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 842
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

Film Former

Glyceryl Hydrogenated Rosinate

Glyceryl Hydrogenated Rosinate

3.5

A pine-derived film former that helps makeup and sunscreens stay put, but may feel heavy on some skin types.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Film Former

Glyceryl Polyacrylate

Glyceryl Polyacrylate

4.0

A safe, synthetic film-former that gives water-based products a silky, non-greasy feel and helps other ingredients stay on skin longer.

Irritation

low

Source

synthetic

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Film Former

Glyceryl Polyisobutenylsuccinate

GLYCERYL POLYISOBUTENYLSUCCINATE

4.0

A gentle film former that helps products stay put and resist water, commonly found in sunscreens and long-wear makeup.

Irritation

low

Source

synthetic

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Film Former

Glyceryl Polymethacrylate

GLYCERYL POLYMETHACRYLATE

4.0

A gentle synthetic polymer that improves product feel and helps other ingredients stay on the skin longer.

Irritation

low

Source

synthetic

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Film Former

Glyceryl PPG-16/SMDI Copolymer

GLYCERYL PPG-16/SMDI HEA/HYDROXYISOPROPYL METHACRYLATE

3.5

A synthetic polymer that helps makeup and skincare products stay put and feel smooth, but it's not a hydrating or active ingredient.

Irritation

low

Source

synthetic

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Film Former

Glyceryl Rosinate

Glyceryl Rosinate

3.5

Glyceryl Rosinate is a natural film-forming ingredient that helps makeup and hair products last longer, but it may cause sensitivity in those allergic to pine or tree resins.

Irritation

low

Source

natural

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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

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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

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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

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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

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Film-Former

Gutta Percha

PALAQUIUM GUTTA

3.2

Gutta percha is a natural latex that can help products form a flexible film, but it is uncommon in modern skincare and may cause sensitivity in those with latex allergies.

Irritation

low

Source

natural

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Humectant

Hagfish Mucus Extract

Inshore Hagfish Skin Mucus Extract

3.5

Hagfish mucus extract is an experimental marine ingredient with promising hydrating and film-forming abilities, but it's very new to cosmetics and lacks broad safety and efficacy data.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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Film Former

HDI Alkyl Tartrate Copolymer

HDI/DI-C12-14 ALKYL TARTRATE/HYDROGENATED DILINOLEYL ALCOHOL COPOLYMER

3.8

A synthetic film-former that helps makeup last longer and resist water, but may feel heavy on some skin types.

Irritation

low

Source

synthetic

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Film Former

HDI/PPG/Polycaprolactone Crosspolymer

HDI/PPG/Polycaprolactone Crosspolymer

4.0

A gentle synthetic film-former that helps makeup and skincare products feel smooth, last longer, and resist water without clogging pores.

Irritation

low

Source

synthetic

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Film Former

Hea Succinate

Hea Succinate

3.8

Hea Succinate is a synthetic film-former that helps products spread smoothly and feel lightweight on skin, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Heptyl Methacrylate

HEPTYL METHACRYLATE

3.0

Heptyl Methacrylate is a synthetic film-forming ingredient that helps create durable, glossy coatings in nail products, but it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefilm-former
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Film Former

Hexadecenyl Oleylsuccinamide

HEXADECENYL OLEYLSUCCINAMIDE

3.5

A synthetic film-former that helps products stay put on skin and hair, but it's not a star ingredient for most routines.

Irritation

low

Source

synthetic

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Film Former

Hexadecenyl Stearylsuccinamide

HEXADECENYL STEARYLSUCCINAMIDE

3.5

A synthetic film-former that helps products stay put and resist water, but it's not a hero ingredient—just a functional helper.

Irritation

low

Source

synthetic

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Film Former

Hexyl Methacrylate

Hexyl Methacrylate

3.5

Hexyl Methacrylate is a synthetic film-former that helps products adhere and last longer, but it can be a skin sensitizer for some people.

Irritation

moderate

Source

synthetic

beautyskincarefilm-former
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Film Former

Hexylene Glycol Copolymer

HEXYLENE GLYCOL/NEOPENTYL GLYCOL/ADIPIC ACID/SMDI/DMPA COPOLYMER

3.8

A synthetic film-former that helps makeup and skincare last longer, but may feel heavy on some skin types.

Irritation

low

Source

synthetic

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Film Former

Hydrocarbon Copolymer Blend

C5-6 Olefin/C8-10 Naphtha Olefin Copolymer

3.5

A synthetic polymer that helps makeup last longer and feel smoother, but offers no skincare benefit.

Irritation

low

Source

synthetic

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Film Former

Hydrogen Dimethicone

Hydrogen Dimethicone

4.0

Hydrogen Dimethicone is a gentle silicone that smooths and protects skin and hair without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincarehaircarefilm-former
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Film Former

Hydrogenated Styrene Copolymer

HYDROGENATED DICYCLOPENTADIENE/ISOPENTENE/ISOPRENE/STYRENE COPOLYMER

3.8

A synthetic polymer that helps makeup last longer and resist water, but may feel heavy on some skin types.

Irritation

low

Source

synthetic

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Film Former

Hydrolyzed Bladderwrack Protein

Hydrolyzed Fucus Vesiculosus Protein

4.0

A gentle, protein-rich seaweed derivative that helps hydrate and form a protective film on the skin, but evidence is mostly based on whole seaweed extracts rather than this specific hydrolyzed protein.

Irritation

low

Source

natural

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Film Former

Hydrolyzed Calf Skin

HYDROLYZED CALF SKIN

3.5

Hydrolyzed calf skin is a protein ingredient that can temporarily plump and smooth skin, but its animal origin and limited evidence for long-term benefits may not suit everyone.

Irritation

low

Source

natural

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Film Former

Hydrolyzed Carnauba Wax

Hydrolyzed Carnauba Wax

3.8

A gentle, plant-derived film-former that helps lock in moisture and smooth the skin's surface without clogging pores.

Irritation

low

Source

natural

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Film-Forming Agent

Hydrolyzed Conalbumin

Hydrolyzed Conalbumin

3.5

Hydrolyzed conalbumin is a gentle egg-derived protein that forms a light film on skin to help retain moisture and temporarily smooth fine lines.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Erythrina Edulis Seed

Hydrolyzed Erythrina Edulis Seed

3.8

A gentle plant protein that helps hydrate and temporarily smooth the skin's surface, though research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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Film-Former

Hydrolyzed Fish Scale Extract

HYDROLYZED FISH SCALE EXTRACT

3.5

A novel marine-derived protein that may help smooth and hydrate skin, but research is limited and it's not a must-have ingredient.

Irritation

low

Source

natural

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Film-Former

Hydrolyzed Furcellaran

HYDROLYZED FURCELLARAN

4.0

A gentle seaweed-derived film-former that helps skin feel smooth and hydrated without clogging pores.

Irritation

low

Source

natural

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