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

Humectant

Glyceryl Starch

GLYCERYL STARCH

4.2

Glyceryl starch is a gentle, non-sticky humectant that helps hydrate the skin by attracting moisture, making it a good option for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Emulsifier

Glyceryl Stearate

Glyceryl Stearate

4.5

A gentle, widely used emulsifier that helps create smooth, stable creams and lotions with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Glyceryl Stearate Citrate

Glyceryl Stearate Citrate

4.5

A mild, plant-derived emulsifier that helps create stable, creamy textures without common irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Glyceryl Stearate Lactate

Glyceryl Stearate Lactate

4.3

A mild, lactic-acid-derived emulsifier that helps blend oil and water while offering light moisturizing benefits.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Glyceryl Stearate SE

Glyceryl Stearate SE

4.0

A gentle, self-emulsifying ingredient that helps create smooth, stable creams and lotions without harsh surfactants.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Glyceryl Stearate Succinate

Glyceryl Stearate Succinate

4.0

A mild, non-irritating emulsifier that helps create stable, creamy textures without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Glyceryl Stearate/Acetate

GLYCERYL STEARATE/ACETATE

4.0

A gentle emulsifier that helps create stable, smooth creams and lotions with minimal irritation risk.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Glyceryl Stearate/Malate

Glyceryl Stearate/Malate

4.0

A gentle, dual-purpose emollient that hydrates and lightly exfoliates, making it a good choice for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

Glyceryl Tallowate

Glyceryl Tallowate

3.5

Glyceryl Tallowate is a natural emollient that softens skin but may clog pores for some, and its animal-derived origin raises ethical and sustainability questions.

Irritation

low

Source

natural

beautyskincareemollient
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Reducing agent

Glyceryl Thioglycolate

GLYCERYL THIOGLYCOLATE

3.0

A strong chemical used to break and reform hair bonds for perms or straightening; not for everyday use and requires professional handling.

Irritation

high

Source

synthetic

beautyhaircarereducing agent
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Antioxidant

Glyceryl Thiopropionate

Glyceryl Thiopropionate

3.5

A synthetic antioxidant that may help protect skin from oxidative stress, but research is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Emollient

Glyceryl Undecylenate

Glyceryl Undecylenate

4.3

A mild, multifunctional ingredient that softens skin and helps keep products fresh without harsh preservatives.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Antioxidant

Glyceryl/Erythorbyl Laurate

Glyceryl/Erythorbyl Laurate

4.0

A gentle, stable vitamin C ester that brightens skin and fights free radicals without the irritation of pure ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Film Former

Glycidoxy Dimethicone

GLYCIDOXY DIMETHICONE

3.5

A reactive silicone that helps products spread smoothly and form a flexible film, but its epoxy group raises some formulation and safety considerations.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Film Former

Glycidoxypropyl Silanetriol

GLYCIDOXYPROPYL SILANETRIOL

3.5

A synthetic silicone compound that helps other ingredients stick to hair or skin and creates a smooth, non-greasy feel.

Irritation

low

Source

synthetic

beautyskincarefilm former
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Film Former

Glycidoxypropyl Trimethoxysilane

GLYCIDOXYPROPYL TRIMETHOXYSILANE

3.5

A synthetic silicone compound that helps other ingredients stick to skin, hair, or nails, but may cause irritation in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarefilm-former
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Film Former

Glycidyl Neodecanoate Crosspolymer

GLYCIDYL NEODECANOATE/PHTHALIC ANHYDRIDE/TMP CROSSPOLYMER

3.5

A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Humectant

Glycine

Glycine

4.0

Glycine is a gentle amino acid that hydrates and supports skin's natural repair processes, making it a safe addition to most routines.

Irritation

low

Source

natural

beautyskincarehumectant
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Solvent

Glycofurol

GLYCOFUROL

3.5

Glycofurol is a synthetic solvent that helps other ingredients absorb into skin, but it may cause irritation for sensitive types.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Humectant

Glycogen

Glycogen

4.0

Glycogen is a gentle humectant that helps hydrate and plump the skin by drawing moisture from the air and supporting the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Glycol

Glycol

3.5

Glycol is a catch-all term for humectant solvents that help hydrate and improve product texture, but its specific effects depend on the exact glycol used.

Irritation

low

Source

synthetic

beautyskincarehumectant
Read ingredient review

Emulsifier

Glycol Cetearyl Ester

Glycol Cetearyl Ester

4.0

A gentle emulsifier that helps your creams feel rich and stable without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Glycol Dibehenate

Glycol Dibehenate

4.0

A gentle, synthetic wax that gives creams and balms a smooth, silky feel without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Plasticizer

Glycol Dibenzoate Blend

DIETHYLENE GLYCOL/PROPYLENE GLYCOL/DIPROPYLENE GLYCOL DIBENZOATE

3.5

A synthetic plasticizer that helps nail polishes and other products form flexible, durable films — generally safe at low levels but not a skincare active.

Irritation

low

Source

synthetic

beautyskincarenail care
Read ingredient review

Emollient

Glycol Dilaurate

Glycol Dilaurate

4.0

A gentle synthetic emollient that helps products feel smooth and spread easily, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Film Former

Glycol Dimethacrylate

Glycol Dimethacrylate

3.5

Glycol Dimethacrylate is a synthetic ingredient used mainly in nail products to improve durability, but it can cause skin irritation or allergic reactions in some people.

Irritation

moderate

Source

synthetic

beautynail-carepolymer
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Emollient

Glycol Dipivalate

GLYCOL DIPIVALATE

4.0

A lightweight synthetic emollient that helps products feel silky and spread easily, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Glycol Distearate

Glycol Distearate

4.0

Glycol Distearate is a safe, synthetic ingredient that gives products a pearly look and a silky feel without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Glycol Ditallowate

Glycol Ditallowate

3.5

A gentle emollient that softens skin and thickens formulas, but may be too heavy for oily or acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

Glycol Ester Blend

Glycol Dipalmate/Palm Kernelate/Olivate/Macadamiate

3.8

A gentle emollient blend that softens skin but may be slightly pore-clogging for acne-prone types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

Glycol Montanate

Glycol Montanate

3.8

A gentle wax ester that helps thicken and stabilize products while providing a smooth, non-greasy feel.

Irritation

low

Source

natural

beautyskincareemollient
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Emulsifier

Glycol Oleate

Glycol Oleate

3.5

Glycol Oleate helps blend oil and water in creams and lotions, but may be slightly pore-clogging for acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Glycol Palmitate

Glycol Palmitate

3.8

Glycol Palmitate is a gentle emollient that helps soften and smooth the skin, but it offers no active benefits beyond basic moisturizing.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Film Former

Glycol Rosinate

Glycol Rosinate

3.5

Glycol Rosinate helps makeup stay put and resist water, but may clog pores for some skin types.

Irritation

low

Source

natural

beautyskincarefilm-former
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Exfoliant

Glycol Salicylate

Glycol Salicylate

4.0

A milder cousin of salicylic acid that exfoliates and smooths skin with less irritation.

Irritation

low

Source

synthetic

beautyskincareexfoliant
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Emulsifier

Glycol Stearate

Glycol Stearate

4.0

Glycol Stearate is a safe, mild emulsifier that helps blend oil and water in creams and gives them a pearly, luxurious look.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

Glycol Stearate SE

Glycol Stearate SE

4.0

A gentle emulsifier that helps oil and water mix in your creams, giving them a smooth, pearly texture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Surfactant

Glycol Tallate

Glycol Tallate

3.5

An effective cleansing agent from tall oil, but may be drying for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleansing agent
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Film Former

Glycol/Sebacic Acid Copolymer

GLYCOL/SEBACIC ACID COPOLYMER

3.8

A synthetic polymer that helps products stay put and resist water, generally considered safe and non-irritating.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

Glycolamide Stearate

Glycolamide Stearate

3.8

Glycolamide Stearate is a gentle emollient that helps moisturize and condition skin without clogging pores, making it suitable for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Exfoliant

Glycolic Acid

Glycolic Acid

4.2

Glycolic acid is a well-researched exfoliant that smooths skin and boosts collagen, but it can cause irritation if overused or used at too high a concentration.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Film Former

Glycolide

Glycolide

2.0

Glycolide is not a direct skincare active; it is a synthetic building block for biodegradable polymers that may appear in advanced formulations but offers no proven direct benefit to skin.

Irritation

low

Source

synthetic

beautyskincarepolymer precursor
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