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

Trans-Trimethylundecadienol

TRANS-TRIMETHYLUNDECADIENOL

3.5

A synthetic scent ingredient that adds a warm, woody note to products, but offers no skincare benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Anti-aging agent

Transgenic Rice Oligopeptide-2

Transgenic Rice Rh-Oligopeptide-2

3.8

A biotech peptide from transgenic rice that may support collagen and skin firmness, but human research is still limited.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Transgenic Tobacco Oligopeptide-1

TRANSGENIC TOBACCO RH-OLIGOPEPTIDE-1

3.8

A biotech peptide from tobacco that may help reduce fine lines, but research is still limited compared to traditional peptides.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Film Former

Transglutaminase

Transglutaminase

3.8

Transglutaminase is a biotech enzyme that may help reinforce the skin's structure, but its benefits in cosmetics are still being explored.

Irritation

low

Source

biotech

beautyskincareenzyme
Read ingredient review

Astringent

Tree of Heaven Bark Extract

Ailanthus altissima bark extract

3.5

A botanical extract with traditional astringent uses, but limited modern research on its skincare benefits.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Tree Peony Callus Extract

PAEONIA SUFFRUTICOSA CALLUS EXTRACT

4.0

A gentle, antioxidant-rich plant extract from tree peony callus that may help calm skin and fight free radical damage, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Tree Peony Extract

Paeonia Suffruticosa Branch/Flower/Leaf Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tree Peony Phytoplacenta Extract

PAEONIA SUFFRUTICOSA PHYTOPLACENTA EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Tree Wormwood Herb Oil

ARTEMISIA ARBORESCENS HERB OIL

3.5

Tree Wormwood Herb Oil offers potential soothing and antimicrobial benefits, but its potency and lack of broad safety data mean it's best used in low concentrations and with caution.

Irritation

moderate

Source

natural

beautyskincareessential oil
Read ingredient review

Humectant

Trehalose

Trehalose

4.3

Trehalose is a gentle, natural humectant that pulls water into the skin and helps protect it from drying out, making it a great option for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Emollient

Trehalose Undecylenate

TREHALOSE UNDECYLENOATE

4.0

Trehalose undecylenate is a gentle, sugar-based ester that hydrates and softens skin with low irritation potential, though research on its long-term benefits is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Humectant

Tremella Mushroom Extract

TREMELLA FUCIFORMIS SPOROCARP EXTRACT

4.2

Tremella mushroom extract is a gentle, plant-based humectant that helps skin hold onto moisture, often compared to hyaluronic acid.

Irritation

low

Source

natural

beautyskincarehumectant
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Cell-communicating ingredient

Tretinoin

TRETINOIN

4.5

A powerful prescription retinoid that effectively treats acne and reduces signs of aging, but requires careful use due to high irritation potential.

Irritation

high

Source

synthetic

beautyskincareactive
Read ingredient review

Emollient

Tri-C12-13 Alkyl Citrate

TRI-C12-13 ALKYL CITRATE

4.0

A gentle, non-greasy emollient that improves skin feel and product spreadability without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Surfactant

Tri-C12-15 Pareth-10 Phosphate

TRI-C12-15 PARETH-10 PHOSPHATE

3.8

A mild synthetic emulsifier that helps blend oil and water in cleansers, generally well-tolerated but not a standout active ingredient.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Tri-C12-15 Pareth-2 Phosphate

TRI-C12-15 PARETH-2 PHOSPHATE

4.0

A mild synthetic emulsifier that helps blend oil and water in cleansers and lotions, generally well-tolerated by most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Tri-C12-15 Pareth-6 Phosphate

TRI-C12-15 PARETH-6 PHOSPHATE

3.8

An effective cleansing agent that helps remove dirt and oil, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Tri-C12-15 Pareth-8 Phosphate

TRI-C12-15 PARETH-8 PHOSPHATE

3.8

A mild synthetic surfactant that helps cleanse without stripping, but may cause irritation for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

Tri-C14-15 Alkyl Citrate

TRI-C14-15 ALKYL CITRATE

4.0

A gentle, non-greasy emollient that helps skincare products spread smoothly and leaves skin feeling soft without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Antioxidant

Tri-Herb Botanical Extract

JUNIPERUS COMMUNIS FRUIT/ROSMARINUS OFFICINALIS/SALVIA OFFICINALIS EXTRACT

4.0

A gentle botanical blend that helps protect skin from environmental stress while offering a mild herbal scent.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Tri-Herb Leaf Extract

Artemisia Princeps Leaf/Equisetum Arvense/Houttuynia Cordata Extract

4.0

A gentle botanical blend that may help calm irritation and protect skin from environmental stress, though research on the specific combination is limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tri-Herbal Lotus Extract

Nelumbo Nucifera Leaf Extract / Orostachys Japonica Extract / Saururus Chinensis Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Solvent

Triacetin

Triacetin

4.0

Triacetin is a gentle, low-risk solvent and skin conditioner often used to improve product texture and stability.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Cell-communicating ingredient

Triacetyl Retinoyl Phytosphingosine

Triacetyl Retinoyl Phytosphingosine

4.0

A gentle, next-generation retinoid alternative that pairs vitamin A activity with skin-identical lipid support, but clinical evidence is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareactive
Read ingredient review

Film Former

Triacontanyl PVP

Triacontanyl PVP

3.8

A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Film Former

Triacontene/VP Copolymer

TRIACONTENE/VP COPOLYMER

3.8

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Emollient

Triarachidin

Triarachidin

4.0

Triarachidin is a gentle, plant-based emollient that helps soften and smooth the skin with a low risk of irritation or clogged pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Tribehenin

TRIBEHENIN

4.0

Tribehenin is a gentle, plant-based emollient that helps soften skin and improve product texture without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emulsifier

Tribehenin PEG-20 Esters

TRIBEHENIN PEG-20 ESTERS

4.0

A gentle emulsifier that helps create smooth, stable creams and lotions with a silky feel.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Plasticizer

Tribenzoin

Tribenzoin

3.5

Tribenzoin is a synthetic film-former that helps makeup and nail products glide on smoothly and last longer, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

Tribenzoyl Triricinolein

Tribenzoyl Triricinolein

4.0

A gentle, castor-oil-derived emollient that helps cosmetics feel smooth and stay put without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Antioxidant

Tribulus Fruit Powder

TRIBULUS TERRESTRIS FRUIT POWDER

3.8

A plant-based antioxidant powder that may help calm skin and fight free radical damage, though research in topical use is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Tribulus Terrestris Extract

Tribulus Terrestris Fruit/Stem Extract

3.5

A plant extract with antioxidant potential, but limited research supports its topical benefits in skincare.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Plasticizer

Tributyl Citrate

TRIBUTYL CITRATE

3.5

A safe, low-irritation ingredient that helps formulas spread smoothly and keeps nail polish flexible, but offers no direct skin benefit.

Irritation

low

Source

semi-synthetic

beautyskincaresolvent
Read ingredient review

Emollient

Tributylcresylbutane

Tributylcresylbutane

3.5

A synthetic emollient that helps products feel silky and spread easily, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Abrasive

Tricalcium Phosphate

Tricalcium Phosphate

3.8

Tricalcium phosphate is a gentle mineral abrasive and opacifier, safe for most skin types but best suited for rinse-off or low-concentration leave-on formulas.

Irritation

low

Source

natural

beautyskincarecosmetic ingredient
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Emollient

Tricaprin

TRICAPRIN

4.0

Tricaprin is a gentle, non-greasy emollient that helps moisturize and condition the skin, making it a good choice for sensitive or oily skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Tricaprylin

Tricaprylin

4.3

Tricaprylin is a gentle, lightweight emollient that hydrates without clogging pores, making it a great choice for oily and acne-prone skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Tricaprylyl Citrate

Tricaprylyl Citrate

4.5

A silky, non-greasy emollient that hydrates and smooths skin without clogging pores, ideal for sensitive and oily skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Surfactant

Triceteareth-4 Phosphate

TRICETEARETH-4 PHOSPHATE

3.8

A mild synthetic emulsifier that helps mix water and oil in products without stripping the skin.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Triceteth-5 Phosphate

TRICETETH-5 PHOSPHATE

3.5

A synthetic emulsifier that helps mix oil and water, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Tricetyl Phosphate

Tricetyl Phosphate

4.0

A mild synthetic emulsifier that helps blend oil and water in creams and lotions, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Antistatic Agent

Tricetylmonium Chloride

Tricetylmonium Chloride

3.8

A gentle conditioning ingredient that reduces static and softens hair without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emollient

Trichilia Emetica Seed Butter

Trichilia Emetica Seed Butter

4.0

A rich, traditional African seed butter that deeply moisturizes without clogging pores, ideal for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Trichilia Roka Seed Butter

Trichilia Roka Seed Butter

4.0

A rich, plant-based butter that softens and hydrates skin without feeling overly greasy, with some antioxidant potential.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Trichloromethyl Phenyl Carbinyl Acetate

TRICHLOROMETHYL PHENYL CARBINYL ACETATE

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

Emollient

Trichodesma Zeylanicum Oil

TRICHODESMA ZEYLANICUM OIL

4.0

A gentle, fatty-acid-rich oil that hydrates and soothes without clogging pores—great for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincareemollient
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Skin Conditioning

Tricholoma Extract

Tricholoma Magnivelare Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review