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

Anti-wrinkle agent

Butylbenzamido Methylhydroxybenzamide

T-BUTYLBENZAMIDO METHYLHYDROXYLBENZAMIDE

3.8

A synthetic ingredient that aims to relax facial muscles and soften expression lines, offering a non-invasive alternative to injectables.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

UV Filter

Butylbenzotriazole Siloxane

Bis(Butylbenzoate) Diaminotriazine Aminopropyltrisiloxane

4.0

A modern synthetic UV filter that provides broad-spectrum protection with low irritation potential, but its safety data is still emerging compared to older filters.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

Cooling Agent

Butylcyclohexanol

CIS-2-TERT-BUTYLCYCLOHEXANOL

3.8

A synthetic cooling agent that creates a refreshing sensation on skin, commonly used in products for a 'cooling' feel without actual temperature change.

Irritation

low

Source

synthetic

beautyskincaresensory modifier
Read ingredient review

Solvent

Butylene Carbonate

Butylene Carbonate

3.5

Butylene carbonate is a synthetic solvent that helps dissolve other ingredients and adjust product feel, but it offers no direct skin benefit and is rarely used in leave-on skincare.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Humectant

Butylene Glycol

Butylene Glycol

4.2

A widely used, low-irritation humectant that helps products feel smooth and hydrating without being sticky.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Emollient

Butylene Glycol Behenate

Butylene Glycol Behenate

4.0

A gentle synthetic emollient that helps creams feel silky and spread easily without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butylene Glycol Cocoate

Butylene Glycol Cocoate

4.0

A gentle, coconut-derived emollient that softens skin without clogging pores, ideal for sensitive and dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butylene Glycol Diisononanoate

Butylene Glycol Diisononanoate

4.0

A lightweight synthetic emollient that softens skin without clogging pores, ideal for oil-free and non-greasy formulas.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butylene Glycol Isostearate

Butylene Glycol Isostearate

3.8

A synthetic emollient that softens skin and helps products spread smoothly, but may clog pores for some people.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butylene Glycol Laurate

Butylene Glycol Laurate

4.0

A gentle, lightweight emollient that helps soften skin and improve product texture without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butylene Glycol Montanate

Butylene Glycol Montanate

4.0

A gentle wax ester that helps thicken and stabilize creams and lip products without common irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butylene Glycol Palmitate

Butylene Glycol Palmitate

4.0

A gentle synthetic emollient that helps soften skin and improve product texture without common irritation or clogging concerns.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Solvent

Butylene Glycol Propionate

Butylene Glycol Propionate

3.5

A gentle synthetic ester that helps other ingredients spread smoothly, but offers little direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Surfactant

Butylglucoside Caprate

Butylglucoside Caprate

4.3

A gentle, biodegradable surfactant that cleanses effectively while being kind to sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Humectant

Butylglycerin

Butylglycerin

4.0

Butylglycerin is a gentle, synthetic humectant that pulls moisture into the skin and improves product feel without common irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Soothing Agent

Butylidenephthalide

Butylidenephthalide

3.5

A plant-derived compound with promising anti-inflammatory and antioxidant potential, but research in topical cosmetics is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Emollient

Butyloctanoic Acid

Butyloctanoic Acid

4.0

A lightweight, non-greasy emollient that helps soften skin without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Solvent

Butyloctanol

Butyloctanol

4.0

A lightweight, non-greasy fatty alcohol that helps dissolve other ingredients and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Beeswax

Butyloctyl Beeswax

4.0

A gentle, semi-synthetic wax that improves product texture and stability without common beeswax drawbacks.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Behenate

Butyloctyl Behenate

4.2

A lightweight, non-greasy emollient that makes products feel silky and spread smoothly, with a very low risk of irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Benzoate

Butyloctyl Benzoate

4.0

A lightweight, synthetic emollient that improves product texture and spreadability without clogging pores or feeling heavy.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Candelillate

Butyloctyl Candelillate

4.0

A gentle, plant-based wax ester that gives products a smooth, non-greasy feel and helps stabilize formulas.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Cetearyl Ether

Butyloctyl Cetearyl Ether

4.0

A lightweight, non-greasy emollient that helps products glide on and leaves skin feeling soft without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Oleate

Butyloctyl Oleate

4.0

A lightweight, non-greasy emollient that improves product feel and skin softness with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Palmitate

Butyloctyl Palmitate

4.0

A lightweight, non-greasy emollient that spreads easily and is generally well-tolerated, making it a common choice for moisturizers and sunscreens.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emollient

Butyloctyl Salicylate

Butyloctyl Salicylate

4.0

A safe, lightweight emollient that helps sunscreens feel silky and spread easily, but it's not an active sunscreen ingredient itself.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

Fragrance Ingredient

Butyloxepanone

Butyloxepanone

3.5

Butyloxepanone is a synthetic fragrance ingredient that adds scent but offers no skincare benefits; it's generally safe at low levels but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Preservative

Butylparaben

Butylparaben

3.5

Butylparaben is an effective preservative but has raised some safety concerns, leading to restricted use in certain regions.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Skin conditioning agent

Butylphenyl Ethyl Glyceryl Diether

T-BUTYLPHENYL ETHYL GLYCERYL DIETHER

3.8

A synthetic ingredient that helps products feel silky and spread smoothly, with a good safety profile for most skin types.

Irritation

low

Source

synthetic

beautyskincareconditioning agent
Read ingredient review

Skin conditioning agent

Butylphenyl Glyceryl Ether

T-BUTYLPHENYL GLYCERYL ETHER

3.5

A synthetic ingredient that helps products feel smooth and silky, but it's not a star performer and is best understood as a texture helper.

Irritation

low

Source

synthetic

beautyskincareskin conditioning agent
Read ingredient review

Skin brightening agent

Butylphenyl Imidazolylphenyl Sulfonamide

T-BUTYLPHENYL IMIDAZOLYLPHENYL SULFONAMIDE

3.8

A synthetic brightener that works by blocking a key enzyme in melanin production, but it's less common than alternatives like vitamin C or niacinamide.

Irritation

low

Source

synthetic

beautyskincarebrightening agent
Read ingredient review

Antioxidant

Butylphthalide

Butylphthalide

3.5

Butylphthalide is a natural antioxidant from celery seed that may help calm skin and fight free radicals, but research in cosmetics is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Plasticizer

Butylphthalimide

Butylphthalimide

3.0

Butylphthalimide is a synthetic plasticizer that helps nail products stay flexible and resist chipping, but it has limited safety data and is best used in well-ventilated spaces.

Irritation

low

Source

synthetic

beautynail careplasticizer
Read ingredient review

Fragrance Ingredient

Butylquinoline

Butylquinoline

3.5

Butylquinoline is a synthetic fragrance ingredient that adds a distinctive leathery scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin-lightening agent

Butylresorcinol

4-Butylresorcinol

4.0

A potent synthetic brightener that can fade dark spots but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareskin-lightening
Read ingredient review

Fragrance Ingredient

Butyraldehyde

Butyraldehyde

2.5

Butyraldehyde is a synthetic fragrance compound that adds a distinctive scent but can be a skin irritant for sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin conditioning agent

Butyric Acid

Butyric Acid

3.8

Butyric acid is an emerging skincare ingredient that may support a healthy skin microbiome, but research is still early and it can be irritating at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarehumectant
Read ingredient review

Solvent

Butyrolactone

Butyrolactone

3.0

Butyrolactone is a synthetic solvent used mainly in nail products, but it has limited skincare benefits and may cause irritation at higher levels.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Fragrance Ingredient

Butyrolactone Thiol

Butyrolactone Thiol

3.5

Butyrolactone Thiol is a synthetic fragrance ingredient with limited safety data; it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Butyrophenone

Butyrophenone

2.5

Butyrophenone is a synthetic fragrance ingredient with limited safety data; it may cause skin irritation in sensitive individuals and is best avoided in leave-on products for reactive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Anti-aging

Butyroyl Pentapeptide-24

Butyroyl Pentapeptide-24

4.0

A lab-made peptide that encourages collagen production, making it a gentle anti-aging option for most skin types.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Emollient

Butyrum

Butyrum

4.0

Butyrum is a natural butter that softens and protects skin, but its comedogenic potential depends on the specific plant source.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review