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

Chelating Agent

TEA-Polyphosphate

TEA-Polyphosphate

4.0

TEA-Polyphosphate is a gentle chelating agent that helps preserve product freshness and enhances the performance of other ingredients.

Irritation

low

Source

synthetic

beautyskincarechelating agent
Read ingredient review

Film Former

TEA-Rosinate

TEA-Rosinate

3.5

TEA-Rosinate helps makeup and sunscreen stay put longer, but it may not suit those with very sensitive skin or allergies to rosin derivatives.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
Read ingredient review

Preservative

TEA-Sorbate

TEA-Sorbate

3.5

TEA-Sorbate is a gentle preservative that helps keep your products fresh, but it may cause mild irritation for very sensitive skin.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Surfactant

TEA-Stearate

TEA-Stearate

3.5

TEA-Stearate helps cleansers foam and creams stay smooth, but it may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

TEA-Tallate

TEA-TALLATE

3.5

TEA-Tallate helps cleansers foam and remove oil, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

TEA-Tridecylbenzenesulfonate

TEA-Tridecylbenzenesulfonate

3.5

An effective synthetic cleanser that can be drying or irritating for sensitive skin, but is generally safe in rinse-off formulas.

Irritation

moderate

Source

synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

TEA-Undecylenate

TEA-Undecylenate

3.8

An effective cleansing and antimicrobial agent, but may be drying for sensitive or dry skin types.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Skin conditioning agent

TEA-Undecylenoyl Hydrolyzed Collagen

TEA-Undecylenoyl Hydrolyzed Collagen

3.8

A gentle, semi-synthetic ingredient that helps condition skin and may offer mild antimicrobial support, but its collagen benefits are limited to surface-level hydration.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Antioxidant

Tecoma Curialis Bark Extract

Tecoma Curialis Bark Extract

3.8

A gentle bark extract with antioxidant potential, but research is limited and benefits are not yet well-established.

Irritation

low

Source

natural

beautyskincarebotanical extract
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

Emollient

Telfairia Pedata Oil

Telfairia pedata oil

4.0

A gentle, plant-based oil that hydrates and softens skin with a light feel, though research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Anti-aging agent

Telmesteine

Telmesteine

3.5

Telmesteine is a synthetic peptide-like ingredient that may help firm and smooth skin, but research is still emerging and it is not widely studied in humans.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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

Soothing Agent

Tenacibaculum Discolor Ferment Extract

Tenacibaculum Discolor Ferment Extract

3.8

A gentle, biotech-derived ingredient from marine bacteria that may help calm skin and fight oxidative stress, though research is still early.

Irritation

low

Source

biotech

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Teprenone

TEPRENONE

3.5

Teprenone is a synthetic ingredient that may help calm skin and support the skin barrier, but research in cosmetics is still emerging.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Fragrance ingredient

Tepyl Acetate

TEPYL ACETATE

3.5

Tepyl acetate is a synthetic scent ingredient that adds a fresh, herbal note to products, but it offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Terminalia Bellirica Fruit Oil

Terminalia Bellirica Fruit Oil

4.0

A gentle, antioxidant-rich oil that helps hydrate and protect the skin, with a low risk of irritation or clogged pores.

Irritation

low

Source

natural

beautyskincareemollient
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

Emollient

Terminalia Ferdinandiana Seed Oil

Terminalia ferdinandiana seed oil

4.0

A gentle, antioxidant-rich seed oil that moisturizes and protects skin, though research on its unique benefits is still emerging.

Irritation

low

Source

natural

beautyskincareemollient
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

Fragrance

Terpene Alcohol Acetates

Terpene Alcohols Acetates

3.5

Terpene alcohol acetates are natural fragrance compounds that add pleasant scents to products but may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Terpene Blend

METHYL-METHYLENE-OCTADIENE ALPHA-TERPINEOLS

3.5

A fragrant terpene blend that adds scent but may irritate sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Terpineol

TERPINEOL

3.5

Terpineol adds a pleasant floral scent to products but may cause irritation in sensitive skin, especially at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Terpineol Acetate

TERPINEOL ACETATE

3.5

Terpineol Acetate is a naturally derived fragrance ingredient that adds a pleasant floral scent but may cause irritation in sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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

Fragrance Ingredient

Terpinyl Formate

TERPINYL FORMATE

3.5

Terpinyl Formate is a synthetic fragrance ingredient with a pleasant floral-herbal scent; it is generally considered safe at low levels but offers no skincare benefits beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Terpinyl Isobutyrate

TERPINYL ISOBUTYRATE

3.5

Terpinyl Isobutyrate is a synthetic fragrance ingredient with a pleasant floral-herbal scent; it is generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Terpinyl Propionate

TERPINYL PROPIONATE

3.8

Terpinyl Propionate is a synthetic fragrance ester that adds a pleasant floral-herbal scent to products, but it offers no skincare benefits and may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
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

Fragrance Ingredient

Tert-Butyl Dimethyl Acetophenone

TERT-BUTYL DIMETHYL ACETOPHENONE

3.5

A synthetic floral scent that can cause irritation in sensitive skin; best avoided if you react to fragrance.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Tert-Butyl Isopent-2-Enthioate

TERT-BUTYL ISOPENT-2-ENTHIOATE

3.5

A synthetic fragrance compound with limited public data; generally considered safe at low concentrations but best for those who tolerate added fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Tert-Butyl Isopentanethioate

TERT-BUTYL ISOPENTANETHIOATE

3.0

A synthetic fragrance compound with limited safety data; best for those who tolerate added scents well.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Tert-Butylquinoline

TERT-BUTYLQUINOLINE

3.5

A synthetic scent ingredient that adds a unique woody note but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Humectant

Testicular Hydrolysate

TESTICULAR HYDROLYSATE

2.5

An unusual animal-derived ingredient with limited research; may offer hydration but raises ethical and safety questions.

Irritation

moderate

Source

natural

beautyskincarehumectant
Read ingredient review

Skin-conditioning agent

Tetraacetylphytosphingosine

Tetraacetylphytosphingosine

4.3

A gentle, lipid-like ingredient that supports the skin's natural barrier and helps lock in moisture.

Irritation

low

Source

semi-synthetic

beautyskincarebarrier-repair
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

Colorant

Tetrabromophenol Blue

Tetrabromophenol Blue

1.0

Tetrabromophenol Blue is a synthetic dye with no proven skincare benefits; its use in cosmetics is rare and primarily as a colorant.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
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

Anti-aging agent

Tetracarboxymethyl Dipeptide-12

Tetracarboxymethyl Dipeptide-12

3.8

A synthetic peptide that may help support skin firmness and reduce wrinkle depth, but human studies are limited.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Tetracarboxymethyl Lauroyl Dipeptide-12

Tetracarboxymethyl Lauroyl Dipeptide-12

4.0

A synthetic peptide that may help support collagen and improve skin firmness, but more human studies are needed to confirm its effectiveness.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Emollient

Tetradecane

TETRADECANE

3.8

Tetradecane is a lightweight, non-greasy emollient that helps products glide on smoothly without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tetradecene

TETRADECENE

3.5

Tetradecene is a lightweight synthetic emollient that helps products glide on smoothly without a greasy feel, but it offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tetradecyleicosanol

TETRADECYLEICOSANOL

4.0

A gentle, non-greasy emollient that helps soften and smooth the skin without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tetradecyleicosyl Stearate

Tetradecyleicosyl Stearate

4.0

A gentle, non-greasy emollient that helps moisturize and improve the feel of skincare products without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tetradecyloctadecanoic Acid

TETRADECYLOCTADECANOIC ACID

4.0

A gentle, synthetic fatty acid that softens and smooths skin with a very low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review