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 4,092
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

Tasmannia Lanceolata Extract

Tasmannia Lanceolata Fruit/Leaf Extract

4.0

A gentle, antioxidant-rich botanical extract that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tasmannia Lanceolata Fruit Extract

Tasmannia Lanceolata Fruit Extract

4.0

A gentle, antioxidant-rich extract from Tasmanian pepperberry that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tasmannia Lanceolata Leaf Extract

Tasmannia Lanceolata Leaf Extract

4.0

A gentle, antioxidant-rich botanical extract that may help protect skin from environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Taurine

TAURINE

4.0

Taurine is a gentle antioxidant and hydrator that helps protect skin from environmental stress and supports moisture balance.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
Read ingredient review

Antioxidant

Taxamairin A

Taxamairin A

3.5

Taxamairin A is a plant-derived antioxidant with early research suggesting it may help protect skin from environmental stress, but it is not yet widely studied in cosmetics.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Taxamairin C

Taxamairin C

3.5

Taxamairin C is a rare plant antioxidant from yew trees with promising lab data, but human skin studies are still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Taxiresinol

TAXIRESINOL

3.8

Taxiresinol is a plant-derived antioxidant that may help calm skin and fight free radical damage, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Taxus Meristem Cell Culture Filtrate

TAXUS CUSPIDATA MERISTEM CELL CULTURE CONDITIONED MEDIA

3.8

A plant stem cell ingredient that may help protect skin from environmental stress, but human research is still limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Antioxidant

TBHQ

TERT-BUTYLHYDROQUINONE

3.5

TBHQ is a synthetic preservative that keeps oils fresh, but its safety is debated at higher concentrations.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

TBHQ Dimethyl Ether

TERT-BUTYLHYDROQUINONE DIMETHYLETHER

3.5

A synthetic antioxidant that helps keep your products fresh, but it's not a star ingredient for your skin.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

TBHQ Methyl Ether

2-TERT-BUTYLHYDROQUINONE METHYL ETHER

3.5

A synthetic antioxidant that helps keep oils and fats from going rancid, but it's not a star active for skin benefits.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tea & Ginseng Leaf-Root Extract

Camellia Sinensis Leaf / Panax Ginseng Root Extract

4.0

A gentle antioxidant duo from green tea and ginseng that helps protect skin from environmental stress and may support a calmer complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tea Sprout Extract

Camellia Sinensis Sprout Extract

4.0

A gentle, antioxidant-rich extract from young tea leaves that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

TEA-Phosphoadenosine Phosphosulfate

TEA-Phosphoadenosine Phosphosulfate

3.8

A promising but under-researched ingredient that may support skin repair and brightness by aiding sulfur-based processes in the skin.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tecoma Lapacho Bark Extract

Tecoma Lapacho Bark Extract

3.8

A gentle plant extract with antioxidant potential, but limited human studies to back its skincare claims.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Teff Seed Extract

Eragrostis Tef Seed Extract

3.8

Teff Seed Extract is a gentle, antioxidant-rich ingredient that may help protect skin from environmental stress and support hydration, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Telosma Cordata Flower Extract

Telosma Cordata Flower Extract

3.8

A gentle, fragrant flower extract with antioxidant potential, but research is limited and benefits are mostly theoretical.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Terminalia Chebula Fruit Oil

Terminalia Chebula Fruit Oil

4.0

A gentle, antioxidant-rich oil that helps protect skin from environmental stress and supports a healthy-looking complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Terminalia Chebula Root Extract

Terminalia Chebula Root Extract

4.0

A gentle, antioxidant-rich botanical extract that helps protect skin from environmental stress while supporting a calm, even-looking complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Terminalia Ferdinandiana Fruit Powder

Terminalia Ferdinandiana Fruit Powder

4.3

A potent natural antioxidant from Kakadu plum that helps brighten skin and fight environmental damage, but its vitamin C content can be unstable in water-based formulas.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Terminalia Sericea Extract

Terminalia Sericea Bark/Root Extract

3.8

A gentle, plant-based antioxidant extract that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Terpinolene

TERPINOLENE

3.5

Terpinolene is a natural antioxidant and fragrance ingredient, but its strong scent and moderate irritation potential mean it's best for those without sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragranceantioxidant
Read ingredient review

Antioxidant

Terrein

TERREIN

3.8

Terrein is a promising fungal-derived ingredient that may help brighten skin and fight oxidative stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrabena Algae Extract

Tetrabena Socialis Extract

3.8

A gentle algae extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrabutyl Ethylidenebisphenol

TETRABUTYL ETHYLIDENEBISPHENOL

3.5

Tetrabutyl Ethylidenebisphenol is a synthetic antioxidant that helps keep skincare products stable, but it is less studied than common alternatives like vitamin E.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetradesmus Obliquus Extract

Tetradesmus Obliquus Extract

4.0

A gentle algae extract that helps hydrate and protect skin from environmental stress, though research is still developing.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahexyldecyl Ascorbate

Tetrahexyldecyl Ascorbate

4.5

A gentle, stable vitamin C that penetrates skin well and brightens without the sting of L-ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahydrocurcumin Diacetate

TETRAHYDROCURCUMIN DIACETATE

4.0

A gentle, stabilized turmeric derivative that helps even skin tone and fights oxidative stress without the yellow staining of raw curcumin.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahydrodemethylcurcumin

Tetrahydrodemethylcurcumin

4.0

A stable, non-staining turmeric derivative that fights oxidative stress and helps even skin tone without the yellow tint of raw turmeric.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahydrodiferuloylmethane

Tetrahydrodiferuloylmethane

4.0

A gentle, stable antioxidant derived from turmeric that helps protect skin from environmental stress without the staining or irritation of raw curcumin.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahydromagnolol

Tetrahydromagnolol

4.0

A gentle antioxidant derived from magnolia bark that helps calm skin and fight free radical damage without common irritation.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahydropyranyloxy Phenol

TETRAHYDROPYRANYLOXY PHENOL

3.5

A synthetic antioxidant that may help protect skin from environmental stress, but research is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahydroxy Chalcone

Tetraacetoxychalcone

3.8

A synthetic antioxidant that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrahydroxybutyl Timonacic

Tetrahydroxybutyl Timonacic

3.8

A synthetic antioxidant that may help protect skin from environmental stress, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetramethyl Cyclopentene Butenol

TETRAMETHYL CYCLOPENTENE BUTENOL

4.0

A lab-made antioxidant that helps defend skin against pollution and UV-related damage, often found in anti-aging formulas.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetramethylbutyl Dihydroxybenzamide

TETRAMETHYLBUTYL DIHYDROXYBENZAMIDE

3.8

A synthetic antioxidant that helps shield skin from oxidative damage, but research is still limited compared to more established antioxidants.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetramethylchromanol Glucoside

Tetramethylchromanol Glucoside

4.0

A gentle, stabilized antioxidant that may help defend skin against pollution and UV damage without irritation.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetramethylpyrazine

TETRAMETHYLPYRAZINE

3.5

Tetramethylpyrazine is a gentle antioxidant from fermented sources that may help calm skin and support microcirculation, though human skincare studies are still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetrandrine

TETRANDRINE

3.5

Tetrandrine is a plant alkaloid with promising anti-inflammatory and antioxidant benefits, but research in topical skincare is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tetraselmis Chui Extract

Tetraselmis Chui Extract

4.0

A gentle, antioxidant-rich microalgae extract that helps soothe and protect the skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Teucrium Viscidum Extract

TEUCRIUM VISCIDUM LEAF/STEM EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Teupolioside

Teupolioside

3.8

Teupolioside is a gentle plant antioxidant that may help calm skin and defend against environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Texas Lupine Seed Extract

LUPINUS TEXENSIS SEED EXTRACT

3.8

A gentle, antioxidant-rich plant extract that may help soothe and protect skin, but research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Texas Sage Extract

Ettlia Texensis Extract

3.8

A gentle, algae-derived extract that may help protect skin from environmental stress and support hydration, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Thalassiosira Pseudonana Extract

THALASSIOSIRA PSEUDONANA EXTRACT

4.0

A gentle marine algae extract that helps hydrate skin and protect against environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
Read ingredient review

Flavoring Agent

Thaumatococcus Daniellii Fruit Extract

THAUMATOCOCCUS DANIELLII FRUIT EXTRACT

3.8

A natural sweetener and mild antioxidant from a West African fruit, used mainly for flavor in lip products rather than for skin benefits.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Theanine

Theanine

4.0

Theanine is a gentle, calming amino acid that helps soothe stressed skin and fight environmental damage.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Thenoyl Methionate

Thenoyl Methionate

3.5

A synthetic antioxidant that may help protect skin from environmental stress, but research is still limited compared to more established ingredients.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Theobromine

Theobromine

4.0

A gentle antioxidant from cacao that may help soothe skin and support a firmer appearance.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Thiamine Bis-Laurylsulfate

THIAMINE BIS-LAURYLSULFATE

3.5

A gentle, fat-soluble form of vitamin B1 that may help calm skin and support antioxidant defenses, though research in cosmetics is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Thiamine Diphosphate

Thiamine Diphosphate

3.8

A bioactive form of vitamin B1 that may help protect skin from oxidative stress and support a healthy-looking complexion, though research in topical skincare is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review