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 569
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

Hair conditioning agent

Quaternium-79 Hydrolyzed Keratin

Quaternium-79 Hydrolyzed Keratin

4.0

A gentle, protein-based conditioner that helps strengthen hair and reduce frizz without weighing it down.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Quaternium-79 Hydrolyzed Milk Protein

QUATERNIUM-79 HYDROLYZED MILK PROTEIN

3.8

A gentle conditioning ingredient that makes hair and skin feel softer and more manageable without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-82

Quaternium-82

3.5

Quaternium-82 is a synthetic conditioning ingredient that helps reduce static and improve hair feel, but it may build up on fine or low-porosity hair over time.

Irritation

low

Source

synthetic

beautyskincarehair careconditioning agent
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Antistatic Agent

Quaternium-84

Quaternium-84

3.5

A synthetic conditioning ingredient that helps reduce flyaways and static in hair, generally considered safe for most users.

Irritation

low

Source

synthetic

beautyskincarehair careconditioning agent
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Antistatic Agent

Quaternium-85

Quaternium-85

3.8

A gentle synthetic conditioner that smooths hair and reduces static, but may build up with frequent use.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-88

Quaternium-88

4.0

Quaternium-88 is a gentle conditioning polymer that smooths hair and skin without heavy buildup, making it a popular choice for sensitive scalps and fine hair.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-89

Quaternium-89

4.0

A gentle synthetic conditioning agent that reduces frizz and static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Quaternium-91

Quaternium-91

3.8

A gentle synthetic conditioner that helps detangle hair and reduce flyaways without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-96

Quaternium-96

3.8

A synthetic conditioning agent that helps reduce static and improve the feel of hair and skin, generally well-tolerated but not a standout active.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Quaternium-97

Quaternium-97

3.8

Quaternium-97 is a synthetic conditioning ingredient that helps reduce frizz and static while making hair feel softer and easier to manage.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Humectant

R-Saccharomyces Polypeptide-1

R-SACCHAROMYCES POLYPEPTIDE-1

4.0

A gentle, yeast-derived peptide that helps hydrate and support the skin barrier, but research is still emerging.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Skin Conditioning Agent

Rapeseed Gamma-Lactone

RAPESEED GAMMA-LACTONE

3.8

A gentle, plant-derived ingredient that helps soften and smooth skin with minimal irritation risk.

Irritation

low

Source

natural

beautyskincareconditioning agent
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Humectant

Rhizopus/Saccharomyces Collagen Ferment Filtrate

RHIZOPUS/SACCHAROMYCES/COLLAGEN FERMENT FILTRATE

3.8

A fermented collagen ingredient that may help hydrate and condition skin, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Skin conditioning agent

Rice Bran Ferment

SACCHAROMYCES/DEFATTED RICE BRAN FERMENT

4.0

A gentle, fermented ingredient that helps hydrate and condition skin, with some antioxidant benefits from the fermentation process.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Skin conditioning agent

Rice Bran Ferment Extract

AUREOBASIDIUM PULLULANS/RICE BRAN FERMENT

4.0

A gentle fermented rice bran extract that supports skin barrier function and provides antioxidant benefits, suitable for most skin types.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Humectant

Rice Ferment Filtrate

SACCHAROMYCES/RICE KERNEL FERMENT

4.2

A gentle, fermented rice ingredient that hydrates, lightly exfoliates, and supports a smoother, more even-looking complexion.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Conditioning Agent

Ricinolamidopropyl Dimethylamine

RICINOLEAMIDOPROPYL DIMETHYLAMINE

4.0

A gentle, castor-oil-derived conditioning agent that softens hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Ricinolamidopropyl Dimethylamine Lactate

RICINOLEAMIDOPROPYL DIMETHYLAMINE LACTATE

4.0

A gentle, castor-oil-derived conditioning ingredient that smooths hair without heavy buildup, ideal for fine or oily hair types.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Skin conditioning agent

S-Syringoyl Acetyl Methyl Cysteinate

S-Syringoyl Acetyl Methyl Cysteinate

3.8

A gentle, synthetic amino acid derivative that may help calm skin and support barrier repair, though research is still emerging.

Irritation

low

Source

synthetic

beautyskincareconditioning agent
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Humectant

Saccharomyces/Magnesium Ferment

SACCHAROMYCES/MAGNESIUM FERMENT

4.0

A gentle, biotech-derived ferment that pairs yeast metabolites with magnesium to support hydration and a healthy-looking skin barrier.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Skin conditioning agent

Saccharomyces/Silicon Ferment

SACCHAROMYCES/SILICON FERMENT

4.0

A gentle, biotech-derived ingredient that combines yeast ferment with silicon to support skin comfort and a healthy-looking barrier.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Humectant

Sea Silt Ferment

SACCHAROMYCES/SEA SILT FERMENT

4.0

A gentle fermented ingredient that may help hydrate and support the skin barrier, but research is still limited.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
Read ingredient review

Skin conditioning agent

Sheep Skin Lysate

SHEEP SKIN LYSATE

3.5

A novel ingredient from sheep skin that may support skin repair, but research is very limited and it's not a proven must-have.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Film Former

Silanetriol

Silanetriol

4.0

Silanetriol is a gentle, water-soluble silicon ingredient that helps improve skin firmness and hydration without clogging pores.

Irritation

low

Source

synthetic

beautyskincareconditioning agent
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Humectant

Silanetriol Arginine Complex

Silanetriol Argininate

4.0

A gentle, water-soluble silicon complex that helps hydrate and support skin barrier function without the stickiness of some silicones.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin conditioning agent

Silanetriol Glutamate

SILANETRIOL GLUTAMATE

4.0

A gentle, water-soluble silicon compound that helps support skin firmness and hydration without irritation.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Antistatic Agent

Silicone Quaternium-1

Silicone Quaternium-1

4.0

A gentle, water-soluble silicone that smooths hair and skin without the heavy feel of traditional silicones.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Hair Conditioning Agent

Silicone Quaternium-10

Silicone Quaternium-10

4.0

Silicone Quaternium-10 is a gentle conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-12

Silicone Quaternium-12

4.0

Silicone Quaternium-12 is a gentle conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Conditioning Agent

Silicone Quaternium-16

Silicone Quaternium-16

4.0

Silicone Quaternium-16 is a gentle conditioning ingredient that smooths hair and skin without heavy buildup, but it may not suit those avoiding silicones entirely.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-16 Crosspolymer

Silicone Quaternium-16/Glycidoxy Dimethicone Crosspolymer

4.0

A gentle, positively charged silicone that smooths hair and reduces static without the heavy feel of traditional silicones.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-17

Silicone Quaternium-17

3.8

A gentle conditioning silicone that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-18

Silicone Quaternium-18

4.0

Silicone Quaternium-18 is a gentle conditioning ingredient that smooths hair and reduces static, but may build up over time with infrequent washing.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-2

Silicone Quaternium-2

3.8

Silicone Quaternium-2 is a gentle, positively charged silicone that smooths hair and reduces frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Hair Conditioner

Silicone Quaternium-2 Panthenol Succinate

Silicone Quaternium-2 Panthenol Succinate

4.0

A gentle conditioning ingredient that helps detangle hair and soften skin without heavy buildup, thanks to its silicone and panthenol components.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-20

Silicone Quaternium-20

3.8

A gentle conditioning silicone that smooths hair and reduces static, but may build up on fine or low-porosity hair over time.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-21

Silicone Quaternium-21

4.0

A gentle silicone conditioner that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Silicone Quaternium-22

Silicone Quaternium-22

4.0

A gentle silicone conditioner that smooths hair without heavy buildup, ideal for fine or oily hair types.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Conditioning Agent

Silicone Quaternium-26

Silicone Quaternium-26

3.8

A gentle silicone conditioner that smooths hair without heavy buildup, but may not suit very fine or low-porosity hair.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-27

Silicone Quaternium-27

4.0

A gentle, water-soluble silicone that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-3

Silicone Quaternium-3

3.8

Silicone Quaternium-3 is a gentle conditioning ingredient that helps detangle and soften hair without heavy buildup, but may not suit very fine or low-porosity hair if used excessively.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Silicone Quaternium-4

Silicone Quaternium-4

4.0

A gentle silicone that smooths hair and fights frizz without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-5

Silicone Quaternium-5

4.0

A gentle silicone conditioner that smooths hair and skin without heavy buildup, ideal for fine or oily hair types.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Conditioning agent

Silicone Quaternium-6

Silicone Quaternium-6

3.8

A gentle silicone derivative that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Hair Conditioning Agent

Silicone Quaternium-7

Silicone Quaternium-7

4.0

Silicone Quaternium-7 is a gentle conditioning silicone that smooths hair and skin without heavy buildup, making it a popular choice for detangling and frizz control.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Silicone Quaternium-9

Silicone Quaternium-9

4.0

Silicone Quaternium-9 is a gentle, water-soluble conditioning ingredient that smooths hair and reduces static without heavy buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
Read ingredient review

Conditioning Agent

Siloxanetriol Phytate

SILOXANETRIOL PHYTATE

3.8

A gentle silicone derivative that helps skin feel smooth while offering antioxidant protection, but research is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin conditioning agent

Sodium 5-Nitroguaiacolate

Sodium 5-Nitroguaiacolate

2.5

A synthetic skin-conditioning ingredient with limited research and potential for irritation; best avoided by sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareconditioning agent
Read ingredient review

Skin conditioning agent

Sodium Palmitoyl Chondroitin Sulfate

Sodium Palmitoyl Chondroitin Sulfate

3.8

A gentle, semi-synthetic ingredient that helps hydrate and plump the skin by mimicking natural skin components.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin Conditioning Agent

Sodium Palmitoyl Hydrolyzed Collagen

Sodium Palmitoyl Hydrolyzed Collagen

4.0

A gentle, semi-synthetic collagen derivative that helps skin feel smoother and more hydrated without the irritation of pure collagen.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin conditioning agent

Sodium Stearoyl Chondroitin Sulfate

Sodium Stearoyl Chondroitin Sulfate

3.8

A gentle skin conditioner that may help support moisture retention and skin barrier function, though research is limited.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin conditioning

Sodium Stearoyl DNA

Sodium Stearoyl DNA

3.8

Sodium Stearoyl DNA is a novel skin conditioner that may help support skin barrier function, but research is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin conditioning agent

Sodium Zinc Taurine Dithiooctanamide

Sodium Zinc Taurine Dithiooctanamide

3.8

A gentle, multi-tasking ingredient that may help calm skin and support barrier repair, but research is still early.

Irritation

low

Source

synthetic

beautyskincareconditioning agent
Read ingredient review