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

Antioxidant

Candlenut Bark Extract

Aleurites Moluccanus Bark Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Candlenut Extract

Aleurites Moluccanus Extract

3.8

A gentle, plant-derived extract that may help calm and hydrate the skin, but research is limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Emollient

Candlenut Seed Extract

Aleurites Moluccanus Seed Extract

4.0

A gentle, plant-based emollient that helps soften and soothe dry skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Soothing agent

Canna Hybrid Root Extract

Canna Hybrid Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Soothing Agent

Canna Indica Root Extract

Canna Indica Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Antioxidant

Canna Rhizome Extract

Canna Generalis Rhizome 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

Soothing agent

Cannabidiol

CANNABIDIOL

4.0

CBD is a trendy hemp-derived ingredient that may help calm redness and provide antioxidant protection, but research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Emollient

Canola Oil

CANOLA OIL

4.0

A gentle, non-comedogenic plant oil that hydrates and softens skin without clogging pores, suitable for most skin types.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Canola Oil Glyceride

CANOLA OIL GLYCERIDE

4.0

A mild, non-greasy emollient that helps soften and smooth skin with a low risk of irritation or clogged pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Canola Oil Unsaponifiables

CANOLA OIL UNSAPONIFIABLES

4.0

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

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Surfactant

Canolamidopropyl Betaine

Canolamidopropyl Betaine

4.0

A gentle, plant-based surfactant that cleanses without stripping the skin, ideal for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincaresurfactant
Read ingredient review

Antioxidant

Cantaloupe Callus Extract

CUCUMIS MELO CANTALUPENSIS CALLUS EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Cantaloupe Fruit Extract

Cucumis Melo Inodorus Fruit Extract

3.8

A gentle, water-loving fruit extract that helps hydrate skin and provides a modest dose of antioxidants, but its benefits are mild compared to more concentrated active ingredients.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
Read ingredient review

Soothing Agent

Cape Aloe Extract

Aloe Ferox Leaf Extract

4.0

A gentle, hydrating extract from the Cape aloe plant that helps calm and moisturize skin with antioxidant support.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Cape Chamomile Oil

Eriocephalus punctulatus oil

4.0

Cape chamomile oil is a gentle, aromatic oil that may help calm irritated skin and provide antioxidant benefits, but it is primarily used for its pleasant scent and soothing reputation.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Antioxidant

Caper Flower Extract

CAPPARIS SPINOSA FLOWER EXTRACT

4.0

A gentle, antioxidant-rich botanical extract that helps protect skin from environmental stress and may support a more even skin tone.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Capparis Moonii Fruit Extract

CAPPARIS MOONII FRUIT EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Surfactant

Capramide DEA

CAPRAMIDE DEA

3.5

Capramide DEA helps create rich lather and thicker formulas, but it may be irritating for sensitive skin and can be contaminated with potentially harmful impurities.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Cleansing Agent

Capric Acid

Capric Acid

4.0

Capric acid is a gentle fatty acid that helps cleanse and stabilize formulas, with mild antimicrobial benefits.

Irritation

low

Source

natural

beautyskincarecleansing agent
Read ingredient review

Fragrance

Caproic Acid

CAPROIC ACID

3.5

Caproic acid is a naturally occurring fatty acid used mainly for scent and mild cleansing, but it can be irritating for sensitive skin at higher levels.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Film Former

Caprolactone

Epsilon-Caprolactone

3.8

A synthetic polymer building block that helps create flexible, breathable films on skin for improved texture and wear.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Skin barrier supporter

Caprooyl Phytosphingosine

Caprooyl Phytosphingosine

4.2

A gentle, lipid-based ingredient that mimics natural skin components to strengthen the barrier and lock in moisture.

Irritation

low

Source

semi-synthetic

beautyskincarelipid
Read ingredient review

Skin Barrier Repair

Caprooyl Sphingosine

Caprooyl Sphingosine

4.3

A synthetic ceramide that mimics skin's natural lipids to strengthen the barrier and lock in moisture.

Irritation

low

Source

synthetic

beautyskincarelipid
Read ingredient review

Firming agent

Caprooyl Tetrapeptide-3

Caprooyl Tetrapeptide-3

4.0

A synthetic peptide that may help firm skin and reduce under-eye bags, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin-conditioning agent

Caprooyl Tetrapeptide-3 Amide

Caprooyl Tetrapeptide-3 Amide

4.1

A targeted peptide that may help firm the under-eye area and reduce the appearance of dark circles and bags.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Caproyl Dipeptide-21 Amide

Caproyl Dipeptide-21 Amide

3.8

A synthetic peptide that may help soften expression lines by temporarily relaxing facial muscles, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin Conditioner

Caproyl Lysine

N-Caproyl Lysine

4.0

A mild, amino-acid-based ingredient that helps condition skin and hair without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Skin barrier support

Caproyl Sphingosine

Caproyl Sphingosine

4.0

A skin-identical lipid that helps repair and strengthen the moisture barrier, ideal for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarelipid
Read ingredient review

Skin brightening agent

Caproyl Tyrosine

Caproyl Tyrosine

4.2

A gentle, amino-acid-derived brightener that supports even skin tone without the irritation of stronger alternatives.

Irritation

low

Source

semi-synthetic

beautyskincarebrightening agent
Read ingredient review

Emollient

Capryl Dimethicone

Capryl Dimethicone

4.0

A gentle silicone that makes products feel silky and spread easily without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Surfactant

Capryl Sultaine

Capryl Sultaine

4.3

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

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Capryl/Capramidopropyl Betaine

Capryl/Capramidopropyl Betaine

4.2

A gentle, coconut-derived surfactant that cleans effectively without stripping the skin, making it a popular choice for sensitive skin formulas.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Caprylamide MEA

Caprylamide MEA

3.8

Caprylamide MEA is a gentle, coconut-derived surfactant that helps create a rich lather without stripping the skin, making it a good alternative to harsher cleansers.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Capryleth-4

Capryleth-4

4.0

A gentle, water-soluble surfactant that helps cleanse and emulsify without stripping the skin, making it a good choice for sensitive skin formulations.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Capryleth-4 Carboxylic Acid

Capryleth-4 Carboxylic Acid

4.0

A gentle, synthetic surfactant that effectively cleanses without stripping the skin’s natural moisture barrier.

Irritation

low

Source

synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Capryleth-5

Capryleth-5

4.0

A gentle, well-tolerated emulsifier that helps mix oil and water in cleansers and lotions without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Capryleth-6 Carboxylic Acid

Capryleth-6 Carboxylic Acid

4.0

A gentle, low-irritation cleansing ingredient that effectively removes dirt and oil while being kind to sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Capryleth-9 Carboxylic Acid

Capryleth-9 Carboxylic Acid

4.0

A gentle, non-stripping surfactant that effectively cleanses while being kind to sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Preservative booster

Caprylhydroxamic Acid

Caprylhydroxamic Acid

4.5

A mild, effective preservative booster that helps prevent microbial growth without the harshness of traditional preservatives.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Cleansing Agent

Caprylic Acid

Caprylic Acid

4.0

Caprylic acid is a gentle, naturally derived fatty acid that helps cleanse and stabilize formulas without stripping the skin.

Irritation

low

Source

natural

beautyskincarecleansing agent
Read ingredient review

Emollient

Caprylic/Capric Triglyceride

Caprylic/Capric Triglyceride

4.5

A gentle, non-greasy emollient derived from coconut oil that hydrates and softens skin with minimal risk of clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Soothing agent

Capryloyl Argininamide HCl

CAPRYLYL LAUROYL ARGININAMIDE HCL

4.0

A gentle, lab-made ingredient that helps calm reactive skin by mimicking natural soothing signals in the body.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Skin lightening agent

Capryloyl Benzothiazine Carboxylic Acid

CAPRYLYLOXYPHENYLAMINO DIMETHYLTETRAHYDRO BENZOTHIAZINE CARBOXYLIC ACID

3.5

A synthetic brightener that targets melanin production, but research is still emerging compared to more established options.

Irritation

low

Source

synthetic

beautyskincarebrightening
Read ingredient review

Antioxidant

Capryloyl Carnosine

Capryloyl Carnosine

4.0

A gentle, fat-soluble antioxidant that helps protect skin from sugar-related damage and environmental stress, making it a smart addition to anti-aging routines.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Skin conditioning agent

Capryloyl Collagen Amino Acids

CAPRYLOYL COLLAGEN AMINO ACIDS

4.0

A gentle, oil-friendly amino acid derivative that helps condition and smooth skin without stripping.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Anti-aging agent

Capryloyl Dipeptide-17

Capryloyl Dipeptide-17

4.0

A synthetic peptide that may help improve skin firmness and reduce fine lines, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review