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

Fragrance Mix

F.I.L. c46984/1

2.5

A fragrance blend that adds scent but may cause irritation in sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Fragrance Mix (F.I.L. b173588/1)

F.I.L. b173588/1

3.0

This is a regulatory fragrance code, not a single ingredient—it signals a specific fragrance blend that may contain allergens, so sensitive skin should approach with caution.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Frankincense Gum Absolute

Boswellia Carterii Gum Absolute

4.0

A fragrant resin extract that may help calm skin and provide a pleasant scent, but can be irritating for sensitive skin at high concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Frankincense Oil

Boswellia Carterii Gum Oil

4.0

Frankincense oil adds a warm, woody scent and offers antioxidant benefits, but it can be irritating for sensitive skin if used at high concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Furaneol

5-ETHYL-3-HYDROXY-4-METHYLFURAN-2-ONE

3.5

A sweet-smelling fragrance compound found naturally in strawberries and other fruits; generally safe at low levels but offers no skincare benefit.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Furfural

Furfural

2.0

Furfural is a potential skin sensitizer and irritant; it is rarely used as a direct cosmetic ingredient and is more commonly a trace byproduct or manufacturing intermediate.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Furfuryl Mercaptan

Furfuryl Mercaptan

3.5

A potent aroma chemical used in tiny amounts to add a roasted, coffee-like scent; generally safe but can cause allergies in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Furfuryl Valerate

Furfuryl Valerate

3.5

Furfuryl Valerate is a synthetic fragrance ingredient that adds a sweet, fruity note to products, but it has limited published safety data and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Furfurylideneoctanal

2-Furfurylideneoctanal

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Furyl Methyl Ketone

2-Furyl Methyl Ketone

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Galbanum Gum

Ferula Galbaniflua Gum

3.8

Galbanum gum is a natural resin with a rich history in traditional medicine, but modern skincare evidence is limited to its soothing and aromatic potential.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Galbanum Resin Oil

Ferula Galbaniflua Resin Oil

3.8

Galbanum Resin Oil adds a unique green, woody scent to products but has limited research on direct skin benefits and may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Gamma-Decalactone

GAMMA-DECALACTONE

4.0

Gamma-Decalactone is a safe, fruity fragrance ingredient used at low levels in cosmetics, but it offers no skincare benefits beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Gamma-Heptalactone

GAMMA-HEPTALACTONE

3.5

Gamma-Heptalactone is a synthetic scent ingredient that adds a sweet, creamy note 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

Gamma-Methylbenzenehexanenitrile

GAMMA-METHYLBENZENEHEXANENITRILE

3.5

A synthetic scent ingredient that adds a fresh floral note but has limited published safety data beyond basic skin irritation tests.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Gamma-Methylcinnamyl Acetate

GAMMA-METHYLCINNAMYL ACETATE

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Gamma-Methyldecalactone

GAMMA-METHYLDECALACTONE

3.5

A synthetic fragrance ingredient that adds a creamy, peach-like scent to products, but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Gamma-Nonalactone

GAMMA-NONALACTONE

3.5

Gamma-Nonalactone is a synthetic scent ingredient that adds a sweet, coconut-like aroma to products; it is generally safe at low concentrations but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Gamma-Undecalactone

GAMMA-UNDECALACTONE

3.5

A synthetic peach-scented fragrance ingredient that adds a pleasant aroma but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Gamma-Undecenolactone

GAMMA-UNDECENOLACTONE

3.5

Gamma-Undecenolactone is a synthetic fragrance compound that adds a pleasant 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

Gardenia Florida Oil

Gardenia Florida Oil

3.5

Gardenia Florida Oil adds a lovely floral scent to products, but its skin benefits are not well-studied and it may cause irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geranial

GERANIAL

3.5

Geranial adds a fresh lemon scent to products but can be a skin sensitizer, especially at higher concentrations or on sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geranic Acid

Geranic Acid

3.5

Geranic acid is a natural fragrance compound with some antimicrobial potential, but its use is limited by a moderate risk of skin irritation.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geraniol

Geraniol

3.8

Geraniol adds a natural rose scent to products but can be a skin sensitizer for some people, especially at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geranium Essential Oil

PELARGONIUM GRAVEOLENS STEM LEAF OIL

4.0

A fragrant botanical oil that may help balance oily and dry skin, but can be irritating for sensitive skin types.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geranium Flower Oil

PELARGONIUM GRAVEOLENS FLOWER OIL

3.8

Geranium flower oil adds a floral scent and may offer mild antioxidant benefits, but it can be irritating for sensitive skin due to its fragrance components.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geranium Macrorrhizum Oil

GERANIUM MACRORRHIZUM FLOWER/LEAF/STEM OIL

3.8

A fragrant geranium oil with mild astringent benefits, but its strong scent and potential for irritation mean it's best for those without sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geranyl Acetate

GERANYL ACETATE

3.5

Geranyl acetate is a natural floral fragrance ingredient that can cause skin sensitization in some individuals, especially at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Acetoacetate

Geranyl Acetoacetate

3.5

Geranyl Acetoacetate is a synthetic fragrance ingredient that adds a pleasant scent to products but offers no skincare benefits on its own.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Benzoate

Geranyl Benzoate

3.8

Geranyl Benzoate is a synthetic fragrance ingredient that adds a floral, rose-like scent to products; it is generally well-tolerated but may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Butyrate

Geranyl Butyrate

3.8

Geranyl Butyrate adds a pleasant floral scent to products but can be a skin sensitizer for some people, especially those with fragrance allergies.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Crotonate

Geranyl Crotonate

3.5

Geranyl Crotonate is a synthetic fragrance ingredient that adds a pleasant scent to products but offers no direct skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Geranyl Ethyl Ether

GERANYL ETHYL ETHER

3.5

A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Geranyl Formate

Geranyl Formate

3.5

Geranyl formate is a natural fragrance ester that adds a pleasant rose-like scent, but it can be a potential skin sensitizer for some individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Geranyl Hexanoate

Geranyl Hexanoate

3.5

Geranyl Hexanoate is a synthetic floral fragrance ingredient that is generally well-tolerated but offers no direct skin benefit beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Geranyl Isobutyrate

GERANYL ISOBUTYRATE

3.5

Geranyl isobutyrate is a synthetic fragrance ingredient that adds a pleasant floral scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Isovalerate

Geranyl Isovalerate

3.8

A gentle floral-herbal fragrance ingredient that adds a pleasant scent to products but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Linalool

Geranyl Linalool

3.5

Geranyl Linalool is a natural fragrance compound that adds a pleasant floral-woody scent but may cause skin sensitivity in some people.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Phenylacetate

Geranyl Phenylacetate

3.8

A floral-scented synthetic ester used to add a pleasant rose-honey note to products; generally safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyl Propionate

GERANYL PROPIONATE

3.5

Geranyl propionate is a synthetic fragrance ester that adds a floral, rose-like 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

Geranyl Tiglate

GERANYL TIGLATE

3.5

Geranyl Tiglate is a natural fragrance ester that adds a pleasant floral-herbal scent, but it offers no direct skincare benefits and may cause sensitivity in those allergic to fragrance ingredients.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Geranyloxyacetaldehyde

GERANYLOXYACETALDEHYDE

3.5

A synthetic fragrance ingredient that adds a fresh floral-green note but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Geranyloxycoumarin

4-METHYL-7-GERANYLOXYCOUMARIN

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Film Former

Glyceryl Abietate

Glyceryl Abietate

3.8

A natural resin derivative that helps fragrances last longer and creates a flexible film on skin or hair.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Grapefruit Peel Oil

CITRUS PARADISI M. PEEL OIL EXPRESSED

3.8

Grapefruit Peel Oil adds a fresh citrus scent to products but can be irritating for sensitive skin and may increase sun sensitivity.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Grass-Hay Herb Oil

Grass-Hay Herb Oil

3.8

A natural, fragrant oil that adds a subtle herbal scent and mild conditioning to skincare, but may irritate sensitive skin due to its aromatic compounds.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Guaiacol Acetate

Guaiacol Acetate

3.5

Guaiacol Acetate is a synthetic fragrance ingredient that adds a sweet, smoky, or vanilla-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 Ingredient

Guaiacol Phenylacetate

GUAIACOL PHENYLACETATE

3.5

Guaiacol Phenylacetate is primarily a fragrance ingredient with a low irritation risk, but it offers no direct skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Guaiacwood Oil

Guaiacum Sanctum Gum Oil

4.0

Guaiacwood oil offers antioxidant and soothing benefits with a warm, woody scent, but is primarily used as a fragrance component.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review