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

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
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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
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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
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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

Solvent

Dimethyl Sulfide

Dimethyl Sulfide

3.0

Dimethyl sulfide is a sulfur compound used mainly as a solvent or to mask odors in cosmetics; it has limited research on direct skin benefits and may cause irritation at higher concentrations.

Irritation

moderate

Source

natural

beautyskincaresolvent
Read ingredient review

Anti-inflammatory

Dimethyl Sulfone

DIMETHYL SULFONE

4.0

A gentle sulfur compound that may help calm redness and support collagen production, but more human studies are needed to confirm its topical benefits.

Irritation

low

Source

natural

beautyskincareanti-inflammatory
Read ingredient review

Emulsifier

Dimethyl Tallowamine

Dimethyl Tallowamine

2.5

An old-school emulsifier from animal fat that can be effective but may cause irritation and is rarely used in modern clean beauty.

Irritation

moderate

Source

natural

beautyskincareemulsifier
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Fragrance Ingredient

Dimethyl Vinyl Heptenol

3,6-DIMETHYL-3-VINYLHEPT-5-EN-2-OL

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Vinylhexenal

2,5-DIMETHYL-2-VINYLHEX-4-ENAL

3.5

A synthetic fragrance compound that adds a fresh scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl Vinyloctenol

4,7-DIMETHYL-4-VINYLOCT-6-EN-3-OL

3.5

A synthetic scent ingredient that adds a pleasant aroma but offers no skin benefit; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl-3-Butenyl Isobutyrate

DIMETHYL-3-BUTENYL ISOBUTYRATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl-4-Isoheptenal Dimethyl Acetal

DIMETHYL-4-ISOHEPTENAL DIMETHYL ACETAL

3.5

A synthetic fragrance ingredient that adds a fresh scent but offers no skin benefit and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethyl-5-Hexenyl Acetate

DIMETHYL-5-HEXENYL ACETATE

3.5

A synthetic fragrance compound that adds a fruity note to products, but offers no skincare benefit and may be a concern for those with fragrance sensitivity.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Film Former

Dimethylacrylamide

Dimethylacrylamide

3.5

A synthetic film-former that helps products spread smoothly and feel lightweight, but its safety data is limited to general polymer use.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Film Former

Dimethylamine/Epichlorohydrin Copolymer

DIMETHYLAMINE/ETHYLENEDIAMINE/EPICHLOROHYDRIN COPOLYMER

3.5

A synthetic polymer that helps hair feel smooth and products spread evenly, but it's not a standout ingredient and may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm-former
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pH Adjuster

Dimethylamino Methylpropanol

Dimethylamino Methylpropanol

3.8

A synthetic pH adjuster that helps keep formulas stable and gentle, but can be irritating in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Skin conditioning agent

Dimethylaminoethanol Tartrate

DIMETHYLAMINOETHANOL TARTRATE

3.5

DMAE tartrate can give a temporary firming sensation, but results are short-lived and may cause irritation for some.

Irritation

moderate

Source

semi-synthetic

beautyskincareanti-aging
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Hair Conditioning Agent

Dimethylaminoethyl Rice Branate

Dimethylaminoethyl Rice Branate

4.0

A gentle, rice-derived conditioning ingredient that helps detangle hair and soften skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

pH Adjuster

Dimethylaminopropylamine

Dimethylaminopropylamine

2.5

Dimethylaminopropylamine is a synthetic pH adjuster and intermediate, but it can be a skin sensitizer and is rarely used as a standalone ingredient in leave-on skincare.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Antioxidant

Dimethylaminopropylamino Hypocrellin B

Dimethylaminopropylamino Hypocrellin B

2.5

An experimental ingredient with potential light-activated benefits, but lacks sufficient safety and efficacy data for routine cosmetic use.

Irritation

moderate

Source

semi-synthetic

beautyskincareactive
Read ingredient review

Fragrance Ingredient

Dimethylbenzyl Carbinol

DIMETHYLBENZYL CARBINOL

3.5

A synthetic floral scent ingredient that adds a pleasant rose note but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbenzyl Carbinyl Acetate

DIMETHYLBENZYL CARBINYL ACETATE

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Dimethylbenzyl Carbinyl Propionate

DIMETHYLBENZYL CARBINYL PROPIONATE

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review