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 1,749
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

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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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

Fragrance

Palmarosa Oil

CYMBOPOGON MARTINI SOFIA HERB OIL

4.0

Palmarosa oil adds a pleasant floral scent and may help reduce bacteria on skin, but it can be irritating for sensitive skin if used at high concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Pandan Leaf Oil

PANDANUS ODORATISSIMUS OIL

3.8

Pandan leaf oil adds a pleasant natural fragrance and mild antioxidant benefits, but its strong aroma and limited research mean it's best for those who enjoy botanical scents and have no fragrance sensitivities.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Parsley Leaf Oil

Petroselinum Crispum Leaf Oil

3.8

Parsley Leaf Oil adds a fresh herbal scent and antioxidant benefits, but it can be irritating for sensitive skin and is best used in low concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Patchouli Leaf Oil

POGOSTEMON CABLIN LEAF OIL

3.8

Patchouli Leaf Oil adds a warm, earthy scent to products and may offer mild antioxidant benefits, but it's primarily a fragrance ingredient with limited direct skincare research.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance

Peel Oils

Citrus Aurantium Dulcis (Orange) Peel Oil, Citrus Limon (Lemon) Peel Oil, Citrus Paradisi (Grapefruit) Peel Oil

3.8

Peel oils add a fresh citrus scent and mild antioxidant activity, but they can be irritating for sensitive skin and are primarily used for fragrance.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Pentadecalactone

PENTADECALACTONE

4.0

Pentadecalactone is a synthetic musk that adds a pleasant, long-lasting scent to products, but it offers no skincare benefits and may be a concern for those avoiding synthetic fragrances.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Pentamethyl Cyclopentenyl Methyl Ketone

PENTAMETHYL-CYCLOPENT-1-ENYL METHYL KETONE

3.5

A synthetic fragrance ingredient 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

Pentamethyl Heptanol

PENTAMETHYL-2-HEPTANOL

3.5

A synthetic fragrance alcohol that adds a pleasant scent but offers no skincare benefits; generally safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Pentamethyl Octahydroindenodioxane

PENTAMETHYL OCTAHYDROINDENODIOXANE

3.5

A synthetic scent ingredient that gives a warm, woody aroma but offers no skin benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Pentamethyl Spirobicycloheptane Dioxane

Pentamethyl-Spirobicycloheptane-Dioxane

3.5

A synthetic fragrance ingredient that provides a woody, amber scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Pentamethylcyclopent-3-ene-butanol

PENTAMETHYLCYCLOPENT-3-ENE-BUTANOL

3.5

A synthetic fragrance ingredient that adds a pleasant floral-woody note but offers no skincare benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Pentamethylheptenone

PENTAMETHYLHEPTENONE

3.5

A synthetic scent ingredient that adds a pleasant floral-green note but offers no skincare benefit and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Peppermint Oil

Mentha Piperita (Peppermint) Oil

3.8

Peppermint oil adds a cooling tingle and fresh scent to products, but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Perillyl Alcohol

PERILLYL ALCOHOL

3.5

Perillyl alcohol is a natural aromatic compound with some antioxidant promise, but it's used in tiny amounts mainly for scent and may irritate sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Phenethyl 2-Ethylbutyrate

PHENETHYL 2-ETHYLBUTYRATE

3.5

A synthetic fragrance ester that adds a fruity, floral scent to products but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenethyl 2-Methylbutyrate

PHENETHYL 2-METHYLBUTYRATE

3.5

A synthetic fragrance ester that adds a floral, honey-like scent; generally safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Phenethyl Acetate

PHENETHYL ACETATE

3.8

Phenethyl acetate is a pleasant-smelling fragrance ingredient found naturally in many flowers and fruits, generally considered safe at the low levels used in cosmetics.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance Ingredient

Phenethyl Alcohol

PHENETHYL ALCOHOL

4.0

A gentle, rose-scented alcohol that adds fragrance and helps preserve formulas without the drying effects of denatured alcohol.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance Ingredient

Phenethyl Anthranilate

PHENETHYL ANTHRANILATE

3.5

Phenethyl anthranilate is a synthetic fragrance ingredient with mild UV-absorbing properties, generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin Conditioning

Phenethyl Benzoate

PHENETHYL BENZOATE

4.0

Phenethyl benzoate is a gentle synthetic ester that helps condition skin and carry fragrance, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenethyl Butyrate

PHENETHYL BUTYRATE

3.5

Phenethyl Butyrate is a synthetic fragrance ingredient that adds a pleasant floral or fruity 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

Phenethyl Cinnamate

PHENETHYL CINNAMATE

3.5

Phenethyl Cinnamate is a gentle, naturally derived fragrance ingredient with some antioxidant potential, but its benefits in skincare are not yet well-established.

Irritation

low

Source

natural

beautyskincarefragrance
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Fragrance Ingredient

Phenethyl Formate

PHENETHYL FORMATE

3.5

Phenethyl Formate is a synthetic fragrance ingredient that adds a floral, rose-like scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Phenethyl Isovalerate

PHENETHYL ISOVALERATE

4.0

Phenethyl Isovalerate is a synthetic fragrance ingredient that adds a pleasant floral-honey note to products, with a low risk of irritation for most people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenethyl Methyl Ethyl Carbinyl Acetate

PHENETHYL METHYL ETHYL CARBINYL ACETATE

3.5

A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefit and may be unnecessary for sensitive noses.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenethyl Phenylacetate

PHENETHYL PHENYLACETATE

3.5

Phenethyl Phenylacetate is a synthetic fragrance ingredient that adds a sweet, floral scent to products but offers no direct skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenethyl Pivalate

PHENETHYL PIVALATE

3.8

A synthetic ester that adds a mild floral scent and light emollient feel, generally considered safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenethyl Propionate

PHENETHYL PROPIONATE

3.5

Phenethyl Propionate is a synthetic fragrance ingredient that adds a sweet, floral scent to products, but it offers no skin benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenethyl Salicylate

PHENETHYL SALICYLATE

4.0

Phenethyl Salicylate is a gentle synthetic ingredient that adds a pleasant floral scent and offers mild UV protection, but it is not a primary sunscreen agent.

Irritation

low

Source

synthetic

beautyskincarefragranceuv-absorber
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Fragrance Ingredient

Phenethyl Tiglate

PHENETHYL TIGLATE

3.5

Phenethyl Tiglate is a synthetic fragrance ingredient that adds a floral, rosy scent to products, 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

Phenoxyacetaldehyde

PHENOXYACETALDEHYDE

3.5

Phenoxyacetaldehyde is a synthetic fragrance compound that adds a floral scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenoxyethyl Isobutyrate

PHENOXYETHYL ISOBUTYRATE

3.5

Phenoxyethyl isobutyrate is a synthetic fragrance ingredient with low irritation potential, but it offers no skincare benefits beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenyl Benzoate

PHENYL BENZOATE

3.5

Phenyl benzoate is a synthetic fragrance ingredient that adds scent to products but may cause irritation in sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenylacetaldehyde

PHENYLACETALDEHYDE

3.5

Phenylacetaldehyde adds a floral, hyacinth-like scent to products but can be a skin sensitizer for some individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Phenylacetaldehyde Diethyl Acetal

PHENYLACETALDEHYDE DIETHYL ACETAL

3.8

A synthetic floral scent ingredient that can be a skin sensitizer for some people, especially at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review