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

Emulsifier

C40-60 Pareth-10

C40-60 Pareth-10

3.5

A gentle synthetic emulsifier that helps mix water and oil, but offers no direct skin benefit on its own.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

C40-60 Pareth-3

C40-60 Pareth-3

3.5

A gentle synthetic emulsifier that helps mix water and oil in your skincare products, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Film Former

C5-6 Olefin/Styrene Copolymer

C5-6 OLEFIN/STYRENE COPOLYMER

3.5

A safe, synthetic film-former that helps makeup last longer and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Surfactant

C6-10 Pareth-4 Phosphate

C6-10 PARETH-4 PHOSPHATE

3.8

A gentle synthetic surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

C6-12 Perfluoroalkylethanol

C6-12 Perfluoroalkylethanol

3.0

A synthetic fluorinated surfactant that helps products spread and clean, but its environmental persistence raises concerns.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

C6-14 Polyolefin

POLY(C6-14 OLEFIN)

4.0

A safe, non-greasy synthetic oil that helps products glide on smoothly without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Solvent

C7-8 Isoparaffin

C7-8 Isoparaffin

3.8

A lightweight, volatile solvent that helps products spread smoothly and evaporate quickly, leaving a non-greasy finish.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Emollient

C8-12 Acid Triglyceride

C8-12 Acid Triglyceride

4.3

A gentle, non-greasy emollient that hydrates and smooths skin, ideal for sensitive and oily skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Solvent

C8-9 Alkane/Cycloalkane

C8-9 Alkane/Cycloalkane

4.0

A lightweight, volatile hydrocarbon that helps products spread easily and evaporate quickly without leaving a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-10 Alkane/Cycloalkane

C9-10 ALKANE/CYCLOALKANE

4.0

A lightweight, volatile hydrocarbon that helps dissolve makeup and sebum without leaving a greasy residue.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Solvent

C9-11 Alkane/Cycloalkane

C9-11 ALKANE/CYCLOALKANE

4.0

A lightweight, non-greasy solvent that helps dissolve makeup and sunscreen while leaving a silky feel on skin.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Surfactant

C9-11 Alkyl Glucoside

C9-11 Alkyl Glucoside

4.5

A gentle, plant-based surfactant that cleanses without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Emollient

C9-11 Isoparaffin

C9-11 Isoparaffin

3.8

A lightweight, non-greasy emollient that helps products spread smoothly and evaporates quickly, leaving a silky feel.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Surfactant

C9-11 Pareth-3

C9-11 PARETH-3

3.8

A gentle synthetic surfactant that helps cleanse without stripping, but may not suit ultra-sensitive skin in high concentrations.

Irritation

low

Source

synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

C9-11 Pareth-4

C9-11 Pareth-4

3.8

C9-11 Pareth-4 is a mild synthetic emulsifier that helps cleansers remove dirt and oil, but may be slightly drying for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

C9-11 Pareth-40

C9-11 PARETH-40

3.8

A synthetic cleansing agent that helps remove dirt and oil, but may be drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

C9-11 Pareth-6

C9-11 PARETH-6

3.8

A gentle synthetic surfactant that helps cleansers foam and rinse cleanly, but may cause mild irritation for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

C9-11 Pareth-6 Carboxylic Acid

C9-11 PARETH-6 CARBOXYLIC ACID

4.0

A gentle, semi-synthetic surfactant that effectively cleanses without over-drying, making it a good choice for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

C9-11 Pareth-8

C9-11 PARETH-8

3.5

A gentle cleansing agent that helps remove dirt and oil without stripping the skin, but may cause irritation in sensitive individuals at high concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

C9-12 Alkane

C9-12 Alkane

4.0

A lightweight, non-greasy emollient that helps products spread smoothly and leaves a silky finish without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Solvent

C9-12 Isoalkanes

C9-12 ISOALKANES

4.0

A gentle, fast-evaporating hydrocarbon that helps products spread smoothly without leaving a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-12 Isoparaffin

C9-12 Isoparaffin

3.5

A lightweight, volatile solvent that helps products spread smoothly and evaporate quickly, leaving a non-greasy finish.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Film-Former

C9-13 Fluoroalcohol

C9-13 Fluoroalcohol

3.5

A synthetic film-former that helps products resist water and wear, but its environmental persistence raises concerns.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Solvent

C9-13 Isoparaffin

C9-13 Isoparaffin

3.5

A lightweight synthetic oil that helps products spread smoothly and dissolve makeup, generally safe for most skin types.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Solvent

C9-14 Isoparaffin

C9-14 Isoparaffin

3.5

A lightweight synthetic oil that helps products glide on smoothly without a greasy feel.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Surfactant

C9-15 Alkyl Phosphate

C9-15 Alkyl Phosphate

3.5

A mild synthetic surfactant that helps cleanse without stripping, but may be slightly drying for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

C9-15 Fluoroalcohol Phosphate

C9-15 Fluoroalcohol Phosphate

3.5

A synthetic surfactant that helps ingredients spread evenly and stay put, but its fluorinated nature raises environmental persistence concerns.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

C9-15 Pareth-8

C9-15 PARETH-8

3.5

A synthetic cleansing agent that helps remove dirt and oil, but may be drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

C9-16 Alkane/Cycloalkane

C9-16 Alkane/Cycloalkane

4.0

A lightweight, silicone-like emollient that spreads easily and evaporates quickly, leaving a non-greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Solvent

C9-16 Isoparaffin

C9-16 Isoparaffin

3.8

A safe, lightweight solvent that helps products spread easily and evaporate quickly, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Soothing Agent

Cabbage Leaf Water

Brassica Oleracea Capitata Leaf Water

3.8

Cabbage leaf water is a gentle, hydrating ingredient that may help soothe the skin, but research on its specific benefits is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Antioxidant

Cabbage Sprout Extract

BRASSICA OLERACEA CAPITATA (CABBAGE) SPROUT EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Cabreuva Wood Oil

Myrocarpus Frondosus Wood Oil

3.8

Cabreuva Wood Oil adds a warm, woody scent to products and may offer mild soothing benefits, but its fragrance components can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Cacao Callus Powder

THEOBROMA CACAO CALLUS POWDER

3.8

A gentle, antioxidant-rich plant ingredient from cacao cells that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Cacao Flower Extract

THEOBROMA CACAO FLOWER EXTRACT

4.0

A gentle, antioxidant-rich botanical 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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Antioxidant

Cacao Fruit Extract

THEOBROMA CACAO FRUIT EXTRACT

4.0

A gentle, antioxidant-rich extract from the cacao fruit that helps protect skin from environmental stress and may support a healthy glow.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Cacao Fruit Powder

THEOBROMA CACAO FRUIT POWDER

4.0

A gentle, antioxidant-rich powder from cacao fruit that can help soothe and protect the skin, but it's not a cure-all and may not suit very sensitive skin in high concentrations.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Cacao Leaf Cell Extract

THEOBROMA CACAO LEAF CELL EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Cacao Seed Water

THEOBROMA CACAO SEED WATER

4.0

A gentle, antioxidant-rich water from cacao seeds that hydrates and soothes skin without the heaviness of cocoa butter.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Cacao Shell Extract

THEOBROMA CACAO SHELL EXTRACT

4.0

A gentle, antioxidant-rich extract from cacao shells that helps protect skin from environmental stress without irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Cade Wood Oil

JUNIPERUS OXYCEDRUS WOOD OIL

3.8

Cade Wood Oil offers purifying and soothing benefits but can be irritating for sensitive skin due to its potent aromatic compounds.

Irritation

moderate

Source

natural

beautyskincareessential oil
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Exfoliant

Cade Wood Powder

Juniperus Oxycedrus Wood Powder

3.5

A natural wood powder that gently exfoliates and absorbs excess oil, but may feel gritty and can be drying for sensitive skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review

Fragrance

Cadinene

CADINENE

3.5

Cadinene is a natural fragrance component with some antioxidant potential, but its benefits in skincare are not well-established and it may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Caffeic Acid

CAFFEIC ACID

4.0

Caffeic acid is a gentle antioxidant that helps defend skin against pollution and UV damage, but it's not a replacement for sunscreen or vitamin C.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Caffeine

Caffeine

4.2

Caffeine is a popular skincare ingredient that can temporarily tighten skin and reduce puffiness, but its long-term anti-aging benefits are still being studied.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Caffeine Benzoate

Caffeine Benzoate

3.8

Caffeine benzoate is a gentle, semi-synthetic form of caffeine that may help reduce puffiness and provide antioxidant protection, but its effects are temporary and best used in targeted treatments.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Caffeine Carboxylic Acid

Caffeine Carboxylic Acid

3.8

A gentler, modified caffeine that may help protect skin from environmental stress and support a more even tone, though research is still early.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Anti-aging agent

Caffeine Decapeptide-1

Caffeine Carboxyloyl SH-Decapeptide-1

3.8

A hybrid peptide-caffeine ingredient that may help firm skin and fight oxidative stress, but research is still early.

Irritation

low

Source

semi-synthetic

beautyskincarepeptide
Read ingredient review