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

Caragana Root Extract

Caragana Sinica Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Caragana Sinica Flower Extract

CARAGANA SINICA FLOWER EXTRACT

3.5

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Carambola Leaf Extract

Averrhoa Carambola Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Colorant

Caramel

CARAMEL

4.0

Caramel is a safe, natural colorant that adds a warm tint to products but offers no skincare benefits.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Emulsifier

Carapa Guaianensis Oil PEG-8 Esters

CARAPA GUAIANENSIS OIL PEG-8 ESTERS

4.0

A gentle, water-friendly emulsifier derived from andiroba oil that helps blend oils and water in cleansers and creams without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Carapa Procera Seed Oil

CARAPA PROCERA SEED OIL

4.0

A gentle, plant-based oil that hydrates and soothes without clogging pores, ideal for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Caraway Fruit Extract

CARUM CARVI FRUIT EXTRACT

3.8

Caraway Fruit Extract offers antioxidant and soothing benefits, but research on its efficacy in skincare is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Caraway Fruit Oil

Carum Carvi Fruit Oil

3.8

Caraway fruit oil offers antimicrobial benefits and a warm, herbal scent, but its strong essential oil nature means it can irritate sensitive skin if used undiluted.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Humectant

Carbocysteine

CARBOCYSTEINE

3.5

Carbocysteine is a gentle, hydrating amino acid derivative that may help support skin barrier health, but research in topical cosmetics is still limited.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Thickener

Carbomer

Carbomer

4.0

A safe, widely used thickener that gives gels and creams their smooth texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Absorbent

Carbon

CARBON

3.5

Carbon is a safe, non-irritating ingredient used mainly for its absorbent and coloring properties in skincare.

Irritation

low

Source

natural

beautyskincareabsorbent
Read ingredient review

Colorant

Carbon Black

CI 77267

3.5

Carbon Black is a common black pigment in cosmetics, generally safe for external use but may be irritating if inhaled or used near eyes in high amounts.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Propellant

Carbon Dioxide

Carbon Dioxide

3.5

Carbon dioxide is a safe, widely used propellant in aerosol cosmetics, but it offers no direct skin benefit.

Irritation

low

Source

natural

beautyskincarepropellant
Read ingredient review

Bulking Agent

Carbon Fiber

Carbon Fiber

2.5

Carbon fiber is a synthetic material used mainly for texture and bulk in cosmetics, with minimal direct skin benefit and very limited research on long-term safety in leave-on products.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Abrasive

Carbonado Extract

Carbonado Extract

3.5

Carbonado Extract is a natural diamond powder used for physical exfoliation, but its abrasiveness requires careful formulation to avoid skin damage.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review

Film Former

Carboxyethyl Acrylate

Carboxyethyl Acrylate

3.8

Carboxyethyl acrylate is a synthetic polymer that helps create a smooth, even film on skin, improving product texture and water resistance.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Antioxidant

Carboxyethyl Fluorene

PNA-9 CARBOXYETHYL FLUORENE

3.5

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

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Exfoliant

Carboxylesterase

CARBOXYLESTERASE

3.8

A gentle enzyme that helps loosen dead skin cells by breaking down surface bonds, offering mild exfoliation without harsh scrubbing.

Irritation

low

Source

biotech

beautyskincareenzyme
Read ingredient review

Film Former

Carboxymethyl Caprooyl Chitosan

CARBOXYMETHYL CAPROOYL CHITOSAN

4.0

A gentle, film-forming chitosan derivative that helps lock in moisture and may support skin barrier function.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
Read ingredient review

Humectant

Carboxymethyl Chitosan

Carboxymethyl Chitosan

4.0

A gentle, water-soluble chitosan derivative that hydrates and forms a protective film on skin, with some soothing and antioxidant potential.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantfilm-former
Read ingredient review

Film Former

Carboxymethyl Chitosan Myristamide

CARBOXYMETHYL CHITOSAN MYRISTAMIDE

4.0

A gentle, semi-synthetic ingredient that forms a breathable film on skin to lock in moisture and provide a smooth feel.

Irritation

low

Source

semi-synthetic

beautyskincarefilm former
Read ingredient review

Humectant

Carboxymethyl Chitosan Succinamide

CARBOXYMETHYL CHITOSAN SUCCINAMIDE

4.0

A gentle, water-loving derivative of chitosan that helps hydrate and form a protective film on the skin, with early research suggesting soothing benefits.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantfilm-former
Read ingredient review

Film Former

Carboxymethyl Levan

Carboxymethyl Levan

4.0

A gentle, biotech-derived film former that helps lock in moisture and may soothe the skin without clogging pores.

Irritation

low

Source

biotech

beautyskincarefilm-formerhumectant
Read ingredient review

Antioxidant

Cardamom Seed Extract

Elettaria Cardamomum Seed Extract

3.8

Cardamom Seed Extract offers antioxidant and soothing benefits, but research on its topical effects is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Cardamom Seed Oil

ELETTARIA CARDAMOMUM SEED OIL

3.8

Cardamom seed oil adds a warm, spicy scent and offers antioxidant benefits, but its essential oil nature means it can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Exfoliant

Cardamom Seed Powder

ELETTARIA CARDAMOMUM SEED POWDER

3.5

Cardamom seed powder offers gentle physical exfoliation and antioxidant benefits, but research on its cosmetic efficacy is limited.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Fragrance Ingredient

Carenyl Methyl Ketone

2-CARENYL METHYL KETONE

3.5

A synthetic fragrance compound that adds a fresh, woody scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Soothing Agent

Carex Humillis Root Extract

Carex Humillis Root Extract

3.8

A gentle plant-root extract with antioxidant and soothing potential, but research is limited and benefits are not yet well-established in clinical studies.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Antioxidant

Carex Meyeriana Extract

Carex meyeriana leaf/stem 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
Read ingredient review

Antioxidant

Carlina Acaulis Root Extract

CARLINA ACAULIS HAIRY ROOT CULTURE EXTRACT

3.8

A gentle, lab-grown root extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Soothing agent

Carlina Root Extract

CARLINA ACAULIS ROOT EXTRACT

4.0

Carlina Root Extract is a gentle botanical with antioxidant and soothing potential, but research is still early and it's not a powerhouse ingredient on its own.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Colorant

Carmine

CI 75470

3.5

Carmine gives a vibrant red or pink hue but may cause allergic reactions in sensitive individuals and is not vegan-friendly.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Antioxidant

Carnation Flower Extract

Dianthus Caryophyllus Flower Extract

3.8

A gentle botanical extract with antioxidant potential, but limited human studies to back dramatic claims.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Carnation Flower Oil

DIANTHUS CARYOPHYLLUS FLOWER OIL

3.5

Carnation Flower Oil adds a pleasant floral scent to products but has limited proven skincare benefits and may cause irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Carnation Flower Water

DIANTHUS CARYOPHYLLUS FLOWER WATER

3.8

A gentle, lightly astringent floral water that adds a pleasant scent and mild soothing feel to skincare, but lacks strong clinical backing.

Irritation

low

Source

natural

beautyskincarebotanical water
Read ingredient review

Antioxidant

Carnation Seed Extract

Dianthus Longicalyx Seed Extract

3.8

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

beautyskincareantioxidant
Read ingredient review

Thickener

Carnauba Acid Wax

Carnauba Acid Wax

4.0

Carnauba acid wax is a natural, plant-based wax that gives cosmetics a smooth texture and glossy shine, with a low risk of irritation.

Irritation

low

Source

natural

beautyskincarecosmetic
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Thickener

Carnauba Wax

Copernicia Cerifera Wax

4.0

Carnauba wax is a natural, plant-based thickener and shiner commonly found in lip products and creams, with a very low risk of irritation or clogged pores.

Irritation

low

Source

natural

beautyskincarethickener
Read ingredient review

Emollient

Carnauba Wax Extract

Copernicia Cerifera Wax Extract

4.0

A natural plant wax that gives products a smooth texture and glossy finish, generally safe and non-irritating for most skin types.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Carnitine

CARNITINE

4.0

Carnitine is a gentle antioxidant that may help protect skin from environmental stress and support a more youthful appearance.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Carnitine Isomerized Linoleate

CARNITINE ISOMERIZED LINOLEATE

3.8

A gentle, semi-synthetic ingredient that may help support the skin barrier and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Humectant

Carnitine PCA

CARNITINE PCA

4.0

A gentle, water-loving ingredient that pulls moisture into the skin and helps maintain a healthy barrier.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
Read ingredient review

Skin conditioning agent

Carnitine Tartrate

CARNITINE TARTRATE

4.0

Carnitine Tartrate is a gentle, multi-tasking ingredient that helps balance oil production, supports skin barrier health, and offers antioxidant protection.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Antioxidant

Carnosic Acid

CARNOSIC ACID

4.0

A powerful rosemary-derived antioxidant that helps defend skin from pollution and UV stress, but is less studied than vitamin C or E.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Carnosine

CARNOSINE

4.0

Carnosine is a gentle antioxidant that may help protect skin from aging and environmental stress, but more human studies are needed to confirm its benefits.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Carob Fruit Extract

Ceratonia Siliqua Fruit Extract

4.0

A gentle, antioxidant-rich extract from carob fruit that helps soothe and protect the skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Carob Seed Extract

Ceratonia Siliqua Seed Extract

4.0

Carob seed extract is a gentle, plant-based antioxidant that helps soothe and protect the skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Carotenoids

Carotenoids

4.0

Carotenoids are plant-derived antioxidants that help defend skin against environmental stress and may support a more even tone, but they are sensitive to light and air.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Carpopeltis Affinis Extract

CARPOPELTIS AFFINIS EXTRACT

4.0

A gentle red algae extract that helps hydrate and soothe the skin, with emerging research on its antioxidant potential.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Antimicrobial

Carpronium Chloride

CARPRONIUM CHLORIDE

3.5

Carpronium chloride is a synthetic ingredient that helps control microbes and condition skin or hair, but it may cause irritation for sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincareantimicrobial
Read ingredient review

Thickener

Carrageenan

Chondrus Crispus (Carrageenan) Extract

4.0

Carrageenan is a natural seaweed extract that helps thicken and soothe skincare products, but its film-forming effect may not suit everyone.

Irritation

low

Source

natural

beautyskincarethickener
Read ingredient review

Antioxidant

Carrot Callus Culture Extract

DAUCUS CAROTA SATIVA CALLUS CULTURE EXTRACT

4.0

A gentle, lab-grown carrot extract that may help protect skin from environmental stress and support a more even tone.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Antioxidant

Carrot Flower Extract

Daucus Carota Sativa Flower Extract

3.8

A gentle, antioxidant-rich flower extract that may help calm skin and fight free radicals, but research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review