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 1,097
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

PPG-6 Sorbeth-245

PPG-6-SORBETH-245

3.8

A reliable synthetic emulsifier that helps create stable, smooth lotions and creams with low irritation potential.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

PPG-6 Trideceth-8

PPG-6 Trideceth-8

3.5

PPG-6 Trideceth-8 is a synthetic emulsifier that helps mix oil and water in cleansers, but it may be slightly drying for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Surfactant

PPG-6-Deceth-9

PPG-6-Deceth-9

3.5

A synthetic emulsifier that helps mix oil and water, but may cause irritation in sensitive skin at high concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Emulsifier

PPG-6-Decyltetradeceth-30

PPG-6-DECYLTETRADECETH-30

4.0

A reliable synthetic emulsifier that helps keep your skincare products stable and smooth without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

PPG-69 Phosphate

PPG-69 Phosphate

4.0

A gentle synthetic emulsifier that helps cleansers rinse cleanly without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

PPG-7-Buteth-10

PPG-7-Buteth-10

3.8

A mild synthetic emulsifier that helps mix oil and water in cleansers and shampoos, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PPG-7-Buteth-4

PPG-7-Buteth-4

3.8

A gentle synthetic emulsifier that helps oil and water mix, making creams and cleansers stable and effective.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PPG-8-Deceth-6

PPG-8-Deceth-6

3.8

A mild synthetic surfactant that helps products foam and rinse cleanly, generally well-tolerated but not a star active ingredient.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

PPG-9 Ethylhexeth-5

PPG-9 Ethylhexeth-5

3.8

A gentle synthetic emulsifier that helps cleanse without stripping the skin, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

PPG-9-Buteth-12

PPG-9-BUTETH-12

3.5

A synthetic emulsifier that helps products spread and rinse cleanly, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Emulsifier

Propylene Glycol Isodeceth-4

PROPYLENE GLYCOL ISODECETH-4

3.8

A gentle synthetic emulsifier that helps mix water and oil in products, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Emulsifier

Propylene Glycol Laureth-6

PROPYLENE GLYCOL LAURETH-6

3.8

A gentle synthetic emulsifier that helps mix oil and water in cleansers and lotions, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Pulsatilla Saponin

Pulsatilla Saponin

3.5

A gentle plant-based surfactant with mild cleansing and soothing potential, but research is limited and it may not replace more established ingredients.

Irritation

low

Source

natural

beautyskincaresurfactant
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Antistatic Agent

Quaternium-61

Quaternium-61

3.8

A gentle conditioning ingredient that helps reduce static and improve manageability in hair products, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarehaircaresurfactant
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Surfactant

Rice Branamide DEA

Ricebranamide DEA

3.5

A semi-synthetic emulsifier from rice bran oil that helps create stable, creamy cleansers but may be mildly irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Foam Booster

Ricinolamide MIPA

RICINOLEAMIDE MIPA

3.5

A mild foam booster and thickener that helps create a rich lather in cleansers, generally well-tolerated but not a primary active ingredient.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Foam Booster

Ricinoleamide DEA

RICINOLEAMIDE DEA

3.5

An effective foam booster and thickener, but may cause irritation for sensitive skin and has raised environmental concerns.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Ricinoleamide MEA

Ricinoleamide MEA

3.8

A mild surfactant derived from castor oil that helps create rich lather and thicken cleansers without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Ricinoleth-40

RICINOLETH-40

3.8

Ricinoleth-40 is a gentle emulsifier that helps blend oil and water, but may cause irritation in sensitive skin at high concentrations.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Emollient

Rosehip Oil PEG-8 Esters

Rosa Rubiginosa Seed Oil PEG-8 Esters

4.0

A water-friendly version of rosehip oil that delivers fatty acids without the greasy feel, ideal for lightweight hydration and gentle cleansing.

Irritation

low

Source

semi-synthetic

beautyskincareemollientsurfactant
Read ingredient review

Surfactant

Sesamide DEA

SESAMIDE DEA

3.0

Sesamide DEA helps create rich lather and thicken cleansers, but it may be mildly irritating and has moderate comedogenic potential.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Sesamidopropyl Betaine

SESAMIDOPROPYL BETAINE

4.0

A gentle, plant-derived surfactant that cleanses without stripping the skin, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Sesamidopropylamine Oxide

SESAMIDOPROPYLAMINE OXIDE

4.0

A gentle, sesame-derived surfactant that boosts foam and improves the feel of cleansers without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Shea Butteramide/Castoramide DEA

SHEA BUTTERAMIDE/CASTORAMIDE DEA

3.5

A gentle emulsifier and foam booster that helps blend oil and water in cleansers, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Sodium Beta-Sitosteryl Sulfate

SODIUM BETA-SITOSTERYL SULFATE

3.8

A gentle, plant-based surfactant that helps cleanse without stripping the skin, but it's not as widely studied as more common cleansing agents.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Sodium C13-15 Pareth-8 Phosphate

SODIUM C13-15 PARETH-8 PHOSPHATE

3.8

A gentle synthetic surfactant that helps cleanse without stripping the skin, but offers no direct skincare benefits beyond cleansing.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Sodium C16-18 Olefin Sulfonate

SODIUM C16-18 OLEFIN SULFONATE

3.5

A strong foaming cleanser that can be drying or irritating for sensitive skin, but is generally safe for normal skin types.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Sodium Capryloamphoacetate

Sodium Capryloamphoacetate

4.3

A gentle, coconut-derived surfactant that cleans effectively without stripping the skin barrier.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Sodium Carboxyethyl Tallow Polypropylamine

SODIUM CARBOXYETHYL TALLOW POLYPROPYLAMINE

3.5

An effective cleansing and conditioning ingredient, but may cause mild irritation for sensitive skin and has environmental concerns due to tallow sourcing.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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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 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 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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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 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 Cumenesulfonate

SODIUM CUMENESULFONATE

3.5

A synthetic helper that keeps cleansing formulas clear and stable, but can be drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Sodium Deoxycholate

Sodium Deoxycholate

3.5

Sodium deoxycholate is a bile salt that can help break down oils and improve ingredient absorption, but it may be irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Sodium Dioleth-8 Phosphate

Sodium Dioleth-8 Phosphate

3.8

A mild synthetic surfactant that helps cleansers foam and creams stay smooth, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Sodium Isostearate

Sodium Isostearate

4.0

Sodium Isostearate is a gentle cleansing and emulsifying ingredient that helps create stable, creamy formulas without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Sodium Laureth-2 Phosphate

Sodium Laureth-2 Phosphate

3.8

A gentle 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
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Surfactant

Sodium Laureth-4 Phosphate

Sodium Laureth-4 Phosphate

3.8

A gentle cleansing agent that helps remove dirt and oil without stripping the skin, but may not suit ultra-sensitive types if used in high amounts.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Sodium Laureth-8 Carboxylate

SODIUM LAURETH-8 CARBOXYLATE

3.8

A gentle, ethoxylated surfactant that cleans effectively without stripping the skin, but its ethoxylation process raises minor environmental and purity concerns.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Surfactant

Sodium Lauryl Phosphate

Sodium Lauryl Phosphate

3.8

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

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Surfactant

Sodium Lignosulfonate

SODIUM LIGNOSULFONATE

3.8

A mild, plant-derived surfactant that helps mix ingredients and improve product texture, but it's not a star active for skin benefits.

Irritation

low

Source

natural

beautyskincaresurfactant
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Surfactant

Sodium Mangoamphoacetate

Sodium Mangoamphoacetate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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