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

Conditioning agent

Amp-Isostearoyl Hydrolyzed Wheat Protein

AMP-ISOSTEAROYL HYDROLYZED WHEAT PROTEIN

4.0

A gentle, protein-based conditioning ingredient that adds softness and manageability to hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Film Former

AMPD-Acrylates Copolymer

AMPD-ACRYLATES/DIACETONEACRYLAMIDE COPOLYMER

3.5

A synthetic film-former that helps products stay put, but it can feel tight or dry on some skin types.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Skin conditioning agent

Ampd-Isostearoyl Hydrolyzed Collagen

AMPD-ISOSTEAROYL HYDROLYZED COLLAGEN

3.8

A gentle collagen derivative that adds a light film to skin, helping it feel smooth and hydrated without heavy residue.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Film-Former

AMPD-Rosin Hydrolyzed Collagen

AMPD-Rosin Hydrolyzed Collagen

3.5

A semi-synthetic collagen derivative that forms a light film on skin to help retain moisture, but research on its benefits is still limited.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
Read ingredient review

Antioxidant

Ampelopsis Leaf Extract

AMPELOPSIS GROSSEDENTATA LEAF EXTRACT

4.0

A gentle plant extract with antioxidant and soothing potential, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Amur Cork Tree Bark Ferment

Saccharomyces/Phellodendron Amurense Bark Ferment Extract

4.0

A fermented botanical extract that soothes and protects skin with antioxidants, ideal for sensitive or stressed skin.

Irritation

low

Source

biotech

beautyskincaresoothing agent
Read ingredient review

Antioxidant

Amur Cork Tree Stem Extract

PHYSOCARPUS AMURENSIS STEM EXTRACT

3.8

A gentle plant extract that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Amur Grape Root Extract

Vitis Amurensis Root Extract

4.0

A gentle, plant-derived antioxidant that helps protect skin from environmental stress without irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Amur Jack-in-the-Pulpit Extract

Arisaema Amurense Extract

3.5

A traditional plant extract with potential soothing benefits, but research is limited and it's not a mainstream ingredient.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Solvent

Amyl Acetate

Amyl Acetate

3.5

Amyl acetate is a synthetic fragrance ingredient with a fruity scent; it can be irritating for sensitive skin in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Solvent

Amyl Alcohol

AMYL ALCOHOL

3.5

Amyl alcohol is a solvent that helps dissolve other ingredients, but it can be drying or irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Fragrance Ingredient

Amyl Benzoate

AMYL BENZOATE

3.5

Amyl benzoate is a synthetic fragrance ingredient that adds a pleasant scent to products, but it offers no direct skin benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amyl Butyrate

Amyl Butyrate

3.5

Amyl Butyrate adds a sweet, fruity scent to products 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

Fragrance

Amyl Cinnamal

AMYL CINNAMAL

3.5

A common synthetic fragrance allergen that can cause skin reactions in sensitive individuals, but is generally safe for most people at low concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amyl Cinnamate

Amyl Cinnamate

3.5

Amyl Cinnamate is a synthetic fragrance ingredient that adds a sweet, floral scent but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Amyl Cyclopentanone Propanone

AMYL CYCLOPENTANONE PROPANONE

3.5

A synthetic fragrance ingredient that adds a floral jasmine note; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Amyl Ethyl Ketone

AMYL ETHYL KETONE

3.0

Amyl ethyl ketone is a synthetic fragrance ingredient that adds a fruity, spicy scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amyl Formate

Amyl Formate

3.5

Amyl formate is a synthetic fragrance ingredient that adds a fruity, apple-like scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amyl Hexanoate

AMYL HEXANOATE

4.0

Amyl Hexanoate is a safe, fruity-smelling synthetic ester used to add a pleasant apple-like scent to cosmetics, with a low risk of irritation for most people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amyl Isobutyrate

AMYL ISOBUTYRATE

3.5

Amyl isobutyrate is a synthetic fragrance ingredient that adds a fruity, sweet scent but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Amyl Isovalerate

AMYL ISOVALERATE

3.5

Amyl Isovalerate is a synthetic fragrance ester that adds a fruity, apple-like scent to products, but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Amyl Octanoate

Amyl Octanoate

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Amyl Phenylacetate

AMYL PHENYLACETATE

3.8

Amyl phenylacetate is a synthetic fragrance ingredient that adds a sweet, honey-like scent to products; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amyl Propionate

Amyl Propionate

3.5

Amyl Propionate is a synthetic fragrance ingredient that adds a fruity, apple-like scent, but offers no skincare benefits and may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amyl Salicylate

Amyl Salicylate

3.5

Amyl Salicylate is a synthetic fragrance ingredient that adds a sweet, floral scent to products; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Amyl Valerate

Amyl Valerate

4.0

A lightweight, non-greasy emollient that softens skin without clogging pores, ideal for oily or combination skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Exfoliant

Amylase

AMYLASE

3.8

Amylase is a gentle enzyme exfoliant that dissolves dead skin cells by breaking down surface starches, making skin smoother without harsh scrubbing.

Irritation

low

Source

biotech

beautyskincareexfoliant
Read ingredient review

Fragrance Ingredient

Amylcinnamal Diethyl Acetal

AMYLCINNAMAL DIETHYL ACETAL

3.5

A synthetic floral scent ingredient that may cause skin irritation or allergic reactions in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amylcinnamal Dimethyl Acetal

AMYLCINNAMAL DIMETHYL ACETAL

3.5

A synthetic fragrance ingredient that provides a jasmine-like scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amylcinnamyl Acetate

AMYLCINNAMYL ACETATE

3.5

A common synthetic fragrance ingredient that adds a floral scent but is a known allergen for some people, especially those with sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amylcinnamyl Alcohol

AMYLCINNAMYL ALCOHOL

3.5

Amylcinnamyl alcohol is a common synthetic fragrance that adds a sweet floral scent, but it is a known allergen that may cause skin reactions in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amylcyclopentanone

AMYLCYCLOPENTANONE

3.5

Amylcyclopentanone is a synthetic scent ingredient that adds a pleasant floral-fruity note, but it offers no skincare benefit and may cause sensitivity in those with fragrance allergies.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Amylcyclopentenone

AMYLCYCLOPENTENONE

3.5

Amylcyclopentenone is a synthetic fragrance ingredient that adds a sweet, floral scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Amylfuran

AMYLFURAN

3.0

Amylfuran 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

Amylisoeugenol

AMYLISOEUGENOL

3.5

Amylisoeugenol is a synthetic fragrance compound that adds a warm, spicy scent but may cause skin irritation or allergic reactions in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Exfoliant

Amyloglucosidase

Amyloglucosidase

4.0

A gentle enzyme exfoliant that dissolves dead skin cells without scrubbing, ideal for sensitive skin.

Irritation

low

Source

biotech

beautyskincareexfoliant
Read ingredient review

Film-Former

Amylopectin

AMYLOPECTIN

3.8

A gentle, plant-derived film-former that helps products feel smooth and can provide a light, non-sticky barrier on skin.

Irritation

low

Source

natural

beautyskincarefilm-former
Read ingredient review

Film-Forming Agent

Amylose

AMYLOSE

3.8

Amylose is a gentle, natural starch derivative that helps create a smooth, lightweight film on the skin, improving texture and moisture retention without clogging pores.

Irritation

low

Source

natural

beautyskincarefilm-former
Read ingredient review

Fragrance

Amylvinyl Carbinol

AMYLVINYL CARBINOL

3.5

Amylvinyl carbinol is a natural mushroom-derived alcohol used mainly for scent, with some early research suggesting mild antimicrobial benefits, but it can be a skin sensitizer for some.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Amylvinylcarbinyl Acetate

AMYLVINYLCARBINYL ACETATE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Amyris Balsamifera Bark Oil

AMYRIS BALSAMIFERA BARK OIL

3.8

A natural essential oil with a warm, woody scent that may offer mild skin-soothing benefits, but can cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Anti-aging agent

Anacardoyl Peptide Complex

Anacardoyl SH-Pentapeptide-5 Tripeptide-1

4.0

A synthetic peptide blend that may help improve skin firmness and reduce fine lines, but more human studies are needed to confirm its effects.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging

Anacardoyl Tripeptide-1

Anacardoyl Tripeptide-1

4.0

A promising peptide that may help firm skin and soften lines, but more human studies are needed to confirm its effects.

Irritation

low

Source

semi-synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Anacardoyl Tripeptide-35

Anacardoyl Tripeptide-35

3.8

A synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Abrasive

Anadara Shell Powder

ANADARA KAGOSHIMENSIS SHELL POWDER

3.5

A natural exfoliant from clam shells that gently polishes skin, but may be too scratchy for sensitive or compromised skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review

Skin conditioning agent

Andesite Extract

Andesite Extract

3.5

A mineral-rich volcanic rock extract that may support skin barrier function, but research is limited and benefits are not well-established.

Irritation

low

Source

natural

beautyskincaremineral
Read ingredient review

Emollient

Andiroba Seed Oil

Carapa guaianensis seed oil

4.0

A gentle Amazonian oil that hydrates and soothes, ideal for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Exfoliant

Andiroba Seed Powder

Carapa guaianensis seed powder

3.8

A gentle, natural seed powder that helps exfoliate and absorb excess oil without harshness, but research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Antioxidant

Andrographolide

ANDROGRAPHOLIDE

3.8

A plant-derived compound with promising antioxidant and soothing benefits, though research in topical skincare is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Androsace Helvetica Extract

Androsace Helvetica Extract

3.8

A gentle alpine plant extract that may help calm irritated skin and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Antioxidant

Androsace Umbellata Extract

ANDROSACE UMBELLATA EXTRACT

3.5

A gentle plant extract with antioxidant potential, but research on its specific benefits for skin is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Antioxidant

Anemarrhena Callus Extract

ANEMARRHENA ASPHODELOIDES CALLUS CONDITIONED MEDIA EXTRACT

4.0

A gentle, plant-derived extract with antioxidant and soothing potential, though research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Antioxidant

Anemarrhena Root Extract

ANEMARRHENA ASPHODELOIDES ROOT EXTRACT

4.0

Anemarrhena Root Extract is a gentle botanical with antioxidant and soothing potential, but human skin research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidantsoothing
Read ingredient review

Fragrance

Anethole

ANETHOLE

3.5

Anethole adds a sweet, licorice-like scent to products but can be irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Anetholea Anisata Leaf Extract

ANETHOLEA ANISATA LEAF EXTRACT

3.8

A gentle botanical extract with antioxidant potential, but research is limited compared to more established plant extracts.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review