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

Fragrance Component

Fragrance Allergen Blend

F.I.L. c52879/1

3.0

This is a regulatory marker for fragrance allergens, not a single ingredient; it signals potential sensitizers in scented products.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Component

Fragrance Allergen Complex

F.I.L. b4885/3

2.5

A regulatory code for a mix of fragrance allergens that may cause skin reactions in sensitive individuals.

Irritation

moderate

Source

mixed

beautyskincarefragrance
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Fragrance Component

Fragrance Allergen Marker

F.I.L. b160303/5

2.0

This is a regulatory code for a fragrance allergen, not a standalone cosmetic ingredient—it signals potential sensitization risk for sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance

Fragrance Blend

F.I.L. c170899/1

3.0

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

Irritation

moderate

Source

mixed

beautyskincarefragrance
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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
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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
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Soothing Agent

Fragrant Ginger Extract

Zingiber Aromaticus Extract

3.8

A gentle botanical extract with soothing and antioxidant potential, though research is still emerging compared to better-studied ginger relatives.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing Agent

Fragrant Solomon's Seal Rhizome Powder

Polygonatum Odoratum Rhizome Powder

3.8

A gentle botanical powder with traditional use in East Asian skincare, offering soothing and antioxidant benefits, though modern clinical evidence is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical
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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
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Soothing Agent

Frankincense Gum Water

Boswellia Carterii Gum Water

4.0

A gentle, water-based frankincense extract that may help calm redness and provide antioxidant protection without the oiliness of frankincense essential oil.

Irritation

low

Source

natural

beautyskincaresoothing agent
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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
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Soothing Agent

Frankincense Resin

Boswellia Frereana Resin

4.0

A gentle, natural resin extract that helps calm skin and fight free radical damage, but research on its cosmetic benefits is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Frankincress Resin Extract

Boswellia Papyrifera/Sacra/Serrata Resin Extract

4.0

A gentle, natural resin extract that helps calm irritation and provides antioxidant protection, but research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Freesia Extract

Freesia Armstrongii Extract

3.5

Freesia Extract is a gentle botanical with antioxidant potential, but research on its specific skincare benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Fragrance

Freesia Flower Extract

Freesia Alba Flower Extract

3.5

A gentle, fragrant flower extract that adds a light floral scent and mild antioxidant benefits to skincare, but lacks strong research on skin-specific effects.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

French Rose Flower Extract

Rosa Gallica Flower Extract

4.0

A gentle, antioxidant-rich botanical extract that can help soothe and protect the skin, though its benefits are modest compared to more potent active ingredients.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Fritillaria Bulb Extract

Fritillaria Verticillata Bulb Extract

3.5

A gentle botanical extract with antioxidant and soothing potential, but research is limited and mostly traditional.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing agent

Fritillaria Bulb Ferment Extract

CANDIDA ALBICANS/FRITILLARIA VERTICILLATA BULB FERMENT EXTRACT

3.8

A fermented botanical extract with potential soothing and antioxidant benefits, but research is limited and mostly based on traditional use.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Humectant

Fructan

Fructan

4.0

Fructan is a gentle, plant-derived humectant that helps hydrate skin and supports a balanced microbiome, making it a good choice for sensitive or reactive skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Fructose

Fructose

4.0

Fructose is a gentle, natural humectant that helps keep skin hydrated and smooth, but it's not as potent as glycerin or hyaluronic acid.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Fruit Extract Blend

Fruit Extract

3.8

A gentle, antioxidant-rich blend that can help protect skin from environmental stress, but its exact composition varies by product.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Fucose

Fucose

4.0

Fucose is a gentle sugar-derived ingredient that supports skin hydration and a healthy barrier, with promising early research for soothing and firming effects.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Fucosterol

Fucosterol

4.0

Fucosterol is a promising antioxidant from brown algae that may help protect skin from environmental stress, but human research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Fucosyllactose

Fucosyllactose

4.0

A gentle, microbiome-friendly sugar that helps hydrate and strengthen the skin barrier, inspired by a key component of breast milk.

Irritation

low

Source

biotech

beautyskincarehumectant
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Antioxidant

Fucoxanthin

Fucoxanthin

3.8

Fucoxanthin is a promising antioxidant from brown seaweed that may help protect skin from environmental damage and support a more even tone, though human studies are still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Fucus Crispus Thalle Oil

Fucus Crispus Thalle Oil

3.8

A gentle, seaweed-derived oil that helps soften and soothe the skin, but research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
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Absorbent

Fuller's Earth

Fuller's Earth

4.0

A classic clay that soaks up excess oil and impurities, ideal for oily and acne-prone skin when used in masks.

Irritation

low

Source

natural

beautyskincareabsorbent
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Antioxidant

Fulvic Acid

Fulvic Acid

3.8

Fulvic acid is a gentle antioxidant that may help protect skin from environmental stress and support a healthy-looking complexion, but research in topical skincare is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Fumaric Acid

FUMARIC ACID

3.8

Fumaric acid is a gentle alpha hydroxy acid (AHA) that exfoliates and brightens skin, but it can cause irritation at higher concentrations.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Film Former

Fumaric Acid Copolymer

FUMARIC ACID/PHTHALIC ANHYDRIDE/TRICYCLODECANEDIMETHANOL COPOLYMER

3.5

A synthetic film-former that helps products stay put, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Soothing Agent

Fumitory Extract

Fumaria Officinalis Extract

3.8

Fumitory extract is a gentle botanical with antioxidant and soothing potential, but human studies are limited and it is not a proven powerhouse ingredient.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Fumitory Leaf Extract

Fumaria Officinalis Leaf Extract

3.8

Fumitory leaf extract is a gentle botanical with antioxidant and soothing potential, but human research is limited and it is not a proven powerhouse ingredient.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Funeral Cypress Wood Extract

CUPRESSUS FUNEBRIS WOOD EXTRACT

3.8

A gentle botanical extract with antioxidant potential, but research is limited and it's mainly valued for its subtle woody scent.

Irritation

low

Source

natural

beautyskincareantioxidant
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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
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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
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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
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Emollient

Furfuryl Palmitate

Furfuryl Palmitate

3.8

A gentle emollient ester that softens skin with low irritation potential, but research on its long-term benefits is limited.

Irritation

low

Source

synthetic

beautyskincareemollient
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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
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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
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Exfoliant

Furoic Acid

Furoic Acid

3.5

Furoic acid is a gentle exfoliating acid with antioxidant potential, but research on its efficacy and safety in cosmetics is still limited.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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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
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Emollient

Fusanus Acuminatus Seed Oil

FUSANUS ACUMINATUS SEED OIL

4.0

A lightweight, non-greasy oil that hydrates and soothes skin, with a unique fatty acid profile that supports barrier function.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Fusanus Spicatus Kernel Oil

FUSANUS SPICATUS KERNEL OIL

4.3

A gentle, non-greasy oil that hydrates and soothes skin, suitable for most skin types including sensitive and oily.

Irritation

low

Source

natural

beautyskincaremoisturizer
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