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

Surfactant

Sodium Carboxymethyl Tallow Polypropylamine

SODIUM CARBOXYMETHYL TALLOW POLYPROPYLAMINE

3.5

A semi-synthetic surfactant and conditioner from tallow that can improve feel and foam but may be too heavy or irritating for sensitive or acne-prone skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Sodium Castorate

Sodium Castorate

3.5

Sodium Castorate is a gentle, plant-derived soap ingredient that effectively cleanses but may be drying for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarecleansing agent
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Surfactant

Sodium Ceteareth-13 Carboxylate

Sodium Ceteareth-13 Carboxylate

4.0

A gentle, soap-free surfactant that cleans without stripping the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Sodium Ceteth-13 Carboxylate

SODIUM CETETH-13 CARBOXYLATE

4.0

A gentle, soap-free cleansing ingredient that helps remove dirt and oil without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Surfactant

Sodium Ceteth-4 Phosphate

Sodium Ceteth-4 Phosphate

4.0

A gentle, phosphate-based surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Sodium Cetyl Sulfate

Sodium Cetyl Sulfate

3.5

Sodium Cetyl Sulfate is a mild surfactant that effectively cleanses without being as harsh as Sodium Lauryl Sulfate, but it can still cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
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Chelating Agent

Sodium Chitosan Methylene Phosphonate

SODIUM CHITOSAN METHYLENE PHOSPHONATE

4.0

A gentle, multi-tasking chitosan derivative that helps stabilize formulas and improve skin feel without common irritants.

Irritation

low

Source

semi-synthetic

beautyskincarechelating agent
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Preservative

Sodium Chlorate

SODIUM CHLORATE

2.0

Sodium chlorate is rarely used in skincare and is more common in industrial or oral care products; it may pose irritation risks and is not recommended for routine cosmetic use.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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Thickener

Sodium Chloride

Sodium Chloride

3.5

Sodium chloride is safe in small amounts but can be drying or irritating for sensitive skin in high concentrations.

Irritation

low

Source

natural

beautyskincarethickener
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Preservative

Sodium Chlorite

Sodium Chlorite

3.0

Sodium chlorite is a strong preservative that can be effective at low levels, but it requires careful formulation to avoid skin irritation.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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Surfactant

Sodium Cholate

Sodium Cholate

3.8

A mild, naturally-derived surfactant that helps cleanse without stripping the skin barrier.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Skin conditioning agent

Sodium Cholesteryl Sulfate

Sodium Cholesteryl Sulfate

4.0

A gentle, skin-identical lipid that supports barrier function and helps other ingredients absorb better.

Irritation

low

Source

semi-synthetic

beautyskincareemollientskin-identical ingredient
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Preservative booster

Sodium Cinnamate

Sodium Cinnamate

3.8

Sodium Cinnamate is a gentle preservative booster that helps keep products fresh, but it's not a standalone preservative and may cause mild sensitivity in very rare cases.

Irritation

low

Source

semi-synthetic

beautyskincarepreservative
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pH Adjuster

Sodium Citrate

Sodium Citrate

4.5

Sodium citrate is a gentle pH adjuster that helps keep your skincare products stable and comfortable on your skin.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
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Surfactant

Sodium Citronellate

SODIUM CITRONELLATE

3.8

A mild, natural-origin surfactant and scent ingredient that helps cleanse and lightly fragrance products, but may cause sensitivity in those allergic to citronella or related botanicals.

Irritation

low

Source

natural

beautyskincarecleansingfragrance
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Surfactant

Sodium Cocaminopropionate

Sodium Cocaminopropionate

4.3

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

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Coceth-30 Sulfate

SODIUM COCETH-30 SULFATE

3.8

A gentle, coconut-derived surfactant that cleanses effectively with less irritation than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Surfactant

Sodium Coco PG-Dimonium Chloride Phosphate

SODIUM COCO PG-DIMONIUM CHLORIDE PHOSPHATE

4.0

A gentle coconut-derived surfactant and conditioner that cleans without stripping, making it a good choice for sensitive or dry hair and skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Coco Sulfoacetate

SODIUM COCO SULFOACETATE

4.5

A gentle, coconut-derived cleanser that effectively removes dirt and oil without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Sodium Coco-Sulfate

Sodium Coco-Sulfate

3.8

A coconut-derived surfactant that cleans effectively but can be drying for sensitive or dry skin types.

Irritation

moderate

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Coco/Babassu Sulfate

SODIUM COCO/BABASSU SULFATE

4.0

A gentle, plant-based sulfate that cleanses effectively without the harshness of traditional sodium lauryl sulfate.

Irritation

low

Source

natural

beautyskincarecleansing agent
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Surfactant

Sodium Cocoa Butterate

Sodium Cocoa Butterate

4.0

A mild, natural cleanser derived from cocoa butter that cleans without stripping the skin.

Irritation

low

Source

natural

beautyskincarecleansing agent
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Surfactant

Sodium Cocoamphoacetate

Sodium Cocoamphoacetate

4.3

A gentle, coconut-derived cleanser that effectively removes dirt and oil while being kind to sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Sodium Cocoate

Sodium Cocoate

4.0

Sodium cocoate is a natural, effective cleanser from coconut oil, but can be drying for sensitive or dry skin types.

Irritation

moderate

Source

natural

beautyskincarecleansing agent
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Surfactant

Sodium Cocomono glyceride Sulfate

SODIUM COCOMONOGLYCERIDE SULFATE

4.0

A gentle, coconut-derived surfactant that cleans without stripping the skin, making it a great alternative to harsher sulfates.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Cocoyl Alaninate

Sodium Cocoyl Alaninate

4.5

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

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Cocoyl Glutamate

SODIUM COCOYL GLUTAMATE

4.5

A gentle, coconut-derived cleanser that effectively removes impurities while respecting the skin barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Sodium Cocoyl Glycinate

Sodium Cocoyl Glycinate

4.5

A mild, coconut-derived cleanser that effectively removes dirt and oil without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Sodium Cocoyl Hydrolyzed Collagen

SODIUM COCOYL HYDROLYZED COLLAGEN

4.0

A gentle, coconut-derived cleanser that also conditions skin and hair, making it a good choice for sensitive or dry types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Cocoyl Hydrolyzed Keratin

SODIUM COCOYL HYDROLYZED KERATIN

4.0

A mild, protein-based surfactant that cleanses without stripping and helps strengthen hair, but may not suit those with protein-sensitive hair.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Sodium Cocoyl Hydrolyzed Rice Protein

SODIUM COCOYL HYDROLYZED RICE PROTEIN

4.5

A mild, plant-based cleanser that removes dirt without stripping the skin, making it ideal for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarecleanser
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