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

Antioxidant

Acetylated Juniper Extract

JUNIPERUS EXTRACT ACETYLATED

3.8

A gentle, antioxidant-rich botanical extract that may help calm skin, but research on the acetylated form is limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Emollient

Acetylated Lard Glyceride

Acetylated Lard Glyceride

3.5

A semi-synthetic emollient that softens skin but may clog pores for some, and is not suitable for vegan or certain religious lifestyles.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Fragrance

Acetylated Lavandin Extract

LAVANDULA HYBRIDA EXTRACT ACETYLATED

3.8

A gentle, aromatic ingredient from lavandin that may offer mild soothing benefits, but its acetylation process alters its properties and safety profile.

Irritation

moderate

Source

semi-synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Acetylated Lavender Extract

LAVANDULA ANGUSTIFOLIA (LAVENDER) HERB EXTRACT ACETYLATED

3.8

A modified lavender extract that offers a gentle scent and potential soothing benefits, but research on the acetylated version is limited.

Irritation

low

Source

semi-synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Acetylated Monoglycerides

MONOGLYCERIDES ACETATE

4.0

A gentle, semi-synthetic emollient that softens skin and improves product feel without common irritation or clogging concerns.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Fragrance

Acetylated Myrcene

7-METHYL-3-METHYLENE-1,6-OCTADIENE ACETYLATED

3.5

A synthetic fragrance ingredient that adds scent but offers no skin benefit and may irritate sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Antioxidant

Acetylated Palo Santo Extract

BULNESIA SARMIENTOI EXTRACT ACETYLATED

3.8

A modified plant extract with antioxidant potential, but research is limited and its benefits are not well-established.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Emollient

Acetylated Sucrose Distearate

Acetylated Sucrose Distearate

4.0

A gentle, sugar-derived emollient that helps products feel silky and spread smoothly without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Antioxidant

Acetylated Swiss Pine Extract

Pinus Cembra Twig Leaf Extract Acetylated

3.8

A gentle, antioxidant-rich extract from Swiss pine that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Acetylated Vetiver Root Extract

VETIVERIA ZIZANIOIDES ROOT EXTRACT ACETYLATED

4.0

A gentle, antioxidant-rich ingredient that may help calm skin and protect against environmental stress.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance

Acetylbenzofuran

ACETYLBENZOFURAN

3.5

Acetylbenzofuran 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

Fragrance

Acetylcedrene

ACETYLCEDRENE

3.5

Acetylcedrene is a synthetic woody fragrance ingredient that is generally safe at low concentrations but may cause skin sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Anti-aging agent

Acetylglutaminoyl Farnesylcysteine

Acetylglutaminoyl Farnesylcysteine

3.8

A synthetic peptide that may help support skin firmness and reduce the look of fine lines, but human research is still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin conditioning

Acetylmethionyl Methylsilanol Elastinate

ACETYLMETHIONYL METHYLSILANOL ELASTINATE

3.8

A silicone-modified protein that may temporarily smooth and firm skin, but long-term anti-aging benefits are not well proven.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Humectant

Acetylneuraminic Acid

Acetylneuraminic Acid

4.0

A gentle, naturally derived humectant that helps keep skin hydrated and supports a healthy barrier without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Antioxidant

Achyranthes Fauriei Root Extract

Achyranthes Fauriei Root Extract

3.8

A gentle, antioxidant-rich root extract that may help calm skin and fight free radicals, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Achyrocline Flower Extract

ACHYROCLINE SATUREIOIDES FLOWER EXTRACT

3.8

A gentle, antioxidant-rich flower extract that may help calm skin and fight free radical damage, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Achyrocline Leaf Extract

ACHYROCLINE SATUREIOIDES LEAF EXTRACT

3.8

A gentle herbal extract with antioxidant potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Achyrocline Satureioides Extract

ACHYROCLINE SATUREIOIDES FLOWER/LEAF/STEM EXTRACT

3.8

A gentle botanical extract with antioxidant potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Colorant

Acid Black 1

CI 28440

3.0

A safe, widely used synthetic dye in rinse-off cosmetics, but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Blue 1

CI 61585

3.5

A synthetic blue dye that adds color to cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Blue 3

CI 42051

3.0

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

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Blue 62

CI 62045

3.0

CI 62045 is a safe, widely used blue dye in cosmetics, but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Blue 74

CI 73015

3.5

A safe, widely used synthetic blue dye that adds color but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Blue 74 Aluminum Lake

Acid Blue 74 Aluminum Lake

3.5

A widely used blue pigment that adds color to makeup and bath products; generally safe but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Blue 9

CI 73000

3.5

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

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Blue 9 Aluminum Lake

Acid Blue 9 Aluminum Lake

3.5

A widely approved synthetic blue pigment that adds color to cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Green 25

CI 42170

3.5

A widely used synthetic dye that adds blue-green color to cosmetics; generally considered safe at low concentrations but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Green 50

Acid Green 50

3.0

A common synthetic green dye that adds color to products but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Orange 7

CI 15510

3.0

A widely used synthetic orange dye that is generally safe in low concentrations but may cause allergic reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 14

CI 14720

3.0

A widely used synthetic red dye that adds color to cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 14 Aluminum Lake

Acid Red 14 Aluminum Lake

3.5

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

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 18

CI 24790

3.0

A widely used synthetic red dye that is generally safe in cosmetics at low levels, but may cause allergic reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 18 Aluminum Lake

Acid Red 18 Aluminum Lake

3.5

A widely used synthetic pigment that adds vibrant red shades to makeup, generally considered safe at low concentrations but best avoided on broken skin.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 184

ACID RED 184

3.0

A synthetic red dye that adds color to makeup and personal care products, generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 195

Acid Red 195

3.0

A synthetic red dye that adds color to cosmetics but offers no skincare benefits; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 27

CI 18736

3.0

CI 18736 is a common synthetic red dye that adds color to cosmetics but has limited skincare benefits and may cause allergic reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 27 Aluminum Lake

ACID RED 27 ALUMINUM LAKE

3.5

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

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 33

CI 45220

3.5

A widely used synthetic red dye that adds vibrant color to makeup, but may cause allergic reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 52

CI 45100

3.5

A widely used synthetic red dye that adds color to cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 88

CI 15620

3.0

A synthetic red dye approved for use in cosmetics, but some individuals may experience sensitivity.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Red 92

Acid Red 92

3.5

A widely used synthetic dye that adds vibrant red color to cosmetics, but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Violet 43

CI 69800

3.5

CI 69800 is a safe, widely used synthetic violet dye that adds color to cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Acid Yellow 1

CI 10316

3.5

A synthetic yellow dye that is generally safe in rinse-off cosmetics but offers no skincare benefit.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review