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

Antistatic Agent

Soy & Rapeseed Oil Conditioning Agent

Bis-Soyoyl/Rapeseedoyl Ethyl Hydroxyethylmonium Methosulfate

4.0

A gentle, plant-based conditioning ingredient that helps detangle and soften hair with minimal irritation risk.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Humectant

Soy Ferment

SACCHAROMYCES/SOY PROTEIN FERMENT

4.0

A gentle, fermented ingredient that helps hydrate and support the skin barrier without irritation.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Antistatic Agent

Soy Hydroxyethyl Imidazoline

SOY HYDROXYETHYL IMIDAZOLINE

3.8

A gentle, plant-derived conditioning agent that helps soften hair and reduce frizz without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
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Skin conditioning agent

Soy Phytoplacenta Extract

Glycine Soja (Soybean) Phytoplacenta Extract

3.5

A botanical extract from soybeans that may offer antioxidant and skin-conditioning benefits, but human evidence is limited.

Irritation

low

Source

natural

beautyskincareconditioning agent
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Antistatic Agent

Soyalkonium Chloride

SOYALKONIUM CHLORIDE

3.8

A gentle, plant-derived conditioning ingredient that reduces static and softens hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Conditioning Agent

Soyamidopropyl Dimethylamine

Soyamidopropyl Dimethylamine

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Conditioning Agent

Soyamidopropyl Ethyldimonium Ethosulfate

SOYAMIDOPROPYL ETHYLDIMONIUM ETHOSULFATE

4.0

A gentle, soy-derived conditioning ingredient that reduces static and improves softness without heavy buildup, suitable for most hair types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Conditioning Agent

Soyamidopropyl Wheat Protein

SOYAMIDOETHYLDIMONIUM/TRIMONIUM HYDROXYPROPYL HYDROLYZED WHEAT PROTEIN

4.0

A gentle conditioning ingredient derived from wheat protein that helps reduce static and improve softness in hair and skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Soyethyldimonium Ethosulfate

SOYETHYLDIMONIUM ETHOSULFATE

4.0

A gentle, plant-derived conditioning ingredient that helps reduce static and soften hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Skin conditioning

Spirulina Ferment Filtrate

ARTHROSPIRA PLATENSIS CULTURE CONDITIONED MEDIA

4.0

A gentle, antioxidant-rich ferment that supports skin barrier function and soothes irritation without clogging pores.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Antistatic Agent

Stearamidoethyl Diethanolamine HCl

STEARAMIDOETHYL DIETHANOLAMINE HCL

3.5

A synthetic conditioning agent that reduces static and softens hair, but may not suit those avoiding ethoxylated ingredients.

Irritation

low

Source

synthetic

beautyskincarehair careconditioning agent
Read ingredient review

Antistatic Agent

Stearamidopropyl Cetearyl Dimonium Tosylate

STEARAMIDOPROPYL CETEARYL DIMONIUM TOSYLATE

3.8

A synthetic conditioning ingredient that helps reduce frizz and static while adding softness to hair and skin, but may feel heavy for very fine hair.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Hair Conditioner

Stearamidopropyl Dimethicone

STEARAMIDOPROPYL DIMETHICONE

4.0

A gentle silicone that smooths hair and softens skin without heavy buildup, but may not suit those avoiding all silicones.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Conditioning Agent

Stearamidopropyl Dimethylamine

Stearamidopropyl Dimethylamine

4.0

A gentle conditioning ingredient that helps detangle hair and soften skin without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Stearamidopropyl Morpholine Lactate

STEARAMIDOPROPYL MORPHOLINE LACTATE

3.5

A synthetic conditioning agent that helps reduce static and soften hair, generally well-tolerated but with limited research on long-term effects.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Hair Conditioning Agent

Steardimonium Hydroxypropyl Hydrolyzed Casein

Steardimonium Hydroxypropyl Hydrolyzed Casein

3.8

A gentle conditioning ingredient derived from milk protein that helps hair feel smoother and less frizzy without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Conditioning Agent

Stearoxypropyl Dimethylamine

Stearoxypropyl Dimethylamine

3.8

A synthetic conditioning agent that softens hair and skin but may cause irritation or clog pores in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarehaircareconditioning agent
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Conditioning Agent

Stearyl PG-Dimethylamine

STEARYL PG-DIMETHYLAMINE

4.0

A gentle conditioning ingredient that helps detangle and soften hair without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Skin conditioning agent

Sturgeon Coelomic Fluid Filtrate

Sturgeon Coelomic Fluid Filtrate

3.8

A protein-rich ingredient from sturgeon fluid that may help hydrate and temporarily firm skin, but scientific evidence is limited and it comes with ethical and sustainability concerns.

Irritation

low

Source

natural

beautyskincareconditioning agent
Read ingredient review

Hair conditioning agent

Sulfurized Hydrolyzed Corn Protein

SULFURIZED HYDROLYZED CORN PROTEIN

3.8

A gentle, protein-based ingredient that strengthens hair and forms a protective film, but may not suit protein-sensitive hair types.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Conditioning Agent

Sunfloweramidopropyl Dimethylamine

SUNFLOWERSEEDAMIDOPROPYL DIMETHYLAMINE

4.0

A gentle, plant-derived conditioning ingredient that helps soften and detangle hair with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review

Conditioning Agent

Sunfloweramidopropyl Dimethylamine Lactate

SUNFLOWERSEEDAMIDOPROPYL DIMETHYLAMINE LACTATE

4.0

A gentle, plant-derived conditioning ingredient that softens hair and reduces static, ideal for those seeking a lighter alternative to silicones.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review

Conditioning Agent

Sunfloweramidopropyl Ethyldimonium Ethosulfate

SUNFLOWERSEEDAMIDOPROPYL ETHYLDIMONIUM ETHOSULFATE

4.0

A mild, sunflower-derived conditioning ingredient that smooths hair and reduces static, suitable for most hair types including sensitive scalps.

Irritation

low

Source

semi-synthetic

beautyhaircareconditioning agent
Read ingredient review

Surfactant

Tallow Amidopropyl Dimethylamine

TALLAMIDOPROPYL DIMETHYLAMINE

3.5

A fatty amine conditioner from animal fat that softens hair and skin but may be too heavy for oily or acne-prone types.

Irritation

moderate

Source

natural

beautyskincarehaircareconditioning agent
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Antistatic Agent

Tallow Trihydroxyethylammonium Acetate

Tallow Trihydroxyethylammonium Acetate

3.5

A gentle conditioning ingredient from animal fat that softens hair and reduces static, but may be too heavy for oily or acne-prone skin.

Irritation

low

Source

natural

beautyskincarehaircareconditioning agent
Read ingredient review

Antistatic Agent

Tallowdimonium Propyltrimonium Dichloride

TALLOWDIMONIUM PROPYLTRIMONIUM DICHLORIDE

3.5

A conditioning ingredient derived from animal fat that reduces static and softens hair, but may be too heavy for fine or oily hair types.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Film Former

TEA-Abietoyl Hydrolyzed Collagen

TEA-Abietoyl Hydrolyzed Collagen

3.8

A semi-synthetic collagen derivative that forms a light film on skin to help smooth texture and temporarily reduce the look of fine lines, but research on its long-term benefits is limited.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
Read ingredient review

Surfactant

TEA-Myristoyl Hydrolyzed Collagen

TEA-Myristoyl Hydrolyzed Collagen

3.8

A gentle cleansing and conditioning ingredient derived from collagen, best for rinse-off products like shampoos and body washes.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
Read ingredient review

Skin conditioning agent

TEA-Undecylenoyl Hydrolyzed Collagen

TEA-Undecylenoyl Hydrolyzed Collagen

3.8

A gentle, semi-synthetic ingredient that helps condition skin and may offer mild antimicrobial support, but its collagen benefits are limited to surface-level hydration.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin conditioning agent

Thiamine Yeast Polypeptide

THIAMINE/YEAST POLYPEPTIDE

3.8

A gentle, biotech-derived blend of vitamin B1 and yeast peptides that may help soothe and condition the skin, though research is still emerging.

Irritation

low

Source

biotech

beautyskincareconditioning agent
Read ingredient review

Skin conditioning agent

Thymine

Thymine

3.5

Thymine is a DNA base with emerging research in skin repair, but its cosmetic benefits are not yet well-established in human studies.

Irritation

low

Source

natural

beautyskincareconditioning agent
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Antioxidant

Tocopherol Wheat Peptide Complex

Tocopherol/Wheat Polypeptides

4.0

A gentle antioxidant blend that pairs vitamin E with wheat proteins to support skin barrier function and provide light hydration.

Irritation

low

Source

mixed

beautyskincareantioxidantconditioning agent
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