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

Surfactant

Potassium Lauroyl Oat Amino Acids

Potassium Lauroyl Oat Amino Acids

4.5

A mild, amino-acid-based surfactant that cleanses effectively while respecting the skin barrier, ideal for sensitive or dry skin.

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Lauroyl PCA

Potassium Lauroyl PCA

4.3

A mild, amino-acid-based cleanser that effectively removes dirt and oil while being gentle on the skin barrier.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Potassium Lauroyl Sarcosinate

Potassium Lauroyl Sarcosinate

4.3

A gentle, amino-acid-based cleanser that effectively removes impurities while being kind to sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Laurus Nobilate

Potassium Laurus Nobilate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Potassium Lauryl Aspartate

Potassium Lauryl Aspartate

4.0

A gentle, amino-acid-based surfactant that cleanses effectively while being kind to sensitive and dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Lauryl Phosphate

Potassium Lauryl Phosphate

4.0

A gentle, phosphate-based surfactant that cleanses effectively with low irritation potential, making it a good choice for sensitive skin.

Irritation

low

Source

synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Lauryl Sulfate

POTASSIUM LAURYL SULFATE

3.5

Potassium Lauryl Sulfate is a strong cleanser that can effectively remove dirt and oil but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Potassium Linoleate

Potassium Linoleate

3.8

Potassium Linoleate is an effective, gentle cleanser that helps remove dirt and oil, but may be drying for very sensitive or dry skin types.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Potassium Linseedate

POTASSIUM LINSEEDATE

3.8

A gentle, plant-derived cleansing agent that effectively removes impurities without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarecleansing agent
Read ingredient review

Humectant

Potassium Magnesium Aspartate

Potassium Magnesium Aspartate

3.8

A gentle mineral-amino acid blend that may help calm stressed skin and support natural hydration, though research is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
Read ingredient review

Preservative

Potassium Metabisulfite

Potassium Metabisulfite

3.5

Potassium Metabisulfite is an effective preservative but can be a common allergen, especially for those with sulfite sensitivity.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

Buffering Agent

Potassium Metaphosphate

POTASSIUM METAPHOSPHATE

4.0

A gentle pH adjuster and stabilizer that helps keep your skincare formulas balanced and effective without causing irritation.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

UV Filter

Potassium Methoxycinnamate

Potassium Methoxycinnamate

3.8

A synthetic UVB filter that helps shield skin from sunburn, but its use is limited in some regions due to regulatory differences.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

Surfactant

Potassium Methyl Cocoyl Taurate

POTASSIUM METHYL COCOYL TAURATE

4.5

A mild, sulfate-free surfactant that cleanses effectively without stripping the skin, making it ideal for sensitive and dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Preservative

Potassium Methylparaben

POTASSIUM METHYLPARABEN

3.5

A widely used preservative that prevents microbial growth, but has raised some safety concerns regarding potential endocrine disruption.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Oxidizing agent

Potassium Monopersulfate

POTASSIUM MONOPERSULFATE

2.0

Potassium monopersulfate is a strong oxidizer used mainly in hair lightening and disinfectant products; it is not a typical skincare ingredient and can be irritating.

Irritation

high

Source

synthetic

beautyskincareoxidizing agent
Read ingredient review

Surfactant

Potassium Myristate

Potassium Myristate

3.8

Potassium Myristate is an effective cleanser that creates rich lather, but it can be drying or irritating for sensitive or dry skin types.

Irritation

moderate

Source

synthetic

beautyskincarecleansing
Read ingredient review

Desensitizing Agent

Potassium Nitrate

POTASSIUM NITRATE

3.8

Potassium nitrate is a well-studied ingredient for reducing tooth sensitivity, but it is not typically used in skincare.

Irritation

low

Source

natural

beautyoral caredesensitizing agent
Read ingredient review

Preservative

Potassium O-Phenylphenate

Potassium O-Phenylphenate

3.5

A synthetic preservative that helps keep products fresh but may cause irritation for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

Preservative

Potassium Octatrienoate

POTASSIUM OCTATRIENOATE

4.0

A mild, well-tolerated preservative that helps keep your skincare products fresh and safe from spoilage.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Surfactant

Potassium Octoxynol-12 Phosphate

Potassium Octoxynol-12 Phosphate

3.5

An effective cleansing agent that helps remove oil and dirt, but may be drying or irritating for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Potassium Oleate

POTASSIUM OLEATE

3.5

Potassium oleate is an effective cleanser and emulsifier, but can be drying or irritating for sensitive skin due to its high pH.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Potassium Olivate

Potassium Olivate

4.3

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

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Olivoyl Amino Acids

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

4.3

A mild, amino-acid-based surfactant from olive oil that cleanses gently and is well-tolerated by sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Olivoyl Hydrolyzed Olive Protein

POTASSIUM OLIVOYL (ALANINE/ARGININE/ASPARAGINE/ASPARTIC ACID/GLUTAMIC ACID/ GLYCINE/ISOLEUCINE/LEUCINE/LYSINE/METHIONINE/PHENYLALANINE/PROLINE/SERINE/THREONINE/TRYPTOPHAN/TYROSINE/VALINE)

4.5

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

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Olivoyl PCA

POTASSIUM OLIVOYL PCA

4.5

A mild, olive-derived surfactant that cleanses effectively while respecting the skin barrier — ideal for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Potassium Olivoyl/Lauroyl Amino Acids

POTASSIUM LAUROYL/OLIVOYL (ALANINE/ARGININE/ASPARAGINE/ASPARTIC ACID/GLUTAMIC ACID/LYCINE/ISOLEUCINE/LEUCINE/LYSINE/METHIONINE/PHENYLALANINE/PROLINE/SERINE/THREONINE/TRYPTOPHAN/TYROSINE/VALINE)

4.5

A mild, plant-derived surfactant that cleanses effectively while respecting the skin barrier — ideal for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

pH Adjuster

Potassium Oxide

POTASSIUM OXIDE

1.5

Potassium oxide is a strong alkali rarely found in finished skincare; it is more relevant to soap chemistry than to leave-on products.

Irritation

high

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Viscosity Controlling

Potassium Oxidized Microcrystalline Wax

POTASSIUM OXIDIZED MICROCRYSTALLINE CERA

3.5

A modified wax that helps thicken and stabilize products, generally considered safe and non-irritating for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincarestabilizer
Read ingredient review

Surfactant

Potassium Palm Kernelate

Potassium Palm Kernelate

3.8

A natural soap-making ingredient that effectively cleanses but can be drying for some skin types.

Irritation

moderate

Source

natural

beautyskincarecleansing agent
Read ingredient review

Surfactant

Potassium Palmate

Potassium Palmate

3.5

An effective but potentially drying cleanser derived from palm oil, best for normal to oily skin types.

Irritation

moderate

Source

natural

beautyskincarecleansing agent
Read ingredient review

Surfactant

Potassium Palmitate

Potassium Palmitate

3.8

An effective cleanser that can be drying for some skin types, best suited for normal to oily skin in rinse-off products.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Preservative

Potassium Paraben

Potassium Paraben

3.5

Potassium Paraben is an effective preservative but has raised concerns about potential endocrine disruption, leading many brands to phase it out.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Surfactant

Potassium Peanutate

POTASSIUM PEANUTATE

3.5

A natural soap ingredient from peanut oil that cleanses effectively but may be drying or irritating for sensitive skin, and poses a risk for those with peanut allergies.

Irritation

moderate

Source

natural

beautyskincarecleansing
Read ingredient review

Oxidizing agent

Potassium Persulfate

POTASSIUM PERSULFATE

2.0

Potassium Persulfate is a strong oxidizer used in hair bleach; it can cause skin and eye irritation and is not suitable for everyday skincare.

Irritation

high

Source

synthetic

beautyhair careoxidizing agent
Read ingredient review

Preservative Booster

Potassium Phenoxide

Potassium Phenoxide

3.5

Potassium Phenoxide is a synthetic preservative booster that helps keep products fresh, but may cause irritation in sensitive individuals at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

pH Adjuster

Potassium Phosphate

Potassium Phosphate

4.2

A safe, synthetic pH adjuster that helps keep your skincare products stable and gentle on your skin.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
Read ingredient review