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

Antioxidant

Allspice Fruit Extract

Pimenta Dioica Fruit Extract

3.8

A gentle botanical extract with antioxidant and soothing potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Exfoliant

Alluvial Mud

Alluvial Mud

3.5

Alluvial mud is a gentle, mineral-rich sediment that can help absorb excess oil and lightly exfoliate skin, but its benefits are mostly anecdotal.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Fragrance Ingredient

Allyl 2-Methylbutoxyacetate

ALLYL 2-METHYLBUTOXYACETATE

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

Allyl 3,5-Dimethylcyclohexanol

ALLYL 3,5-DIMETHYLCYCLOHEXANOL

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

Allyl Butyrate

ALLYL BUTYRATE

3.5

Allyl Butyrate is a synthetic fragrance ingredient that adds a fruity, pineapple-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

Allyl Caproate

ALLYL CAPROATE

3.5

Allyl Caproate is a synthetic fragrance ingredient that adds a fruity, pineapple-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

Allyl Cinnamate

ALLYL CINNAMATE

3.5

Allyl Cinnamate is a synthetic fragrance ingredient that adds a sweet, balsamic scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Allyl Cyclohexylacetate

ALLYL CYCLOHEXYLACETATE

3.5

A synthetic scent ingredient that adds a fruity note to products; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Allyl Cyclohexyloxyacetate

ALLYL CYCLOHEXYLOXYACETATE

3.5

A synthetic fragrance ingredient that adds a fruity scent 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

Allyl Cyclohexylpropionate

ALLYL CYCLOHEXYLPROPIONATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Allyl Heptanoate

ALLYL HEPTANOATE

3.5

Allyl heptanoate is a synthetic fragrance ingredient that adds a fruity, pineapple-like 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

Allyl Heptine Carbonate

ALLYL HEPTINE CARBONATE

3.5

A synthetic fragrance compound that adds a violet note to products but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Allyl Isovalerate

ALLYL ISOVALERATE

3.5

Allyl Isovalerate is a synthetic fragrance ingredient that adds a fruity, apple-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

Allyl Nonanoate

ALLYL NONANOATE

3.5

Allyl Nonanoate is a synthetic fragrance ingredient that adds a fruity, pineapple-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

Allyl Octanoate

ALLYL OCTANOATE

3.5

A synthetic fragrance ester that adds a fruity scent to products but offers no skin benefit and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Allyl Phenethyl Ether

ALLYL PHENETHYL ETHER

3.5

Allyl phenethyl ether is a synthetic fragrance compound that adds a sweet floral note to products, but it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Allyl Phenoxyacetate

ALLYL PHENOXYACETATE

3.5

Allyl phenoxyacetate is a synthetic fragrance ingredient that adds a sweet, fruity note 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

Allyl Phenylacetate

ALLYL PHENYLACETATE

3.5

Allyl Phenylacetate is a synthetic fragrance compound that adds a sweet, honey-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

Allyl Propionate

ALLYL PROPIONATE

3.5

Allyl Propionate is a synthetic fragrance ingredient that adds a fruity note to products; it is generally considered safe at low concentrations but offers no skin benefit beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Film Former

Allyl Stearate/VA Copolymer

Allyl Stearate/Vinyl Acetate Copolymer

3.5

A synthetic film-former that helps makeup and sunscreen stay put longer, especially in water or sweat.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Fragrance

Allyl Trimethylhexanoate

ALLYL TRIMETHYLHEXANOATE

3.5

Allyl Trimethylhexanoate is a synthetic fragrance ingredient that adds a fruity, floral scent to products, but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Allylanisole

ALLYLANISOLE

3.5

Allylanisole adds a sweet, licorice-like scent to products but can be a skin sensitizer for some people.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Allyldimethoxyphenetole

ALLYLDIMETHOXYPHENETOLE

3.5

A synthetic fragrance ingredient that adds a warm, spicy scent but may cause irritation or allergic reactions in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin conditioning agent

Almond Kernel Extract

Prunus Amygdalus Dulcis (Sweet Almond) Kernel Extract

4.0

Almond Kernel Extract is a gentle, plant-based ingredient that helps soothe and condition the skin, making it a good fit for sensitive and dry skin types.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Emollient

Almond Oil Glycereth-8 Esters

ALMOND OIL GLYCERETH-8 ESTERS

4.0

A gentle, semi-synthetic ingredient that combines the moisturizing benefits of almond oil with improved water solubility for stable, non-greasy formulas.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
Read ingredient review

Emollient

Almond Oil PEG-6 Esters

ALMOND OIL PEG-6 ESTERS

4.0

A gentle, semi-synthetic emollient that helps products spread smoothly and leaves skin feeling soft without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Almond Oil PEG-8 Esters

ALMOND OIL PEG-8 ESTERS

4.0

A gentle, PEG-modified almond oil that helps products spread smoothly and feel silky without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Exfoliant

Almond Seedcoat Powder

Prunus Amygdalus Dulcis Seedcoat Powder

4.0

A gentle, natural exfoliant that buffs away dead skin cells without harsh microplastics, but may feel too gritty for sensitive skin.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Surfactant

Almondamide DEA

Almondamide DEA

3.5

Almondamide DEA helps create rich lather and thicker textures, but it is a semi-synthetic ingredient with moderate irritation potential for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Antistatic Agent

Almondamidopropalkonium Chloride

Almondamidopropalkonium Chloride

3.5

A gentle conditioning agent derived from almond oil that helps reduce static and improve manageability, but may cause mild irritation in sensitive individuals.

Irritation

moderate

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Surfactant

Almondamidopropyl Betaine

Almondamidopropyl Betaine

4.0

A gentle, almond-derived surfactant that cleanses without stripping the skin, making it a solid choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Almondamidopropylamine Oxide

ALMONDAMIDOPROPYLAMINE OXIDE

4.0

A gentle, almond-derived surfactant that helps create a rich lather without stripping the skin, making it a good choice for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Antioxidant

Alnus Firmifolia Fruit Extract

Alnus Firmifolia Fruit Extract

3.8

A gentle antioxidant extract from alder fruit that may help protect skin from environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Aloe Arborescens Leaf Powder

Aloe Arborescens Leaf Powder

4.0

A gentle, plant-based powder that soothes and hydrates skin, similar to Aloe vera but with a slightly different nutrient profile.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Soothing Agent

Aloe Callus Culture Extract

Aloe Barbadensis Callus Culture Extract

4.3

A sustainable, lab-grown aloe extract that soothes skin and fights free radicals without the variability of traditional aloe.

Irritation

low

Source

biotech

beautyskincaresoothing
Read ingredient review

Antioxidant

Aloe Callus Extract

Aloe Barbadensis Callus Extract

4.0

A lab-grown aloe extract that offers concentrated antioxidants and soothing benefits with minimal irritation risk.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Soothing Agent

Aloe Callus Powder

Aloe Barbadensis Callus Powder

4.0

A gentle, plant-based powder that soothes and protects skin, but its benefits are less studied than traditional aloe leaf juice.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Soothing Agent

Aloe Ferment Filtrate

LACTOBACILLUS/ALOE BARBADENSIS FERMENT FILTRATE

4.0

A gentle, probiotic-fermented aloe ingredient that soothes and conditions skin without irritation.

Irritation

low

Source

biotech

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Aloe Fermented Pine Extract

Aloe Arborescens Leaf Extract, Pinus Densiflora Leaf Extract, Saccharomyces Ferment

3.8

A gentle fermented botanical blend that may help calm skin and provide antioxidant support, though research is limited.

Irritation

low

Source

natural

beautyskincareantioxidantsoothing
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Humectant

Aloe Ferox Leaf Juice

Aloe Ferox Leaf Juice

4.0

Aloe Ferox Leaf Juice is a gentle, hydrating ingredient that soothes and moisturizes skin, with a slightly richer nutrient profile than common Aloe Vera.

Irritation

low

Source

natural

beautyskincarehumectant
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Soothing Agent

Aloe Ferox Leaf Juice Extract

Aloe Ferox Leaf Juice Extract

4.0

A soothing, hydrating botanical extract with antioxidant benefits, generally safe and well-tolerated for most skin types.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Aloe Ferox Leaf Juice Powder

Aloe Ferox Leaf Juice Powder

4.0

A gentle, plant-derived powder that helps calm and hydrate skin, but is less studied than its cousin Aloe barbadensis (common aloe vera).

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Aloe Maculata Leaf Extract

Aloe Maculata Leaf Extract

3.8

Aloe Maculata Leaf Extract is a gentle, soothing botanical that helps calm irritated skin and provides light hydration, but it is less researched than classic Aloe vera.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Aloe Phytoplacenta Extract

Aloe Barbadensis Phytoplacenta Extract

4.0

A gentle, plant-derived ingredient that may help calm irritation and support skin's natural repair processes, though human studies are limited.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Humectant

Aloe Polysaccharides

Aloe Barbadensis Leaf Polysaccharides

4.3

Aloe polysaccharides are gentle, hydrating molecules that help calm irritation and support the skin's moisture barrier.

Irritation

low

Source

natural

beautyskincarehumectant
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Soothing Agent

Aloe Resin Extract

Aloe Species Resin

3.8

Aloe resin is a natural, soothing ingredient that may help calm irritated skin, but research on its specific benefits is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Aloe Sprout Extract

Aloe Barbadensis Sprout Extract

4.0

Aloe sprout extract is a gentle, antioxidant-rich ingredient that hydrates and soothes skin, but research on its specific benefits is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Soothing Agent

Aloe Vera

Aloe Barbadensis Leaf Juice

4.5

Aloe vera is a gentle, hydrating ingredient that can help calm irritated skin, but its benefits are often overstated in marketing.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Soothing Agent

Aloe Vera Callus Extract

Aloe Barbadensis Callus Extract

4.0

A gentle, lab-grown aloe extract that soothes and hydrates without the variability of traditional aloe.

Irritation

low

Source

biotech

beautyskincaresoothing
Read ingredient review

Humectant

Aloe Vera Leaf Extract

Aloe Barbadensis Leaf Extract

4.5

Aloe vera leaf extract is a gentle, water-based humectant that hydrates and soothes the skin, making it a staple in calming and moisturizing products.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Soothing Agent

Aloe Vera Leaf Juice Powder

Aloe Barbadensis Leaf Juice Powder

4.5

A gentle, water-soluble powder that soothes and hydrates skin, ideal for sensitive or irritated complexions.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Aloe Vera Leaf Powder

Aloe Barbadensis Leaf Powder

4.0

A gentle, plant-based powder that soothes and hydrates skin, but its benefits depend heavily on processing and formulation.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Skin brightener

Aloesin

ALOESIN

4.0

Aloesin is a gentle, plant-derived brightener that can help fade dark spots without the irritation of stronger alternatives.

Irritation

low

Source

natural

beautyskincarebrightening
Read ingredient review

Exfoliant

Alpha Hydroxy Acid (AHA) Blend

Alpha-Hydroxy Acids

4.2

Alpha hydroxy acids are effective exfoliants that smooth skin texture and boost radiance, but require careful use to avoid irritation.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review