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

Film Former

Bis-Methoxy PEG-10 Poly(TMXDI)

BIS-METHOXY PEG-10 POLY(TETRAMETHYLXYLENE DIISOCYANATE)

3.8

A synthetic film-former that helps makeup last longer and resist water, but may feel tight or dry on sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Solvent

Bis-Methoxyethoxy Methane

Bis-Methoxyethoxy Methane

3.5

A synthetic solvent that helps other ingredients dissolve and improves product feel, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincaresolvent
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Hair Conditioning Agent

Bis-Oleamido Isopropyl Alcohol

BIS-OLEAMIDO ISOPROPYL ALCOHOL

3.8

A gentle synthetic conditioner that helps soften hair and skin without heavy buildup, but offers limited additional benefits.

Irritation

low

Source

synthetic

beautyskincarehaircare
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UV absorber

Bis-PABA Porphyra 334

Bis-PABA Porphyra 334

3.5

A lab-enhanced version of a natural algae sunscreen compound that shows promise for UV protection, but human research is still limited.

Irritation

low

Source

semi-synthetic

beautyskincaresunscreen
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Emulsifier

Bis-Palmitoyl Tromethamine

Bis-Palmitoyl Tromethamine

4.0

A gentle emulsifier that helps blend oil and water, improving product texture and stability without common irritation concerns.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Humectant

Bis-PCA Dimethicone

BIS-PCA DIMETHICONE

4.0

A gentle silicone that hydrates and smooths skin without a heavy or greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincaresilicone
Read ingredient review

Emulsifier

Bis-PEG-1 Dimethicone

BIS-PEG-1 DIMETHICONE

4.0

A gentle silicone emulsifier that helps create smooth, stable formulas without heavy or greasy feel.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG-10 Dimethicone

BIS-PEG-10 DIMETHICONE

4.0

A gentle silicone emulsifier that improves product texture and spreadability without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG-12 Dimethicone

BIS-PEG-12 DIMETHICONE

4.0

A gentle silicone emulsifier that improves product texture and feel without common silicone downsides.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG-18 Disiloxane

BIS-PEG-18 DISILOXANE

4.0

A gentle silicone emulsifier that helps create smooth, lightweight textures without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG-20 Dimethicone

BIS-PEG-20 DIMETHICONE

4.0

A gentle silicone emulsifier that improves product texture and helps ingredients mix together without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG-4 Dimethicone

BIS-PEG-4 DIMETHICONE

4.3

A gentle silicone emulsifier that improves product texture and spreadability without common silicone downsides.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG-8 Dimethicone

BIS-PEG-8 DIMETHICONE

4.0

A gentle silicone emulsifier that improves product texture and spreadability without clogging pores or causing irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG-8 PEG-8 Dimethicone

BIS-PEG-8 PEG-8 DIMETHICONE

4.2

A gentle silicone emulsifier that helps products feel silky and spread easily without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG/PPG-15/5 Dimethicone

BIS-PEG/PPG-15/5 DIMETHICONE

4.0

A gentle silicone emulsifier that helps products spread smoothly and feel silky without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG/PPG-16/16 Dimethicone

BIS-PEG/PPG-16/16 PEG/PPG-16/16 DIMETHICONE

4.0

A gentle silicone emulsifier that creates smooth, spreadable textures without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

Bis-PEG/PPG-20/5 Dimethicone

BIS-PEG/PPG-20/5 PEG/PPG-20/5 DIMETHICONE

4.0

A gentle silicone emulsifier that improves texture and spreadability without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Film Former

Bis-PEG/PPG/IPDI Copolymer

BIS-PEG-2/PPG-3/IPDI COPOLYMER

3.8

A synthetic polymer that helps makeup and sunscreen stay put longer, especially in water or sweat.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Skin conditioning agent

Bis-Phenylpropyl Dimethicone

BIS-PHENYLPROPYL DIMETHICONE

4.0

A gentle silicone that gives products a silky feel and helps them glide on smoothly without clogging pores.

Irritation

low

Source

synthetic

beautyskincaresilicone
Read ingredient review

Anti-Aging Agent

Bis-Retinamido Methylpentane

Bis-Retinamido Methylpentane

4.0

A gentle, next-generation retinoid alternative that targets fine lines and uneven texture with less irritation than retinol.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Anti-aging

Bis-SH-Pentapeptide-38 Porphyra 334

BIS-SH-PENTAPEPTIDE-38 PORPHYRA 334

3.8

A novel peptide-marine extract hybrid that may help protect skin from UV-related damage, but human studies are limited.

Irritation

low

Source

semi-synthetic

beautyskincarepeptideantioxidant
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Anti-aging

Bis-SH-Pentapeptide-5 Porphyra 334

Bis-SH-Pentapeptide-5 Porphyra 334

4.0

A novel peptide-algae hybrid that may help protect skin from UV damage and support collagen, but clinical evidence is still limited.

Irritation

low

Source

semi-synthetic

beautyskincarepeptideantioxidant
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Emollient

Bis-Stearyl Dimethicone

Bis-Stearyl Dimethicone

4.0

A gentle silicone that gives a silky, smooth feel to products without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincaresilicone
Read ingredient review

Film Former

Bis-TMP Dimethicone

BIS-TMP DIMETHICONE

4.0

A gentle silicone that helps products glide on smoothly and leaves a silky, non-greasy finish.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Photoinitiator

Bis-Trimethylbenzoyl Phenylphosphine Oxide

Bis-Trimethylbenzoyl Phenylphosphine Oxide

3.5

A synthetic photoinitiator that makes UV-cured nail products harden quickly, but may cause skin irritation or allergic reactions in some people.

Irritation

moderate

Source

synthetic

beautyskincarenail care
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