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

Emollient

Dimethiconol

Dimethiconol

4.0

Dimethiconol is a gentle silicone that smooths skin and hair without clogging pores, making it a safe choice for most skin types.

Irritation

low

Source

synthetic

beautyskincarehaircareemollient
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Hair Conditioner

Dimethiconol Arginine

Dimethiconol Arginine

3.8

A gentle silicone-arginine hybrid that smooths hair and skin without heavy buildup, but may not suit those avoiding silicones entirely.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Emollient

Dimethiconol Beeswax

Dimethiconol Beeswax

4.0

A silicone-infused wax that gives products a silky, smooth feel without the heavy greasiness of traditional waxes.

Irritation

low

Source

semi-synthetic

beautyskincareemollientfilm-former
Read ingredient review

Emollient

Dimethiconol Behenate

Dimethiconol Behenate

4.0

A gentle silicone ester that smooths skin and locks in moisture without feeling heavy or greasy.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Skin conditioner

Dimethiconol Borageate

Dimethiconol Borageate

4.0

A gentle silicone-oil hybrid that smooths skin and hair without heavy greasiness, with added fatty acid benefits from borage oil.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Emollient

Dimethiconol Candelillate

Dimethiconol Candelillate

4.0

A gentle silicone-wax hybrid that gives products a silky, non-greasy feel and helps them stay put.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Film Former

Dimethiconol Carnaubate

Dimethiconol Carnaubate

4.0

A gentle silicone wax that helps makeup and skincare last longer without feeling heavy or greasy.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
Read ingredient review

Hair Conditioning Agent

Dimethiconol Cysteine

Dimethiconol Cysteine

3.8

A silicone-cysteine hybrid that helps smooth hair and reduce frizz with a lighter feel than traditional silicones.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review

Emollient

Dimethiconol Hydroxystearate

DIMETHICONOL HYDROXYSTEARATE

4.0

A gentle silicone derivative that improves product feel and spreadability, suitable for most skin types including sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

Dimethiconol Isostearate

Dimethiconol Isostearate

4.0

A gentle silicone ester that smooths skin and hair without heavy greasiness, but offers limited active benefits beyond surface feel.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Emollient

Dimethiconol Kokum Butterate

Dimethiconol Kokum Butterate

4.0

A gentle, silicone-like emollient that softens skin without greasiness, ideal for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dimethiconol Lactate

Dimethiconol Lactate

4.0

A hybrid silicone-lactic acid ingredient that smooths skin and provides light moisture without heavy residue.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Skin Conditioning Agent

Dimethiconol Meadowfoamate

Dimethiconol Meadowfoamate

4.0

A gentle, silicone-based emollient that softens skin and hair without greasiness, ideal for dry or sensitive types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Hair Conditioner

Dimethiconol Methionine

Dimethiconol Methionine

4.0

A gentle silicone-amino acid hybrid that smooths hair and softens skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Conditioning Agent

Dimethiconol Panthenol

Dimethiconol Panthenol

4.0

A gentle silicone-panthenol hybrid that smooths hair and skin while adding a touch of moisture, but may feel heavy for fine hair or oily skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Emollient

Dimethiconol Sal Butterate

Dimethiconol Sal Butterate

4.0

A lightweight silicone ester that provides a silky, smooth feel without heavy greasiness, making it a popular choice for modern formulations.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Dimethiconol Stearate

DIMETHICONOL STEARATE

4.0

A gentle silicone-based emollient that helps products glide on smoothly without clogging pores, making it a good option for sensitive or acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Absorbent

Dimethiconol/Silica Crosspolymer

DIMETHICONOL/SILICA CROSSPOLYMER

4.0

A silicone powder that soaks up excess oil and gives a silky, non-greasy feel—great for shine control and blurring pores.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Dimethiconyl Silicate

Dimethiconyl Silicate

4.0

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

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Antioxidant

Dimethoxy Di-P-Cresol

Dimethoxy Di-P-Cresol

3.8

A synthetic antioxidant that may help protect skin from environmental damage, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Dimethoxyapigenin

Dimethoxyapigenin

3.8

A synthetic antioxidant that may help calm skin and fight free radicals, but research is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Dimethoxybenzyl Alcohol

Dimethoxybenzyl Alcohol

4.0

A mild synthetic fragrance ingredient that also helps preserve formulas, generally considered safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin brightener

Dimethoxyphenethyl Resorcinol

Dimethoxyphenethyl Resorcinol

4.0

A potent synthetic brightener that targets dark spots by blocking melanin production, but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarebrightening agent
Read ingredient review

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

Hair colorant

Dimethoxypyridinediamine HCl

2,6-DIMETHOXY-3,5-PYRIDINEDIAMINE HCL

2.5

A synthetic dye ingredient used in hair color; can cause skin irritation in sensitive individuals and is not used in leave-on skincare.

Irritation

moderate

Source

synthetic

beautyhair colorsynthetic dye
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

Plasticizer

Dimethyl 2,6-Naphthalate

DIMETHYL 2,6-NAPHTHALATE

2.5

An industrial plasticizer rarely used in leave-on skincare; best avoided for daily facial care due to limited safety data and potential irritation.

Irritation

moderate

Source

synthetic

beautynail caresolvent
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