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 30 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

Red 88

Pigment Red 88 (CI 73312)

3.5

A stable, vivid red pigment approved for cosmetic use in many regions, but with limited safety data compared to more common colorants.

Irritation

low

Source

synthetic

beautycosmeticscolorant
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Colorant

Red Iron Oxide

CI 77015

4.0

A safe, natural mineral pigment that gives red and pink hues to makeup without common irritation.

Irritation

low

Source

natural

beautyskincarecolorant
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Colorant

Rhodochrosite Extract

Rhodochrosite Extract

2.5

Rhodochrosite is a natural mineral colorant with no proven skincare benefits beyond its pink hue.

Irritation

low

Source

natural

beautyskincarecolorant
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Colorant

Silver Oxide

SILVER OXIDE

2.5

Silver oxide is a rare cosmetic ingredient with potential antimicrobial benefits, but its safety profile is not well-established for routine skincare use.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Sodalite Powder

Sodalite Powder

3.0

Sodalite powder adds a natural blue hue and a silky feel to cosmetics, but its skincare benefits are not well-studied.

Irritation

low

Source

natural

beautyskincarecolorant
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Colorant

Sodium Ferrocyanide

Sodium Ferrocyanide

2.5

Sodium ferrocyanide is a rare cosmetic ingredient used mainly as a color stabilizer; it is safe at low levels but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Solvent Red 48

SOLVENT RED 48

3.0

A common synthetic red dye approved for use in cosmetics, but best limited to rinse-off products to avoid potential staining or sensitivity.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Solvent Yellow 172

SOLVENT YELLOW 172

2.5

A synthetic yellow dye that adds color to products but offers no skincare benefits; generally safe in low concentrations.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Solvent Yellow 18

SOLVENT YELLOW 18

2.5

Solvent Yellow 18 is a synthetic yellow dye used for coloring cosmetics, but it has limited safety data and is not commonly found in modern skincare formulations.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Solvent Yellow 85

Solvent Yellow 85

2.0

Solvent Yellow 85 is a synthetic yellow dye used mainly in rinse-off products, but it has raised some safety concerns regarding skin sensitization.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
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

Colorant

Tin

TIN

2.0

Tin is a safe, low-risk metallic pigment used in small amounts for color in cosmetics, but it offers no skincare benefits.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

Titanium Nitride

Titanium Nitride

3.5

Titanium Nitride is a safe, non-irritating pigment that adds shimmer and color to makeup, but it offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Tungsten Oxide

TUNGSTEN OXIDE

2.5

Tungsten oxide is a safe colorant used in small amounts for tinting cosmetics, but it offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Turquoise Powder

TURQUOISE POWDER

2.5

Turquoise Powder adds a natural blue-green hue to cosmetics but offers no proven skincare benefits and may cause irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

Ultramarines

ULTRAMARINES

4.0

Ultramarines are safe, vivid mineral pigments widely used in color cosmetics, but they can cause irritation in rare cases for sensitive skin.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Umber

CI 77492 / CI 77491 / CI 77499 (Iron Oxides)

4.5

Umber is a safe, natural mineral pigment that gives warm brown tones to makeup without common irritation concerns.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

Xenotime

Xenotime

2.0

Xenotime is a rare mineral used mainly as a colorant in cosmetics; there is very little research on its skincare benefits or safety.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Colorant

Yellow 5 Lake

CI 21108

3.5

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

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Yellow 6 (CI 15985)

CI 15985

3.5

A widely used synthetic colorant that adds yellow-orange shades to cosmetics, generally considered safe in approved concentrations but may cause reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Yellow 7 (CI 45350)

CI 45350

3.5

CI 45350 is a synthetic yellow dye that adds color to cosmetics; it is generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Yellow 7 Lake

CI 21100

3.0

A common synthetic pigment that adds yellow color to makeup and bath products, generally considered safe for topical use.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Yellow Lake

CI 11680

3.5

CI 11680 is a safe, widely used yellow pigment in cosmetics, but it offers no skincare benefits and is purely for color.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Opacifying Agent

Zinc Sulfide

ZINC SULFIDE

3.0

Zinc sulfide is a safe, low-irritation mineral pigment used to add opacity or a slight white tint to cosmetics, but it offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review