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

Emollient

Ozonized Sunflower Seed Oil

Ozonized Helianthus Annuus (Sunflower) Seed Oil

3.8

Ozonized sunflower seed oil is a semi-synthetic emollient that may help calm skin and support a clearer complexion, but research on its cosmetic benefits is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Antimicrobial

Ozonized Turpentine

Ozonized Turpentine

3.5

Ozonized turpentine is a niche ingredient with potential antimicrobial benefits, but its strong odor and irritation risk limit its appeal for everyday skincare.

Irritation

moderate

Source

semi-synthetic

beautyskincareantimicrobial
Read ingredient review

Antioxidant

Ozonized Yeast Ferment Filtrate

Ozonized Saccharomyces Ferment Lysate Filtrate

3.8

A novel fermented yeast ingredient with ozonation that may support skin antioxidant defenses, but human research is still limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Preservative booster

p-Anisic Acid

P-ANISIC ACID

4.0

p-Anisic acid is a mild, naturally derived preservative helper that also offers gentle antioxidant and soothing benefits, making it a safe choice for most skin types.

Irritation

low

Source

natural

beautyskincarepreservative
Read ingredient review

Fragrance Ingredient

P-Anisonitrile

P-ANISONITRILE

3.5

P-Anisonitrile is a synthetic fragrance compound that adds a sweet, anise-like scent to products, but it offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Anisyl Acetate

P-ANISYL ACETATE

3.5

P-Anisyl Acetate is a synthetic fragrance compound that adds a sweet, floral scent to products, but it offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Anisyl Butyrate

P-ANISYL BUTYRATE

3.5

P-Anisyl Butyrate is a synthetic fragrance ingredient with a pleasant, sweet, floral scent; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Anisyl Formate

P-ANISYL FORMATE

3.5

P-Anisyl Formate is a synthetic fragrance compound that adds a pleasant floral-sweet note to products, but offers no skincare benefits and may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

P-Anisyl Isobutyrate

P-ANISYL ISOBUTYRATE

4.0

P-Anisyl Isobutyrate is a synthetic fragrance ingredient that adds a sweet, floral scent to products; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Anisyl Methyl Ketone

P-ANISYL METHYL KETONE

3.5

A synthetic scent ingredient that adds a sweet, pleasant aroma but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Anisyl Phenylacetate

P-ANISYL PHENYLACETATE

3.5

A synthetic fragrance ester that adds a sweet, floral scent to products; generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Anisyl Propionate

P-ANISYL PROPIONATE

3.5

A synthetic fragrance ingredient that adds a sweet, floral scent; considered safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Cresol

P-CRESOL

2.5

P-Cresol is a synthetic fragrance and preservative compound that can be irritating; it is rarely used in modern leave-on skincare and is best avoided by sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrancepreservative
Read ingredient review

Fragrance Ingredient

P-Cresyl 3-Methylcrotonate

P-CRESYL 3-METHYLCROTONATE

3.5

A synthetic fragrance compound that adds scent but offers no skincare benefit; may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Cresyl 3-Oxo-3-Phenylpropionate

P-CRESYL 3-OXO-3-PHENYLPROPIONATE

3.0

A synthetic fragrance ingredient with limited public safety data; best for those who tolerate synthetic fragrances well.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Cresyl Benzoate

P-CRESYL BENZOATE

3.5

P-Cresyl Benzoate is a synthetic fragrance ingredient with limited safety data; it may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

p-Cresyl Isobutyrate

P-CRESYL ISOBUTYRATE

3.5

p-Cresyl Isobutyrate is a synthetic fragrance ingredient that adds a sweet, floral note to products, but it offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Cresyl Isovalerate

P-CRESYL ISOVALERATE

3.5

A synthetic fragrance ester that adds a sweet, floral note to products but offers no skincare benefit beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Cresyl Methyl Ether

P-CRESYL METHYLETHER

3.5

P-Cresyl Methyl Ether is a synthetic fragrance component that adds a pleasant floral note but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Cresyl Octanoate

P-CRESYL OCTANOATE

3.5

A synthetic ester that adds a subtle scent and light conditioning feel, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

P-Cresyl Propionate

P-CRESYL PROPIONATE

3.5

A synthetic fragrance ingredient that adds a pleasant floral scent but offers no skincare benefits and may be unnecessary for sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

p-Cresyloxyacetaldehyde Dimethyl Acetal

P-CRESYLOXYACETALDEHYDE DIMETHYL ACETAL

3.5

A synthetic fragrance compound that adds a floral hyacinth note but offers no skincare benefit; safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

P-Cymene

P-CYMENE

3.8

P-Cymene is a plant-derived antioxidant that may help protect skin from environmental stress, but research on its topical benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

P-Ethylphenetole

P-ETHYLPHENETOLE

3.5

P-Ethylphenetole is a synthetic fragrance ingredient with limited published safety data; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

p-Hydroxyanisole

P-HYDROXYANISOLE

3.5

p-Hydroxyanisole is a synthetic stabilizer that prevents oils from going rancid, but it may cause irritation in sensitive individuals at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Preservative

p-Isopropylphenol

P-ISOPROPYLPHENOL

3.5

p-Isopropylphenol is a synthetic preservative that helps keep products fresh, but it may cause irritation for sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

Fragrance

P-Isopropylphenyl Methyl Ketone

P-ISOPROPYLPHENYL METHYL KETONE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

P-Menthadiene

P-MENTHA-1,4-DIENE

3.5

P-Menthadiene is a natural fragrance compound with mild antioxidant potential, but it may cause skin sensitivity in some people.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

P-Menthanone

P-MENTHANONE

3.5

P-Menthanone is a synthetic fragrance ingredient that adds a minty or herbal note, but it offers no direct skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

P-Menthanyl Acetate

P-MENTHANYL ACETATE

3.5

A synthetic minty fragrance that adds a fresh scent but may cause irritation for sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Cooling agent

P-Menthen-6-Yl Propanone

P-MENTHEN-6-YL-PROPANONE

4.0

A synthetic cooling ingredient that creates a refreshing, minty sensation on skin without the strong scent of actual mint.

Irritation

low

Source

synthetic

beautyskincaresensory modifier
Read ingredient review

Fragrance

P-Methoxybutylidene Cyclohexane

P-METHOXYBUTYLIDENE-CYCLOHEXANE

3.5

A synthetic fragrance ingredient that adds a pleasant floral note but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

p-Methoxycinnamaldehyde

P-METHOXYCINNAMALDEHYDE

3.5

A plant-derived aromatic compound with antioxidant potential, but its strong scent and moderate irritation risk limit its use in skincare.

Irritation

moderate

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

P-Methoxypropiophenone

P-METHOXYPROPIOPHENONE

3.0

P-Methoxypropiophenone is a synthetic fragrance compound with limited safety data; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Methyl Acetophenone

P-METHYL ACETOPHENONE

3.5

A synthetic fragrance ingredient that adds a sweet, floral scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

p-Methylhydrocinnamic Aldehyde

P-METHYLHYDROCINNAMIC ALDEHYDE

3.5

A synthetic fragrance compound that adds scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

p-tert-Butyl Acetophenone

P-TERT-BUTYL ACETOPHENONE

3.5

A synthetic fragrance ingredient that adds a floral, sweet scent but offers no skincare benefit and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

p-tert-Butylphenyl Acetate

P-TERT-BUTYLPHENYL ACETATE

3.5

A synthetic fragrance ingredient that adds scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

p-tert-Butylphenyl Acetonitrile

P-TERT-BUTYLPHENYL ACETONITRILE

3.0

A synthetic fragrance ingredient that adds a floral, sweet scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

p-tert-Butylphenylisobutanol

P-TERT-BUTYLPHENYLISOBUTANOL

3.5

A synthetic floral scent ingredient that is generally safe at low levels but may cause skin reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

p-Tolyl Phenylacetate

P-TOLYL PHENYLACETATE

3.5

p-Tolyl Phenylacetate is a synthetic fragrance ingredient that adds a floral, honey-like scent to products; it is generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

P-Vinylphenol

P-VINYLPHENOL

2.5

P-Vinylphenol is a synthetic fragrance compound with limited cosmetic research; it may pose irritation risks and is not a functional skincare active.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Paecilomyces Japonica Ferment Extract

PAECILOMYCES JAPONICA/CYNANCHUM WILFORDII ROOT FERMENT EXTRACT FILTRATE

3.8

A fermented blend of a medicinal mushroom and a root extract that may offer antioxidant and soothing benefits, though research is still emerging.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Emollient

Paeonia Rockii Seed Oil

PAEONIA ROCKII SEED OIL

4.3

A nourishing, non-greasy oil rich in omega fatty acids and antioxidants that helps soften skin and support a healthy moisture barrier.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Paeonol

PAEONOL

4.0

Paeonol is a gentle antioxidant from peony that may help calm skin and fight environmental stress, but human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Absorbent

Pakau White Clay

Kaolin (and) Montmorillonite

4.0

Pakau White Clay is a mild, absorbent clay ideal for oily or combination skin, offering gentle purification without harshness.

Irritation

low

Source

natural

beautyskincareabsorbent
Read ingredient review

Absorbent

Palau White Clay

Palau White Clay

4.0

Palau White Clay is a gentle, mineral-rich clay that helps absorb excess oil and impurities without stripping the skin, making it a good option for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincareabsorbent
Read ingredient review

Absorbent

Palau White Clay Extract

Palau White Clay Extract

3.8

A gentle clay extract that helps absorb excess oil and impurities without stripping the skin, but research on its unique benefits is still limited.

Irritation

low

Source

natural

beautyskincareabsorbent
Read ingredient review

Antioxidant

Pale Goosefoot Seed Extract

Chenopodium pallidicaule seed extract

3.8

A gentle, plant-derived antioxidant that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Pale Iris Leaf Cell Extract

Iris Pallida Leaf Cell Extract

4.0

A gentle, plant-derived antioxidant that may help calm skin and protect against environmental stress, though research is still emerging.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Pale Licorice Root Extract

Glycyrrhiza Pallidiflora Root Extract

4.0

A gentle, plant-based ingredient that may help calm redness and provide antioxidant protection, though research is less extensive than for other licorice extracts.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Colorant

Palladium

PALLADIUM

2.0

Palladium is a rare metal used mainly as a colorant in cosmetics, not a proven skincare active, and may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarecolorant
Read ingredient review

Antioxidant

Palm Fruit Extract

Elaeis Guineensis Fruit Extract

3.8

A gentle antioxidant-rich fruit extract that helps protect skin from environmental stress while providing light hydration.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Palm Fruit Oil

Elaeis Oleifera Fruit Oil

3.8

A rich, plant-based emollient that softens skin but may clog pores for some people, and its sourcing raises environmental concerns.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Palm Glyceride

Palm Glyceride

4.0

A gentle, plant-derived emollient that helps replenish the skin's natural moisture barrier without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Palm Kernel Alcohol

PALM KERNEL ALCOHOL

4.0

A gentle fatty alcohol that softens skin and improves product texture without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Palm Kernel Oil

Elaeis Oleifera Kernel Oil

3.8

Palm kernel oil is a rich emollient that softens skin but may clog pores for some, and its sourcing raises environmental concerns.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review