritating for sensitive skin due to its essential oil content.

Irritation

moderate

Source

natural

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Fragrance

Water Mint Oil

Mentha Aquatica Flower/Leaf/Stem Oil

3.8

Water mint oil adds a fresh scent and mild antimicrobial benefits, but can be irritating for sensitive skin at high concentrations.

Irritation

moderate

Source

natural

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Emollient

Water Spinach Oil

Ipomoea Aquatica Oil

3.8

Water Spinach Oil is a gentle, antioxidant-rich plant oil that hydrates and protects skin, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

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Humectant

Watermelon Fruit Juice

Citrullus Lanatus (Watermelon) Fruit Juice

3.8

Watermelon fruit juice is a gentle, hydrating ingredient that adds a light dose of antioxidants and a refreshing feel to skincare products.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Watermelon Seed Extract

Citrullus Lanatus Seed Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

Wayfaring Tree Bud Extract

VIBURNUM LANTANA BUD EXTRACT

3.5

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

Irritation

low

Source

natural

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Thickener

Welan Gum

Welan Gum

3.8

Welan gum is a gentle, plant-derived thickener that improves product texture and stability without clogging pores or irritating skin.

Irritation

low

Source

natural

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Antioxidant

Weld Extract

Reseda Luteola Flower/Leaf/Stem Extract

3.8

A gentle botanical extract with antioxidant potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

Welsh Onion Bulb Extract

ALLIUM FISTULOSUM BULB 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

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Antioxidant

Welsh Onion Root Extract

ALLIUM FISTULOSUM ROOT EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Wenyujin Turmeric Root Extract

Curcuma Wenyujin/Curcuma Kwangsiensis Rhizome Extract

4.0

A gentle, antioxidant-rich botanical extract from turmeric relatives that may help calm skin and fight free radicals.

Irritation

low

Source

natural

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Soothing agent

Western Dock Extract

Rumex Occidentalis Extract

3.8

A gentle botanical extract with antioxidant and soothing potential, but research is limited and benefits are not yet well-established.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Exfoliant

Western Hemlock Bark Powder

Tsuga heterophylla bark powder

3.5

A natural, gentle exfoliating powder from tree bark that may also provide antioxidant benefits, but research on its specific skincare effects is limited.

Irritation

low

Source

natural

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Fragrance

Western Red Cedar Stem Oil

Thuja Plicata Stem Oil

3.5

A fragrant tree oil with some antimicrobial potential, but limited research and a moderate risk of skin irritation mean it's best used in low concentrations and avoided by sensitive skin.

Irritation

moderate

Source

natural

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Fragrance

Western Red Cedar Wood Oil

Thuja Plicata Wood Oil

3.5

A fragrant wood oil with some antimicrobial potential, but limited research on skin benefits and a moderate risk of irritation for sensitive skin.

Irritation

moderate

Source

natural

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Emollient

Whale Oil

WHALE OIL

1.5

Whale oil is an outdated ingredient with ethical and sustainability issues; modern plant-based oils offer safer and more responsible alternatives.

Irritation

low

Source

natural

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Exfoliant

Wheat Bran

TRITICUM VULGARE BRAN

3.8

Wheat bran is a gentle, natural exfoliant that also helps absorb excess oil, but it may not suit those with gluten sensitivity or very dry skin.

Irritation

low

Source

natural

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Antioxidant

Wheat Bran Extract

Triticum Vulgare (Wheat) Bran Extract

4.0

A gentle, antioxidant-rich extract that helps protect skin from environmental stress while soothing irritation.

Irritation

low

Source

natural

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Surfactant

Wheat Bran Glycosides Blend

CAPRYLYL/CAPRYL WHEAT BRAN/STRAW GLYCOSIDES

4.0

A gentle, plant-derived surfactant that cleanses effectively while being kind to sensitive skin.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Wheat Bran Glycosides Surfactant

Lauryl/Myristyl Wheat Bran/Straw Glycosides

4.0

A mild, wheat-derived surfactant that cleanses without stripping the skin, ideal for sensitive or dry skin types.

Irritation

low

Source

natural

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Emollient

Wheat Bran Lipids

Triticum Vulgare (Wheat) Bran Lipids

4.0

A gentle, plant-derived lipid that helps replenish the skin barrier and lock in moisture without clogging pores.

Irritation

low

Source

natural

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Soothing Agent

Wheat Flour Extract

Triticum Vulgare Flour Extract

3.8

A gentle, plant-derived extract that helps calm skin and support the moisture barrier, but research on its benefits is still limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Wheat Flour Ferment Extract

PANTOEA AGGLOMERANS/WHEAT FLOUR FERMENT EXTRACT

4.0

A gentle, fermented ingredient that may help calm irritation and support the skin barrier, though research is still emerging.

Irritation

low

Source

biotech

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Emollient

Wheat Flour Lipids

Triticum Vulgare Flour Lipids

4.0

A gentle, plant-derived emollient that helps soften and smooth the skin without clogging pores.

Irritation

low

Source

natural

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Emollient

Wheat Germ

TRITICUM VULGARE GERM

4.0

Wheat germ is a natural emollient rich in vitamin E and fatty acids, great for dry skin but may be too heavy for oily or acne-prone types.

Irritation

low

Source

natural

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Conditioning agent

Wheat Germ & Oat Protein Complex

Wheat Germamidopropyldimonium Hydroxypropyl Hydrolyzed Oat Protein

4.0

A gentle conditioning protein that helps strengthen hair and lightly moisturize skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Emollient

Wheat Germ & Palm Oil Amino Esters

WHEAT GERM OIL/PALM OIL AMINOPROPANEDIOL ESTERS

3.8

A gentle emollient and emulsifier that helps soften skin and stabilize formulas, but its palm oil sourcing raises sustainability questions.

Irritation

low

Source

semi-synthetic

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Antioxidant

Wheat Germ Extract

TRITICUM VULGARE (WHEAT) GERM EXTRACT

4.0

Wheat Germ Extract is a gentle, antioxidant-rich ingredient that helps nourish and protect the skin, but those with gluten sensitivity should check product labels.

Irritation

low

Source

natural

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Emollient

Wheat Germ Glycerides

Wheat Germ Glycerides

4.0

A gentle, plant-derived emollient that helps replenish the skin barrier and lock in moisture without feeling greasy.

Irritation

low

Source

natural

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Emollient

Wheat Germ Oil

TRITICUM VULGARE GERM OIL

4.0

A nourishing, antioxidant-rich oil that deeply moisturizes but may clog pores for some skin types.

Irritation

low

Source

natural

beautyskincareemollient
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