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

Dimethoxyphenyl Dimethyl Pentanedione

1-(3,4-DIMETHOXYPHENYL)-4,4-DIMETHYL-1,3-PENTANEDIONE

3.5

A synthetic antioxidant that may help protect skin from environmental stress, but research is still early and benefits are not yet proven in human studies.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Skin brightener

Dimethoxytolyl Propylresorcinol

Dimethoxytolyl Propylresorcinol

4.5

A well-researched synthetic ingredient that effectively reduces dark spots and uneven skin tone with minimal irritation.

Irritation

low

Source

synthetic

beautyskincarebrightening agent
Read ingredient review

Sensory Enhancer

Dimethyl 9-Decenamide

Dimethyl 9-Decenamide

3.5

A synthetic ingredient that improves the sensory feel of products without adding heavy oils or silicones.

Irritation

low

Source

synthetic

beautyskincaresensory modifier
Read ingredient review

Emollient

Dimethyl Adipate

Dimethyl Adipate

3.8

A lightweight, non-greasy emollient that helps other ingredients spread smoothly and evaporates quickly, leaving a silky feel.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Humectant

Dimethyl Aspartic Acid

Dimethyl Aspartic Acid

3.8

A gentle, lab-made amino acid derivative that may help skin retain moisture and feel smoother, though research is still early.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Antistatic Agent

Dimethyl Behenamine

Dimethyl Behenamine

4.0

A gentle conditioning ingredient that helps detangle hair and soften skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Fragrance Ingredient

Dimethyl Benzenebutanol

Dimethyl Benzenebutanol

3.5

A synthetic fragrance ingredient that adds a pleasant floral scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Dimethyl Brassylate

Dimethyl Brassylate

4.0

A gentle, plant-derived emollient that softens skin without clogging pores, ideal for sensitive and oily skin types.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Dimethyl Capramide

Dimethyl Capramide

3.8

A gentle synthetic emollient that softens skin and improves product texture, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Solvent

Dimethyl Carbonate

Dimethyl Carbonate

3.8

A mild solvent that helps products spread and dry quickly, but its role is purely functional — it doesn't actively improve skin.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Surfactant

Dimethyl Cocamine

DIMETHYL COCAMINE

3.5

A coconut-derived surfactant that helps cleanse and condition, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincaresurfactant
Read ingredient review

Fragrance Ingredient

Dimethyl Cyclohexene Carbaldehyde

DIMETHYL-3-CYCLOHEXENE-1-CARBALDEHYDE

3.5

A synthetic fragrance component that provides a pleasant scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Cyclohexene Carboxaldehyde

2,4-DIMETHYL-3-CYCLOHEXENE CARBOXALDEHYDE

3.5

A synthetic scent ingredient that adds a fresh, citrus note but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Cyclohexenecarbonitrile

2,4-DIMETHYL CYCLOHEXENECARBONITRILE

3.5

A synthetic scent ingredient that adds a fresh, citrus note but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Hair conditioning agent

Dimethyl Diacetyl Cystinate

Dimethyl Diacetyl Cystinate

4.0

A gentle, science-backed ingredient that helps rebuild damaged hair from the inside out by delivering cysteine, a key building block of hair proteins.

Irritation

low

Source

semi-synthetic

beautyskincarehair care
Read ingredient review

Fragrance Ingredient

Dimethyl Dioxaspiro Undecane

3,3-DIMETHYL-1,5-DIOXASPIRO-UNDECANE

3.8

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Propellant

Dimethyl Ether

DIMETHYL ETHER

3.5

Dimethyl ether is a common aerosol propellant that helps dispense products like dry shampoos and setting sprays, but it offers no direct skin benefit and may cause mild irritation if inhaled excessively.

Irritation

low

Source

synthetic

beautyskincarepropellant
Read ingredient review

Skin Conditioning

Dimethyl Glutamic Acid

Dimethyl Glutamic Acid

4.0

A gentle, water-attracting ingredient that helps keep skin hydrated and smooth without irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Solvent

Dimethyl Glutarate

Dimethyl Glutarate

3.5

Dimethyl Glutarate is a gentle synthetic solvent that helps products spread and feel smooth, but it offers no direct skin benefits beyond formulation.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Fragrance Ingredient

Dimethyl Hexenyl Dihydrofuranone

DIMETHYL-4-HEXENYL-DIHYDROFURANONE

3.5

A synthetic fragrance compound that adds scent but offers no skincare benefits; safe at low levels but may irritate sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Conditioning Agent

Dimethyl Hydrogenated Tallowamine

Dimethyl Hydrogenated Tallowamine

3.5

A conditioning agent that can soften hair and skin but may be too heavy for oily or acne-prone types.

Irritation

moderate

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Preservative Booster

Dimethyl Imidazolidinone

DIMETHYL IMIDAZOLIDINONE

3.5

A synthetic ingredient that helps preserve formulas and improve feel, but it's not a primary preservative and has limited research on long-term skin effects.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

pH Adjuster

Dimethyl Isopropanolamine

Dimethyl Isopropanolamine

3.5

Dimethyl Isopropanolamine is a synthetic pH adjuster that helps keep products stable and gentle, but it can be irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Solvent

Dimethyl Isosorbide

Dimethyl Isosorbide

4.3

A gentle, non-drying solvent that helps other ingredients work better without leaving a greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincaresolvent
Read ingredient review

Foam Booster

Dimethyl Lauramide/Myristamide

Dimethyl Lauramide/Myristamide

3.5

A synthetic foam booster that improves lather and thickness in cleansers, but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Dimethyl Lauramine

Dimethyl Lauramine

3.5

Dimethyl Lauramine is a synthetic emulsifier and pH adjuster that helps blend oil and water in rinse-off cleansers, but it may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

Dimethyl Lauramine Oleate

Dimethyl Lauramine Oleate

3.5

A synthetic emulsifier that helps mix oil and water, but may be slightly drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Fragrance Ingredient

Dimethyl Maleate

Dimethyl Maleate

3.5

Dimethyl Maleate is a synthetic fragrance ingredient with limited skincare benefits; it may cause irritation in sensitive individuals and is best avoided in leave-on products for reactive skin.

Irritation

moderate

Source

synthetic

beautyskincarefragrance ingredient
Read ingredient review

Solvent

Dimethyl Malonate

DIMETHYL MALONATE

3.5

Dimethyl Malonate is a synthetic solvent and fragrance ingredient with minimal research on skin benefits; it's generally safe at low levels but offers no active skincare value.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Skin conditioning agent

Dimethyl MEA

Dimethyl MEA

3.8

Dimethyl MEA can temporarily tighten and firm skin, but results are short-lived and may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarefirming agent
Read ingredient review

Solvent

Dimethyl Methylglutarate

Dimethyl Methylglutarate

3.5

A synthetic ester that helps other ingredients dissolve and spread smoothly, but offers little direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review

Emulsifier

Dimethyl Myristamine

Dimethyl Myristamine

3.5

An effective emulsifier and surfactant for rinse-off products, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Fragrance Ingredient

Dimethyl Octanenitrile

3,7-DIMETHYL-OCTANENITRILE

3.5

A synthetic scent ingredient that adds a fresh, citrusy note but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Humectant

Dimethyl Octene Diol

DIMETHYL-7-OCTENE-1,6-DIOL

3.8

A gentle, synthetic humectant that helps hydrate skin without the stickiness of glycerin, but research on its long-term benefits is still limited.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Fragrance Ingredient

Dimethyl Octenol

2,6-DIMETHYL-7-OCTEN-2-OL

3.5

A synthetic scent ingredient that adds a fresh, citrusy note but offers no skincare benefit and may be a concern for those sensitive to fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Octyl Acetate

3,6-DIMETHYL-3-OCTYL ACETATE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Stabilizer

Dimethyl Octynediol

Dimethyl Octynediol

3.5

A synthetic stabilizer that helps keep formulas consistent but may cause irritation in sensitive skin at higher levels.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Fragrance Ingredient

Dimethyl Oxalate

Dimethyl Oxalate

2.5

Dimethyl oxalate is a synthetic ester used mainly as a fragrance ingredient; it has limited direct skincare benefits and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Film Former

Dimethyl Oxobenzo Dioxasilane

Dimethyl Oxobenzo Dioxasilane

3.5

A synthetic silicone that helps products spread smoothly and leaves a soft, non-greasy finish, but has limited published research on its long-term effects.

Irritation

low

Source

synthetic

beautyskincarefilm former
Read ingredient review

UV Filter

Dimethyl PABA Ethyl Cetearyldimonium Tosylate

Dimethyl PABA Ethyl Cetearyldimonium Tosylate

3.5

A synthetic UV filter and conditioner with moderate safety concerns; less common in modern formulations due to potential irritation and environmental persistence.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Emulsifier

Dimethyl Palmitamine

Dimethyl Palmitamine

3.5

A synthetic conditioning agent that helps soften hair and stabilize formulas, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Fragrance ingredient

Dimethyl Phenethyl Butyrate

DIMETHYL PHENETHYL BUTYRATE

3.5

A synthetic fragrance ester that adds a pleasant scent but offers no skincare benefits; generally safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylbutanol

Dimethyl Phenylbutanol

3.5

A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefits and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylethyl Carbinyl Acetate

DIMETHYL PHENYLETHYL CARBINYL ACETATE

3.5

A synthetic fragrance ingredient that adds a floral, rosy scent; generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylpropanol

Dimethyl Phenylpropanol

3.5

A synthetic floral scent ingredient that is generally considered safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenylpropanol Isobutyrate

1,1-DIMETHYL-3-PHENYLPROPYL ISOBUTYRATE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Phenyltetrahydrofuran

2,4-DIMETHYL-4-PHENYLTETRAHYDROFURAN

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emulsifier

Dimethyl Soyamine

Dimethyl Soyamine

3.5

A plant-derived emulsifier that helps blend oils and water, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincaresurfactant
Read ingredient review

Emulsifier

Dimethyl Stearamine

Dimethyl Stearamine

3.5

An effective emulsifier and hair conditioner, but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Skin Conditioning

Dimethyl Succinate

Dimethyl Succinate

3.5

A mild synthetic ester that helps other ingredients absorb and leaves skin feeling smooth, but offers no direct active benefits.

Irritation

low

Source

synthetic

beautyskincaresolvent
Read ingredient review