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

Film Former

Octafluoropentyl Methacrylate

OCTAFLUOROPENTYL METHACRYLATE

3.5

A synthetic film-former that helps products resist water and sweat, but its environmental persistence raises concerns.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Fragrance

Octahydro Dimethylazulenyl Propanol

OCTAHYDRO-3,8-DIMETHYLAZULEN-5-YLPROPAN-2-OL

3.5

A synthetic scent ingredient that gives a warm, woody aroma but offers no skincare benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro Dimethylnaphthalene Carbonitrile

OCTAHYDRO-8,8-DIMETHYLNAPHTHALENE-2-CARBONITRILE

3.5

A synthetic scent ingredient that adds a fresh, woody note to products but offers no skincare benefit and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro Trimethyl Naphthalenol

CIS-OCTAHYDRO-TRIMETHYL-4A-NAPHTHALENOL

3.5

A synthetic scent ingredient that adds a warm, woody aroma but offers no skincare benefits and may be unnecessary for sensitive noses.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro Trimethylspiro Methanoazulene Oxirane

OCTAHYDRO-TRIMETHYLSPIRO-METHANOAZULENE-6,2'-OXIRANE

3.5

A synthetic fragrance ingredient that adds a warm, woody scent; generally considered safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro-Hexamethyl-Naphthoxirene

OCTAHYDRO-HEXAMETHYL-NAPHTHOXIRENE

3.5

A synthetic fragrance compound that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro-Methyl-Methanonaphthalenone

OCTAHYDRO-METHYL-METHANONAPHTHALENONE

3.5

A synthetic fragrance compound that adds a warm, woody 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 Component

Octahydro-Pentamethyl-Indene

OCTAHYDRO-PENTAMETHYL-INDENE

3.5

A synthetic scent ingredient that adds a warm, woody note to products; generally considered safe at low levels but may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro-Tetramethyl-Methanoazulenone

OCTAHYDRO-TETRAMETHYL-METHANOAZULENONE

3.5

A synthetic fragrance compound that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Component

Octahydro-Tetramethyl-Naphthalenol

OCTAHYDRO-TETRAMETHYL-1-NAPHTHALENOL

3.8

A synthetic scent ingredient that adds a warm, woody note to products; generally safe at low levels but may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro-Trimethyl-Ethano-Naphthoxirene

OCTAHYDRO-TRIMETHYL-ETHANO-NAPHTHOXIRENE

3.5

A synthetic fragrance compound that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydro-Trimethyl-Naphthoxiren-7-ol

OCTAHYDRO-TRIMETHYL-NAPHTHOXIREN-7-OL

3.5

A synthetic fragrance ingredient that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octahydrodimethyl Methano-Indenooxirene

OCTAHYDRODIMETHYL-2,5-METHANO-INDENOOXIRENE

3.5

A synthetic scent ingredient that adds a woody, amber-like note; generally safe at low levels but may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance ingredient

Octahydrospiro-dioxolanemethanoindene

OCTAHYDROSPIRO-DIOXOLANEMETHANOINDENE

3.5

A synthetic scent ingredient that adds a woody, amber-like aroma; generally safe at low levels but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Octanal

OCTANAL

3.5

Octanal is a synthetic fragrance ingredient that adds a fresh citrus scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Octanal/Methyl Anthranilate Schiff Base

OCTANAL/METHYL ANTHRANILATE SCHIFF BASE

3.5

A synthetic fragrance compound that adds a pleasant floral-citrus scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Solvent

Octane

Octane

2.5

Octane is a synthetic hydrocarbon that may act as a solvent in cosmetics, but it is rarely used in leave-on skincare and has limited safety data for topical use.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

Anti-aging agent

Octapeptide-20 Amide

Octapeptide-20 Amide

3.8

A synthetic peptide that may help soften expression lines and improve skin firmness, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Octapeptide-21 Amide

Octapeptide-21 Amide

4.0

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

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Skin conditioning agent

Octapeptide-26

Octapeptide-26

3.8

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

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Octapeptide-27 Amide

Octapeptide-27 Amide

4.0

A synthetic peptide that may help soften expression lines and improve skin firmness, but more independent human studies are needed.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Octapeptide-29 Trifluoroacetate

Octapeptide-29 Trifluoroacetate

4.0

A synthetic peptide that may help firm skin and soften fine lines, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Octapeptide-30

Octapeptide-30

3.8

A synthetic peptide that may help support collagen and reduce fine lines, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Octapeptide-32

Octapeptide-32

3.8

A lab-made peptide that may help soften expression lines over time, but independent human research is still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Octapeptide-33

Octapeptide-33

3.8

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

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Octapeptide-34

Octapeptide-34

3.8

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

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Octapeptide-35

Octapeptide-35

3.8

Octapeptide-35 is a lab-made peptide that may help support collagen and reduce fine lines, but human research is still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Octapeptide-36

Octapeptide-36

3.8

Octapeptide-36 is a lab-made peptide that may help reduce the look of fine lines and wrinkles, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Antioxidant

Octatrienoic Acid

Octatrienoic Acid

3.5

Octatrienoic Acid is a synthetic fatty acid with antioxidant potential, but research on its benefits in skincare is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Solvent

Octene

Octene

3.5

Octene is a synthetic solvent that helps products spread smoothly and dissolve oils, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Emollient

Octene Hydroformylated-Distilled

OCTENE HYDROFORMYLATED-DISTILLED

3.5

A synthetic emollient that helps products glide on smoothly without heavy greasiness, but has limited research on long-term skin benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Antimicrobial

Octenidine HCl

Octenidine HCl

3.5

Octenidine HCl is a potent antimicrobial used in medical antiseptics, not a typical skincare ingredient; it may be too harsh for daily cosmetic use.

Irritation

moderate

Source

synthetic

beautyskincareantimicrobial
Read ingredient review

Film Former

Octenylsuccinate Acacia Gum

ACACIA SEYAL GUM OCTENYLSUCCINATE

4.0

A gentle, modified natural gum that helps stabilize formulas and leaves a smooth, non-sticky feel on skin.

Irritation

low

Source

semi-synthetic

beautyskincaretexturizer
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UV Filter

Octinoxate

Ethylhexyl Methoxycinnamate

3.8

Octinoxate is a widely used UVB filter that protects skin from sunburn, but it has raised environmental concerns and may cause skin reactions in some people.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

UV Filter

Octocrylene

Octocrylene

3.5

Octocrylene is a widely used sunscreen ingredient that effectively absorbs UVB rays, but it has raised some environmental and stability concerns.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

Surfactant

Octoxynol-1

Octoxynol-1

3.5

Octoxynol-1 is a synthetic emulsifier that helps mix oil and water, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Octoxynol-33

Octoxynol-33

3.8

Octoxynol-33 is a synthetic emulsifier that helps mix oil and water in cleansers and shampoos, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Octoxynol-70

Octoxynol-70

3.5

Octoxynol-70 is a synthetic emulsifier that helps cleanse but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Octoxynol-9

Octoxynol-9

3.0

Octoxynol-9 is an effective emulsifier and cleanser, but its environmental persistence and potential for mild irritation make it a less preferred choice for sensitive skin or eco-conscious routines.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Octoxynol-9 Carboxylic Acid

Octoxynol-9 Carboxylic Acid

3.8

A gentle synthetic surfactant that effectively cleanses without the harshness of traditional soaps, making it suitable for sensitive skin.

Irritation

low

Source

synthetic

beautyskincarecleansing
Read ingredient review

UV Absorber

Octrizole

Octrizole

4.0

Octrizole is a synthetic UV filter that helps protect skin from sun damage, but it's less common in the US than in Europe and Asia.

Irritation

low

Source

synthetic

beautyskincaresunscreen
Read ingredient review

Solvent

Octyl Acetate

Octyl Acetate

3.8

Octyl Acetate is a safe, low-irritation synthetic ester used mainly as a solvent and light fragrance component in cosmetics.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin Conditioning

Octyl Butenoate

Octyl 2-Butenoate

3.5

A mild synthetic ester that helps condition skin and improve product feel, but research on its long-term effects is limited.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Fragrance Ingredient

Octyl Formate

Octyl Formate

3.5

Octyl Formate is a synthetic fragrance ingredient that adds a fruity scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Octyl Isobutyrate

Octyl Isobutyrate

4.0

A mild synthetic ester that helps products feel silky and spread easily, but it's mainly used for texture and scent, not active skincare benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Octyldecyl Oleate

OCTYLDECYL OLEATE

4.0

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

Irritation

low

Source

synthetic

beautyskincareemollient
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Surfactant

Octyldecyl Phosphate

Octyldecyl Phosphate

3.8

Octyldecyl Phosphate is a mild synthetic emulsifier that helps stabilize formulas and improve texture, with a low risk of irritation for most skin types.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review