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 59 of 59
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

Stabilizer

Aluminum Isopropoxide

ALUMINUM ISOPROPOXIDE

2.5

Aluminum isopropoxide is a synthetic stabilizer rarely used in leave-on skincare; it may pose irritation risks and is best avoided in sensitive skin products.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Emollient

Aluminum Lanolate

ALUMINUM LANOLATE

3.5

Aluminum Lanolate is a waxy stabilizer that helps keep water and oil mixed, but it may not suit acne-prone skin due to its moderate comedogenic potential.

Irritation

low

Source

semi-synthetic

beautyskincareemollientstabilizer
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Buffering Agent

Aluminum Triphosphate

ALUMINUM TRIPHOSPHATE

3.5

Aluminum Triphosphate is a safe, low-irritation stabilizer that helps maintain product pH and texture, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

Aminotrimethylene Phosphonic Acid

Aminotrimethylene Phosphonic Acid

3.5

A behind-the-scenes stabilizer that protects your products from metal contamination, but not a direct skin benefit ingredient.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

Beta-Alanine Diacetic Acid

Beta-Alanine Diacetic Acid

4.0

A gentle synthetic chelator that helps your skincare products stay effective longer by preventing metal ions from breaking down ingredients.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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UV Absorber

Bis(T-Butyl Benzoxazolyl) Thiophene

BIS(T-BUTYL BENZOXAZOLYL) THIOPHENE

3.8

A synthetic UV stabilizer that helps protect both your skin and the product formula from UV damage, but it's not a primary sunscreen active.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Stabilizer

Bismaleate

Bismaleate

3.5

Bismaleate is a synthetic stabilizer that helps keep skincare products consistent and pleasant to use, but it has limited direct skin benefits.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Thickener

Calcium Potassium Carbomer

Calcium Potassium Carbomer

4.0

A gentle, synthetic thickener that helps create smooth gel textures and keeps formulas stable without irritating skin.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Buffering Agent

Calcium Trifluoroacetate

CALCIUM TRIFLUOROACETATE

2.0

Calcium Trifluoroacetate is a synthetic salt used in tiny amounts for pH control, but it is rare in mainstream skincare and lacks robust safety data for cosmetic use.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Emollient

Cetearyl Stearate

Cetearyl Stearate

4.0

Cetearyl Stearate is a gentle, waxy ingredient that helps creams feel rich and smooth without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollientstabilizer
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Stabilizer

Cucurbiturils

Cucurbiturils

3.5

Cucurbiturils are advanced synthetic molecules that help stabilize and deliver active ingredients, but their use in cosmetics is still emerging and not widely studied in everyday products.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Stabilizer

Cyclodextrin

Cyclodextrin

4.0

Cyclodextrin is a gentle, sugar-based molecule that helps stabilize and deliver active ingredients deeper into the skin without irritation.

Irritation

low

Source

natural

beautyskincarestabilizer
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Stabilizer

Cyclodextrin Crosspolymer

Cyclodextrin Crosspolymer

4.0

A gentle, starch-derived powder that helps stabilize and slowly release active ingredients, making formulas more effective and less irritating.

Irritation

low

Source

semi-synthetic

beautyskincarestabilizer
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Chelating Agent

Diammonium Ferric Pentetate

DIAMMONIUM FERRIC PENTETATE

3.5

A behind-the-scenes stabilizer that helps keep your products fresh and effective by neutralizing trace metals.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Stabilizer

Diethyllutidinate

Diethyllutidinate

3.5

Diethyllutidinate is a synthetic stabilizer that may help other ingredients work better, but research on its direct skin benefits is still limited.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Stabilizer

Dimethyl Octynediol

Dimethyl Octynediol

3.5

A synthetic stabilizer that helps keep formulas consistent but may cause irritation in sensitive skin at higher levels.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Chelating Agent

Disodium EDTA

Disodium EDTA

4.0

Disodium EDTA is a safe, widely used stabilizer that protects your skincare products from metal contamination, helping them stay effective longer.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Reducing agent

Dithiothreitol

Dithiothreitol

2.0

Dithiothreitol is a lab-made reducing agent occasionally used in skincare to break disulfide bonds, but it's not a common or well-studied ingredient for cosmetic benefits and may cause irritation at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Antioxidant

Ditridecyl Thiodipropionate

DITRIDECYL THIODIPROPIONATE

3.8

A synthetic antioxidant that helps keep oils and butters fresh, but it's not a star active for skin benefits.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

EDTA

EDTA

4.0

EDTA is a workhorse stabilizer that protects your skincare formulas from metal contamination, helping them stay effective longer.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Stabilizer

Ethyl-3-Alpha

Ethyl-3-Alpha

3.0

Ethyl-3-Alpha is a synthetic ingredient with limited public data; it appears safe at low levels but lacks robust research.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Buffering Agent

Magnesium Phosphate

MAGNESIUM PHOSPHATE

3.5

Magnesium phosphate is a safe, low-irritation mineral salt that helps keep your skincare products stable and at the right pH, but it doesn't directly improve your skin.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Stabilizer

Peracid-Aluminum Complex

ETHANEPEROXOIC ACID/ALUMINUM ISOPROXIDE/TRIMETHYL-CYCLODODECATRIENE

2.5

This is a synthetic processing aid with limited direct skin benefit; it's rarely used in leave-on skincare and may pose irritation risks at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
Read ingredient review

UV Absorber

Phenyldimethoxyacetophenone

Phenyldimethoxyacetophenone

3.8

A synthetic stabilizer that protects your skincare products from breaking down in light, but it's not a primary sunscreen agent.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Buffering Agent

Phosphate Buffered Saline

Water, Sodium Chloride, Disodium Phosphate, Potassium Phosphate, Potassium Chloride

3.5

A gentle pH buffer and saline base that helps keep other ingredients stable and comfortable on skin.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Buffering Agent

Potassium Metaphosphate

POTASSIUM METAPHOSPHATE

4.0

A gentle pH adjuster and stabilizer that helps keep your skincare formulas balanced and effective without causing irritation.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Viscosity Controlling

Potassium Oxidized Microcrystalline Wax

POTASSIUM OXIDIZED MICROCRYSTALLINE CERA

3.5

A modified wax that helps thicken and stabilize products, generally considered safe and non-irritating for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincarestabilizer
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Buffering Agent

Potassium Polyphosphate

Potassium Polyphosphate

3.5

A synthetic mineral salt that helps keep your skincare products stable and at the right pH, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Reducing Agent

Sodium Borohydride

SODIUM BOROHYDRIDE

2.0

Sodium borohydride is a synthetic chemical used in tiny amounts as a processing aid in cosmetics, not a direct skincare ingredient, and its safety depends on proper formulation.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Reducing Agent

Sodium Hydrosulfite

SODIUM HYDROSULFITE

2.0

Sodium hydrosulfite is a strong reducing agent used mainly in industrial or hair color removal products, not a common or recommended ingredient for everyday skincare.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Reducing Agent

Sodium Oxymethylene Sulfoxylate

Sodium Oxymethylene Sulfoxylate

3.5

A synthetic stabilizer that prevents oxidation but may release trace formaldehyde under certain conditions, making it a cautious choice for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

Sodium Pentamethylene Phosphonate

SODIUM DIETHYLENETRIAMINE PENTAMETHYLENE PHOSPHONATE

3.8

A behind-the-scenes stabilizer that protects your products from metal contamination, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Stabilizer

Sodium Stannate

Sodium Stannate

2.5

Sodium stannate is a synthetic stabilizer used mainly in hair dyes; it's effective but has moderate irritation potential and limited research on long-term safety.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

Sodium Trimetaphosphate

SODIUM TRIMETAPHOSPHATE

3.8

A gentle chelating agent that helps maintain product stability and effectiveness by binding metal ions.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Stabilizer

Sodium Tungstate Antimonate

SODIUM TUNGSTATE ANTIMONATE

2.0

Sodium Tungstate Antimonate is a synthetic stabilizer with limited cosmetic research and potential safety concerns; it's best avoided in leave-on products until more data is available.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Stabilizer

Stannous Chloride

STANNOUS CHLORIDE

2.5

Stannous chloride is a synthetic stabilizer used in some hair dyes and formulas to prevent oxidation, but it has moderate irritation potential and is not common in everyday skincare.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Stabilizer

Stannous Pyrophosphate

Stannous Pyrophosphate

3.5

Stannous pyrophosphate is a synthetic stabilizer that helps preserve product integrity, but its role is more about formulation stability than direct skin benefits.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Chelating Agent

Tetrahydroxyethyl Ethylenediamine

TETRAHYDROXYETHYL ETHYLENEDIAMINE

4.0

A gentle chelating agent that helps your skincare products stay effective and stable by neutralizing hard water minerals.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

Tetrapotassium Etidronate

Tetrapotassium Etidronate

4.0

A behind-the-scenes helper that protects your skincare formulas from metal contamination, keeping them effective and stable.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

Triethylenetetramine HCl

TRIETHYLENETETRAMINE HCL

3.5

A synthetic chelator that helps preserve formula integrity by neutralizing trace metals, but it is rarely highlighted as a standalone active.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Buffering Agent

Trimethylamine Oxide

TRIMETHYLAMINE OXIDE

3.5

Trimethylamine Oxide is a gentle buffering agent that helps maintain product stability, but its role in skincare is minor and not a primary active ingredient.

Irritation

low

Source

natural

beautyskincarestabilizer
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Stabilizer

Trimethylolpropane

Trimethylolpropane

3.0

Trimethylolpropane is a synthetic alcohol used as a building block for other ingredients; it is not a direct active and is generally safe at low concentrations.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Stabilizer

Tris Isocyanuric Acid

Tris Isocyanuric Acid

3.5

A synthetic stabilizer that helps keep formulas consistent, but is rarely the star ingredient.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Chelating Agent

Trisodium EDTA

Trisodium EDTA

4.0

A safe and effective stabilizer that helps your products stay fresh and work better by neutralizing unwanted metals.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review

Chelating Agent

Trisodium Ethylenediamine Disuccinate

TRISODIUM ETHYLENEDIAMINE DISUCCINATE

4.5

A gentle, biodegradable alternative to traditional chelating agents that protects your skincare formulas from metal-induced degradation.

Irritation

low

Source

synthetic

beautyskincarestabilizer
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Chelating Agent

Trisodium HEDTA

Trisodium HEDTA

3.8

A gentle chelating agent that protects your skincare formulas from metal contamination, helping them stay effective longer.

Irritation

low

Source

synthetic

beautyskincarestabilizer
Read ingredient review