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

Surfactant

Dilaureth-4 Phosphate

DILAURETH-4 PHOSPHATE

3.8

An effective synthetic surfactant that helps cleanse and emulsify, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Dilaureth-7 Citrate

DILAURETH-7 CITRATE

4.0

A gentle, citrate-based surfactant that helps cleanse without stripping the skin's natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Antioxidant

Dilauroyl 3-Glyceryl Ascorbate

Dilauroyl 3-Glyceryl Ascorbate

4.3

A gentle, stable vitamin C derivative that brightens skin and fights free radicals without the sting or instability of pure ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Emollient

Dilauryl Ether

Dilauryl Ether

3.8

A gentle synthetic emollient that softens skin and improves product feel without heavy greasiness.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Antioxidant

Dilauryl Thiodipropionate

DILAURYL THIODIPROPIONATE

3.5

A synthetic stabilizer that helps keep oils fresh, but it's not a star active for skin benefits.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antistatic Agent

Dilauryldimonium Chloride

Dilauryldimonium Chloride

3.8

A synthetic conditioning ingredient that smooths hair and reduces static, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Conditioning Agent

Dilinoleamidopropyl Dimethylamine

Dilinoleamidopropyl Dimethylamine

4.0

A gentle conditioning ingredient that improves softness and manageability without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Emollient

Dilinoleic Acid

Dilinoleic Acid

4.0

A gentle, barrier-strengthening fatty acid that helps lock in moisture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Film Former

Dilinoleic Acid Copolymer

DILINOLEIC ACID/SEBACIC ACID/PIPERAZINE/ETHYLENEDIAMINE COPOLYMER

3.8

A synthetic polymer that helps makeup and sunscreen stay put longer, but offers no direct skin benefit beyond its film-forming function.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Film Former

Dilinoleic Acid/Glycol Copolymer

DILINOLEIC ACID/GLYCOL COPOLYMER

4.0

A gentle film-forming polymer that helps skincare and makeup stay put without clogging pores or irritating skin.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
Read ingredient review

Antioxidant

Dill Extract

Peucedanum graveolens extract

3.8

Dill extract offers mild antioxidant and soothing benefits, but research on its cosmetic efficacy is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Dill Herb Oil

Anethum Graveolens Herb Oil

3.8

Dill Herb Oil adds a fresh herbal scent and mild antimicrobial benefits, but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Dill Leaf Powder

Anethum graveolens leaf powder

3.5

Dill leaf powder is a gentle botanical ingredient with antioxidant potential, but research on its cosmetic benefits is limited.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Fragrance

Dill Seed Oil

Anethum Graveolens Seed Oil

3.5

Dill Seed Oil adds a fresh, herbal scent to skincare products and may offer mild antioxidant benefits, but it can be irritating for sensitive skin and is mainly used for fragrance.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Film Former

Dimer Dilinoleic Acid Copolymer

DIETHYLENE GLYCOL/HYDROGENATED DIMER DILINOLEIC ACID COPOLYMER

4.0

A safe, synthetic film-former that helps products stay put and resist water without clogging pores.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Film Former

Dimer Dilinoleic Copolymer

Bis-Dioctadecylamide Dimer Dilinoleic Acid/Ethylenediamine Copolymer

3.8

A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Emollient

Dimer Dilinoleyl Dimer Dilinoleate

Dimer Dilinoleyl Dimer Dilinoleate

4.0

A gentle, plant-derived emollient that forms a breathable film on skin to reduce water loss and improve product feel without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Film Former

Dimer Rosin

Dimer Rosin

3.5

Dimer Rosin is a modified tree resin that helps makeup and hair products stay put, but it may feel sticky or heavy on some skin types.

Irritation

low

Source

natural

beautyskincarefilm-former
Read ingredient review

Anti-aging agent

Dimer Tripeptide-43

Dimer Tripeptide-43

3.8

A lab-made peptide that may help support collagen and improve skin firmness, but human studies are limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Occlusive

Dimethicone

Dimethicone

4.2

A well-studied silicone that provides a silky feel and temporary barrier without clogging pores for most people.

Irritation

low

Source

synthetic

beautyskincareocclusive
Read ingredient review

Film Former

Dimethicone Crosspolymer

Dimethicone Crosspolymer

4.3

A gentle silicone that gives a smooth, matte finish without clogging pores — great for oily or combination skin.

Irritation

low

Source

synthetic

beautyskincaresilicone
Read ingredient review

Film Former

Dimethicone Crosspolymer Blend

DIMETHICONE/VINYLTRIMETHYLSILOXYSILICATE CROSSPOLYMER

4.0

A gentle silicone powder that gives a silky finish and helps makeup stay put without clogging pores.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Film Former

Dimethicone Crosspolymer-3

Dimethicone Crosspolymer-3

4.0

A gentle silicone powder that gives a silky, matte finish and helps control shine without clogging pores.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Film Former

Dimethicone Methacrylate

Dimethicone Methacrylate

3.5

A silicone polymer that helps products feel silky and last longer, but it's purely synthetic and not a treatment ingredient.

Irritation

low

Source

synthetic

beautyskincarefilm former
Read ingredient review

Hair Conditioner

Dimethicone PEG-15 Acetate

DIMETHICONE PEG-15 ACETATE

3.8

A gentle silicone derivative that smooths hair and skin without heavy buildup, but may not suit those avoiding all silicones or PEG compounds.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

Dimethicone PEG-3 Laurate

DIMETHICONE PEG-3 LAURATE

3.8

A gentle silicone emulsifier that improves texture and stability, but may not suit those avoiding silicones or ethoxylated ingredients.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

Dimethicone PEG-7 Avocadoate

DIMETHICONE PEG-7 AVOCADOATE

4.0

A gentle silicone emollient that combines the smoothing power of dimethicone with the nourishing properties of avocado oil, making it a good choice for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

Dimethicone PEG-7 Cocoate

DIMETHICONE PEG-7 COCOATE

4.0

A gentle silicone-coconut hybrid that helps mix oil and water, leaving skin and hair feeling soft without heavy residue.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Emollient

Dimethicone PEG-7 Lactate

Dimethicone PEG-7 Lactate

4.0

A gentle silicone derivative that improves product feel and skin softness, generally well-tolerated by most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

Dimethicone PEG-7 Olivate

DIMETHICONE PEG-7 OLIVATE

4.0

A gentle silicone emulsifier that helps create smooth, stable formulas while adding a light, non-greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

Dimethicone PEG-7 Phosphate

DIMETHICONE PEG-7 PHOSPHATE

4.0

A gentle silicone emulsifier that helps mix water and oil, making formulas feel smooth without heavy residue.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

Dimethicone PEG-7 Phthalate

Dimethicone PEG-7 Phthalate

3.5

A silicone-based emulsifier that helps formulas feel smooth and spread easily, but its phthalate component raises unnecessary concern despite being chemically different from controversial phthalates.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

Dimethicone PEG-7 Sulfate

Dimethicone PEG-7 Sulfate

3.8

A gentle silicone-based cleanser that helps remove dirt and oil while leaving hair and skin feeling soft, but may not suit those avoiding silicones.

Irritation

low

Source

semi-synthetic

beautyskincarehaircaresurfactant
Read ingredient review

Emulsifier

Dimethicone PEG-7 Undecylenate

DIMETHICONE PEG-7 UNDECYLENATE

4.0

A gentle silicone emulsifier that helps products spread smoothly and feel silky, with very low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

Dimethicone PEG-8 Adipate

DIMETHICONE PEG-8 ADIPATE

4.0

A gentle silicone emollient that helps products glide on smoothly and leaves skin feeling soft without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dimethicone PEG-8 Avocadoate

DIMETHICONE PEG-8 AVOCADOATE

4.0

A hybrid silicone-and-avocado emollient that smooths skin and improves product feel without heavy greasiness.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dimethicone PEG-8 Beeswax

Dimethicone PEG-8 Beeswax

3.8

A silicone-wax hybrid that gives products a smooth, silky feel and helps them stay put, but may feel heavy on oily skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dimethicone PEG-8 Benzoate

Dimethicone PEG-8 Benzoate

4.0

A gentle silicone derivative that improves product texture and feel without clogging pores or causing irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review