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

Skin Conditioning Agent

PG-Palmitoylpalmitamide

PG-PALMOYLPALMAMIDE

3.5

A synthetic ingredient that helps condition skin and stabilize formulas, but research on its specific benefits is still limited.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Antioxidant

Phaseolus Trilobus Seed Extract

Phaseolus Trilobus Seed Extract

3.5

A gentle, plant-derived antioxidant extract with limited but promising research; best for soothing and protecting normal to dry skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Phebalium Nudum Extract

Phebalium Nudum Flower/Leaf Extract

3.5

A gentle, antioxidant-rich botanical extract from an Australian native plant, promising for soothing and protecting skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Phellinus Linteus Rice Ferment

Phellinus Linteus/Rice Ferment Extract

4.0

A fermented mushroom-rice blend that may help soothe and protect skin, though research is still emerging.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Phellodendron Bark Extract

Phellodendron Chinense Bark Extract

4.0

A gentle botanical extract that helps calm skin and fight free radical damage, best for those with sensitive or stressed skin.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Surfactant

Pheneth-6 Phosphate

PHENETH-6 PHOSPHATE

4.0

A gentle, phosphate-based surfactant that cleanses effectively while being kinder to sensitive skin than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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
Read ingredient review

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
Read ingredient review

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

Antioxidant

Phenethyl Caffeate

PHENETHYL CAFFEATE

4.0

A gentle antioxidant from propolis that helps protect skin from environmental stress and may support a calmer, more even complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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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
Read ingredient review

Antimicrobial

Phenethyl Crotonate

PHENETHYL CROTONATE

3.5

Phenethyl Crotonate is a gentle synthetic ingredient that may help control bacteria on skin, but research is limited and it's not a standalone acne solution.

Irritation

low

Source

synthetic

beautyskincareantimicrobial
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Emollient

Phenethyl Dimethicone

PHENETHYL DIMETHICONE

4.0

Phenethyl Dimethicone is a lightweight silicone that smooths skin, reduces tackiness, and helps products glide on without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Skin Conditioning Agent

Phenethyl Disiloxane

PHENETHYL DISILOXANE

4.0

A lightweight silicone that gives a silky, non-greasy feel and helps other ingredients spread smoothly on skin.

Irritation

low

Source

synthetic

beautyskincaresilicone
Read ingredient review

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

Antioxidant

Phenethyl Isothiocyanate

PHENETHYL ISOTHIOCYANATE

3.8

A plant-derived compound with promising antioxidant and antimicrobial benefits, but limited research in topical skincare and potential for skin irritation.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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

Film Former

Phenethyl Methacrylate

PHENETHYL METHACRYLATE

3.5

Phenethyl methacrylate is a synthetic film-forming ingredient used mainly in nail products; it can be a skin sensitizer for some people.

Irritation

moderate

Source

synthetic

beautynail carefilm former
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

Colorant

Phenolsulfonphthalein

Phenolsulfonphthalein

2.5

Phenolsulfonphthalein is a synthetic dye used in tiny amounts for color; it has no proven skincare benefits and is generally safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Film Former

Phenoxy PEG-2 Acrylate

PHENOXY PEG-2 ACRYLATE

3.5

A synthetic film-former that helps products like nail polish and mascara dry into a smooth, durable layer.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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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

Preservative Booster

Phenoxyacetic Acid

PHENOXYACETIC ACID

3.5

Phenoxyacetic acid is a synthetic ingredient used to boost preservative systems and adjust pH, but it is less common than alternatives like phenoxyethanol.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Preservative

Phenoxyethanol

Phenoxyethanol

4.0

Phenoxyethanol is a safe and effective preservative that keeps your products fresh and free from harmful bacteria.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Emollient

Phenoxyethyl Caprylate

Phenoxyethyl Caprylate

4.0

Phenoxyethyl Caprylate is a gentle, synthetic emollient that helps products feel silky and spread easily, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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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

Film Former

Phenoxyethyl Methacrylate

PHENOXYETHYL METHACRYLATE

3.5

A synthetic film-former mainly used in nail products; generally safe but can be a mild irritant for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarenail-care
Read ingredient review

Humectant

Phenoxyethyl PCA

PHENOXYETHYL PCA

3.8

A gentle humectant that pulls moisture into the skin and helps other ingredients work better, but it's not a star performer on its own.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Emollient

Phenoxyethyl Propionate

PHENOXYETHYL PROPIONATE

3.5

A gentle synthetic emollient that helps soften skin and improve product texture without common irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Preservative

Phenoxyethylparaben

PHENOXYETHYLPARABEN

2.0

Phenoxyethylparaben is a paraben preservative that is rarely used today because of consumer concerns and regulatory restrictions in some regions.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Preservative

Phenoxyisopropanol

PHENOXYISOPROPANOL

3.8

Phenoxyisopropanol is a less common synthetic preservative that helps keep products fresh, but it has limited safety data compared to alternatives like phenoxyethanol.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Preservative Booster

Phenoxypropanediol

Phenoxypropanediol

4.0

A gentle preservative booster and humectant that helps keep formulas fresh and hydrated without common irritation.

Irritation

low

Source

synthetic

beautyskincarepreservative
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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

Skin conditioner

Phenyl Dimethicone

Phenyl Dimethicone

4.0

A gentle silicone that gives skin a smooth, velvety finish without clogging pores.

Irritation

low

Source

synthetic

beautyskincaresilicone
Read ingredient review

Skin conditioner

Phenyl Methicone

Phenyl Methicone

4.0

A gentle silicone that adds slip and shine without clogging pores, making it a good option for most skin and hair types.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Phenyl Methiconol

Phenyl Methiconol

4.0

A gentle silicone that adds shine and slip to products without feeling heavy or clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Colorant

Phenyl Methyl Pyrazolone

PHENYL METHYL PYRAZOLONE

3.0

Phenyl Methyl Pyrazolone is a synthetic colorant used in some cosmetics, but its safety data is limited and it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review