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 270
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

Colorant

CI 73915

CI 73915

4.0

CI 73915 is a safe, widely used red pigment that gives makeup its color without known skin irritation or clogging.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 74100

CI 74100

3.0

CI 74100 is a safe, widely used synthetic green pigment in color cosmetics, but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 74160

CI 74160

3.5

A widely used blue pigment that is generally safe for cosmetic use, but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 74180

CI 74180

3.5

CI 74180 is a safe, widely used synthetic dye that adds red color to cosmetics, but it offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 74260

CI 74260

3.5

A safe, widely used synthetic green pigment that adds color to makeup but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 75100

CI 75100

3.5

CI 75100 is a natural colorant that adds warm yellow-orange tones to cosmetics, but it offers no skincare benefits and may cause allergic reactions in sensitive individuals.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

CI 75125

CI 75125

3.5

A widely used synthetic yellow pigment that adds color to makeup but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 75135

CI 75135

3.5

CI 75135 is a widely used synthetic red pigment that adds vibrant color to makeup with a good safety profile for most people.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 75170

CI 75170

3.8

CI 75170 is a safe, natural pearlescent pigment that adds shimmer to makeup but offers no skincare benefits.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

CI 77220

CI 77220

4.5

A safe, widely used red pigment that gives color to makeup without known skin irritation or clogging pores.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 77231

CI 77231

2.5

CI 77231 is a colorant used for opacity, but it has raised safety concerns in other industries; in cosmetics, it is restricted to low concentrations.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 77400

CI 77400

3.5

CI 77400 is a safe, widely used colorant that adds red or copper hues to makeup, but it offers no skincare benefits and may cause irritation in very sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

CI 77713

CI 77713

3.5

A safe, natural mineral pigment that adds color or opacity but offers no skincare benefits.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

CI 77745

CI 77745

3.5

CI 77745 is a safe, widely used blue pigment in color cosmetics, but it's not a skincare active ingredient.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Cobalt Aluminum Oxide

Cobalt Aluminum Oxide

3.5

Cobalt Aluminum Oxide is a safe, stable blue pigment for cosmetics, but it's not a skincare active and offers no skin benefits beyond color.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Cobalt Titanium Oxide

Cobalt Titanium Oxide

3.0

A safe, stable pigment for color cosmetics, but not a skincare active and offers no skin benefits beyond color.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Cochineal Extract

CI 75470

3.5

A natural red dye from insects that gives vibrant color but may trigger allergies in sensitive individuals.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

Colloidal Gold

Colloidal Gold

3.5

Colloidal gold adds a luxurious shimmer and may offer mild antioxidant benefits, but its skincare effects are not well-proven and it comes with a high price tag.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

Curry Red

Curry Red

3.8

A natural red colorant from annatto seeds, generally safe for most skin types but may cause rare allergic reactions.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

D&C Orange 5

CI 45370

3.5

A safe, widely used synthetic colorant that adds orange tones to makeup, but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

D&C Orange No. 11

CI 11725

3.5

CI 11725 is a synthetic orange pigment approved for use in cosmetics, but it may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

D&C Orange No. 4

CI 15510

3.5

A widely used synthetic orange dye that is generally safe in the tiny amounts found in cosmetics, but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

D&C Red No. 17

CI 15630

3.5

A synthetic red dye approved for use in cosmetics, but with some restrictions due to potential impurities.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

D&C Red No. 36

CI 12085

3.5

A widely used synthetic red pigment that is generally safe in cosmetics but offers no skincare benefits beyond color.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

D&C Yellow 11

CI 47000

3.5

A widely used synthetic yellow dye that adds vibrant color to cosmetics, but some people may experience skin sensitivity.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Diethylaminomethylcoumarin

DIETHYLAMINOMETHYLCOUMARIN

3.0

A synthetic fluorescent dye used for color in cosmetics; generally considered safe at low concentrations but may cause rare allergic reactions.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Dihydroxyacetone

DIHYDROXYACETONE

4.0

DHA is the gold standard for sunless tanning, providing a natural-looking tan without UV exposure, but requires careful application to avoid streaks and uneven color.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Disperse Blue 377

Disperse Blue 377

2.0

A synthetic blue dye that adds vibrant color to wash-off products but offers no skincare benefit and may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Disperse Red 17

Disperse Red 17

2.8

Disperse Red 17 is a synthetic dye that adds red tones to cosmetics but may cause skin irritation or allergic reactions in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Disperse Violet 1

Disperse Violet 1

3.0

Disperse Violet 1 is a synthetic dye that adds violet color to cosmetics, but it may cause skin irritation or allergic reactions in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Disperse Violet 15

Disperse Violet 15

3.0

A synthetic violet dye used for color in cosmetics, but it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Europium Chloride

EUROPIUM CHLORIDE

2.5

A rare earth salt used for color, but with limited safety data and potential for irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Europium Complex

EUROPIUM TRIS(TRIFLUOROTHIENYLBUTANEDIONE) BIS(TRIPHENYLPHOSPHINE OXIDE)

2.5

A rare synthetic colorant with limited safety data; best reserved for occasional-use products.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

FD&C Red No. 4

CI 15980

3.5

A widely used synthetic red dye that is generally safe in cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferric Ammonium Citrate

Ferric Ammonium Citrate

3.5

A safe, non-irritating colorant that also offers mild astringent properties, but its cosmetic benefits beyond tinting are limited.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferric Ferrocyanide

CI 77510

3.5

A safe and widely used blue pigment in cosmetics, but it's purely for color and offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferric Nitrate

FERRIC NITRATE

2.5

Ferric nitrate is a synthetic salt that can act as a colorant or astringent, but it is rarely used in modern skincare due to potential irritation and limited benefits.

Irritation

moderate

Source

synthetic

beautyskincarecolorantastringent
Read ingredient review

Colorant

Ferrous Ammonium Sulfate

Ferrous Ammonium Sulfate

2.5

Ferrous ammonium sulfate is a synthetic iron salt used mainly as a colorant or chemical reagent in cosmetics; it is not a skincare active and may cause irritation at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferrous Aspartate

Ferrous Aspartate

3.0

Ferrous aspartate is a form of iron used mainly as a colorant in cosmetics; its skincare benefits are not well-established and it may cause staining.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferrous Fumarate

Ferrous Fumarate

2.5

Ferrous fumarate is a synthetic iron compound used mainly as a pigment in cosmetics; it has no proven skincare benefits and is not a substitute for dietary iron.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferrous Glucoheptonate

FERROUS GLUCOHEPTONATE

3.5

Ferrous Glucoheptonate is primarily used as a colorant in cosmetics, offering a subtle iron tone with low irritation potential, but it has limited skincare benefits beyond tinting.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferrous Lactate

Ferrous Lactate

3.5

Ferrous Lactate is a gentle iron salt used to tint products or support skin appearance, but it is not a major active ingredient.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Ferrous Sulfate

Ferrous Sulfate

2.5

Ferrous sulfate is primarily used as a colorant or astringent in cosmetics, but it offers little skincare benefit and may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecolorantastringent
Read ingredient review

Optical Brightener

Fluorescent Brightener 230

Fluorescent Brightener 230

2.5

Fluorescent Brightener 230 is a synthetic optical brightener that creates a temporary whitening effect by reflecting blue light, but it does not actually lighten skin or treat pigmentation.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Optical Brightener

Fluorescent Brightener 236

Fluorescent Brightener 236

2.5

Fluorescent Brightener 236 is a synthetic optical brightener that creates a temporary whitening effect on skin or hair, but it does not change your natural pigmentation or provide lasting brightening.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Optical Brightener

Fluorescent Brightener 367

Fluorescent Brightener 367

2.5

Fluorescent Brightener 367 is a synthetic optical brightener rarely used in leave-on skincare; it may create a temporary whitening effect but offers no skin benefit and is not a standard cosmetic ingredient.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Gold Powder

CI 77480

3.8

Gold powder adds a luxurious shimmer to makeup but offers no proven skincare benefits beyond decoration.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

Green 3 (CI 42053)

CI 42053

3.5

A widely used synthetic green dye that adds color to products but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Green 5 (CI 10006)

CI 10006

3.0

A widely used synthetic green pigment that is generally safe in cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Green 8

CI 59040

3.5

A synthetic green dye that adds color to rinse-off products; generally safe in tiny amounts but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review