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

Porphyridium Zinc Ferment

PORPHYRIDIUM/ZINC FERMENT

4.0

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

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Portuguese Cypress Callus Extract

Cupressus Lusitanica Callus Extract

3.8

A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Portulaca Molokiniensis Extract

Portulaca Molokiniensis Extract

4.0

A gentle, antioxidant-rich extract from a rare Hawaiian succulent that may help calm irritated skin and fight free radical damage.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Humectant

Postelsia Palm Extract

Postelsia Palmaeformis Thallus Extract

4.0

A gentle, ocean-sourced extract that helps hydrate and calm the skin, but research on its benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Surfactant

Potassium Abietoyl Hydrolyzed Collagen

POTASSIUM ABIETOYL HYDROLYZED COLLAGEN

3.8

A gentle, amino-acid-based surfactant that cleanses without stripping, making it a good choice for sensitive or dry skin and hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
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Flavoring Agent

Potassium Acesulfame

POTASSIUM ACESULFAME

2.5

A safe synthetic sweetener used in tiny amounts to improve taste in lip and oral products, but it offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincareflavoring agent
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Buffering Agent

Potassium Acetate

Potassium Acetate

3.5

Potassium Acetate is a safe, low-irritation salt that helps control a product's pH and can support preservative systems.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Film Former

Potassium Acrylates Copolymer

POTASSIUM ACRYLATES/ETHYLHEXYL ACRYLATE COPOLYMER

4.0

A safe, synthetic polymer that gives products a silky feel and helps them spread evenly without clogging pores.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Thickener

Potassium Alginate

Potassium Alginate

4.0

A gentle, seaweed-derived thickener that gives products a smooth gel feel and can create a temporary tightening sensation on skin.

Irritation

low

Source

natural

beautyskincarethickener
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Astringent

Potassium Alum

POTASSIUM ALUM

3.5

Potassium alum is a mineral salt that tightens skin and reduces sweat, but its safety is debated due to aluminum content.

Irritation

moderate

Source

natural

beautyskincareastringent
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Thickener

Potassium Aluminum Polyacrylate

POTASSIUM ALUMINUM POLYACRYLATE

3.5

A synthetic thickener that gives water-based products a smooth, gel-like feel; generally safe but not a functional active ingredient.

Irritation

low

Source

synthetic

beautyskincaretexturizer
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Antioxidant

Potassium Ascorbate

Potassium Ascorbate

4.0

A gentler, more stable form of vitamin C that brightens skin and fights free radicals with less irritation than pure ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Potassium Ascorbyl Tocopheryl Phosphate

Potassium Ascorbyl Tocopheryl Phosphate

4.3

A stable, dual-antioxidant ingredient that helps brighten skin and fight free radical damage without the irritation of pure vitamin C.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Potassium Ascorbylborate

Potassium Ascorbylborate

4.0

A gentler, more stable vitamin C derivative that brightens skin and fights free radicals with less sting than pure ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Brightening agent

Potassium Azeloyl Diglycinate

POTASSIUM AZELOYL DIGLYCINATE

4.3

A well-tolerated alternative to azelaic acid that helps fade dark spots, calm redness, and refine pores without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarebrighteningsoothing
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Surfactant

Potassium Babassuate

Potassium Babassuate

4.0

A mild, plant-derived soap that cleans without stripping the skin, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Potassium Behenate

Potassium Behenate

4.0

A gentle soap ingredient that helps create a creamy lather and is generally well-tolerated by most skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Preservative

Potassium Benzoate

POTASSIUM BENZOATE

4.0

A gentle, widely used preservative that helps keep your products safe from bacteria and mold without common irritation.

Irritation

low

Source

synthetic

beautyskincarepreservative
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pH Adjuster

Potassium Bicarbonate

POTASSIUM BICARBONATE

3.8

Potassium bicarbonate is a gentle pH adjuster that helps keep your skincare products stable and comfortable on skin, but it is not a star active ingredient.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
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pH Adjuster

Potassium Biphthalate

POTASSIUM BIPHTHALATE

1.0

Potassium Biphthalate is a lab buffer with no proven skincare benefits; it's rarely used in cosmetics and offers no direct skin improvement.

Irritation

low

Source

synthetic

beautyskincarebuffer
Read ingredient review

pH Adjuster

Potassium Bitartrate

POTASSIUM BITARTRATE

3.8

A gentle, food-derived ingredient that helps balance pH and provide mild exfoliation without harshness.

Irritation

low

Source

natural

beautyskincarepH adjuster
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Surfactant

Potassium Borageate

Potassium Borageate

4.0

A gentle, plant-derived cleansing agent that helps remove dirt and oil without stripping the skin, making it suitable for sensitive skin.

Irritation

low

Source

natural

beautyskincaresurfactant
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Buffering Agent

Potassium Borate

POTASSIUM BORATE

2.5

Potassium borate is a synthetic salt used to adjust pH and preserve products, but it raises safety concerns due to its boron content and potential for irritation.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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Preservative

Potassium Bromide

POTASSIUM BROMIDE

2.5

Potassium bromide is a synthetic salt used as a preservative, but it has limited cosmetic use and potential irritation concerns.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

Preservative

Potassium Butylparaben

Potassium Butylparaben

2.8

A paraben preservative that is effective but controversial due to potential endocrine concerns; many brands now avoid it.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Surfactant

Potassium Camelliates

POTASSIUM CAMELLIATE

4.0

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

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Caprate

Potassium Caprate

3.8

Potassium caprate is an effective, plant-derived cleanser, but it can be drying or irritating for sensitive skin types if used in high concentrations.

Irritation

moderate

Source

natural

beautyskincarecleansing agent
Read ingredient review

Skin brightener

Potassium Caproyl Tyrosine

POTASSIUM CAPROYL TYROSINE

4.0

A gentle, amino-acid-based brightener that helps fade dark spots without the irritation of stronger alternatives.

Irritation

low

Source

semi-synthetic

beautyskincarebrightening agent
Read ingredient review

Surfactant

Potassium Caprylate

Potassium Caprylate

4.0

Potassium Caprylate is an effective, mild cleansing agent that helps remove dirt and oil without stripping the skin, but may be drying for very sensitive skin types.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Potassium Caprylate/Caprate

Potassium Caprylate/Caprate

4.0

A gentle, plant-derived cleansing agent that effectively removes dirt and oil without stripping the skin.

Irritation

low

Source

natural

beautyskincarecleansing agent
Read ingredient review

Viscosity Controlling

Potassium Carbomer

Potassium Carbomer

4.0

A safe, effective thickener that gives gels and creams a smooth, non-greasy feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincarethickener
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pH Adjuster

Potassium Carbonate

Potassium Carbonate

3.5

Potassium carbonate is a safe pH adjuster in tiny amounts, but can be irritating if used too high in leave-on products.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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Oxidizing agent

Potassium Caroate

POTASSIUM CAROATE

2.5

Potassium Caroate is a strong oxidizer used for bleaching and antimicrobial effects, but it can be irritating and is not common in everyday skincare.

Irritation

high

Source

synthetic

beautyskincareoxidizing agent
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Surfactant

Potassium Castorate

POTASSIUM CASTORATE

4.0

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

Irritation

low

Source

natural

beautyskincarecleanser
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Film Former

Potassium Cellulose Succinate

Potassium Cellulose Succinate

4.0

A gentle, plant-derived film former that helps products spread smoothly and leaves a comfortable, non-sticky feel on skin.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Viscosity Controlling Agent

Potassium Chloride

POTASSIUM CHLORIDE

3.5

Potassium chloride is a safe, common salt used to adjust product thickness and stability, not a star active ingredient.

Irritation

low

Source

natural

beautyskincareviscosity controlling agent
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pH Adjuster

Potassium Citrate

POTASSIUM CITRATE

4.0

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

Irritation

low

Source

synthetic

beautyskincarepH adjuster
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Surfactant

Potassium Cocoate

Potassium Cocoate

4.0

A gentle, coconut-derived soap ingredient that effectively cleanses without stripping the skin.

Irritation

low

Source

natural

beautyskincarecleansing
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Surfactant

Potassium Cocoyl Amino Acids

POTASSIUM COCOYL (ARGININE/GLUTAMIC ACID/ISOLEUCINE/LEUCINE/LYSINE/PHENYLALANINE/PROLINE/THREONINE/VALINE)

4.5

A mild, amino-acid-based surfactant that effectively cleanses while respecting the skin barrier.

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Cocoyl Barley Amino Acids

POTASSIUM COCOYL BARLEY AMINO ACIDS

4.5

A mild, amino-acid-based cleanser that effectively removes dirt and oil while respecting your skin's pH and moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Cocoyl Hydrolyzed Collagen

Potassium Cocoyl Hydrolyzed Collagen

4.0

A mild, coconut-derived cleanser that also helps hair and skin feel soft, but its collagen content is too large to penetrate deeply.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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