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 20,303
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

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
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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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Film Former

Bis-Vinyl Diphenyl Dimethicone

BIS-VINYL DIPHENYL DIMETHICONE

4.0

A gentle silicone that creates a silky, smooth finish on skin and hair without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Bis-Vinyldimethicone

BIS-VINYLDIMETHICONE

4.0

Bis-Vinyldimethicone is a silicone polymer that creates a smooth, breathable film on skin and hair, improving product feel and wear without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
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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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Soothing Agent

Bisabolol

Bisabolol

4.5

Bisabolol is a gentle, plant-derived ingredient that helps calm redness and irritation, making it a great choice for sensitive or reactive skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Emollient

Bisdilinoleate

Bisdilinoleate

4.0

A gentle, non-greasy emollient that helps soften and smooth the skin without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Antioxidant

Bishop's Weed Flower Extract

Trachyspermum ammi flower extract

3.8

A gentle botanical extract with antioxidant potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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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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Opacifying Agent

Bismuth Citrate

BISMUTH CITRATE

3.5

Bismuth Citrate is a safe synthetic colorant that adds opacity and a subtle shimmer to makeup, but it offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Bismuth Subgallate

Bismuth Subgallate

3.5

Bismuth Subgallate is a synthetic colorant and mild skin protectant, generally safe in low concentrations but with limited cosmetic research.

Irritation

low

Source

synthetic

beautyskincarecolorant
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Opacifying Agent

Bismuth Subnitrate

Bismuth Subnitrate

3.0

Bismuth subnitrate gives a silky feel and opacity to powders, but can cause skin irritation in some people, especially those with sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecolorant
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Skin conditioner

Bisphenylhexamethicone

Bisphenylhexamethicone

4.0

A lightweight silicone that improves product texture and leaves a smooth finish without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehaircare
Read ingredient review

Film Former

Bispolyethylene Dimethicone

Bispolyethylene Dimethicone

3.8

A silicone polymer that helps products spread smoothly and resist water, but may not suit those avoiding silicones.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Soothing agent

Bistort Root Extract

Polygonum Bistorta Root Extract

3.8

Bistort root extract is a gentle botanical with antioxidant and soothing potential, but human studies are limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Emollient

Bitter Almond Kernel Oil

Prunus Amygdalus Amara Kernel Oil

4.0

A rich, nourishing oil that softens skin but may clog pores for some — best for dry or normal skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Bitter Almond Oil

Prunus Amygdalus Amara (Bitter Almond) Kernel Oil

3.8

A rich emollient oil that softens skin but may be moderately comedogenic for acne-prone types.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Bitter Almond Seed Extract

PRUNUS AMYGDALUS AMARA SEED EXTRACT

3.8

A plant extract that may help calm skin and fight free radicals, but it requires careful processing to remove potentially irritating compounds.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Astringent

Bitter Apple Powder

Citrullus Colocynthis Powder

3.5

Bitter Apple Powder may help calm skin and reduce excess oil, but it can be irritating for sensitive skin and lacks strong research support.

Irritation

moderate

Source

natural

beautyskincareastringent
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Antioxidant

Bitter Melon Leaf Powder

Momordica Charantia Leaf Powder

3.8

A gentle plant-based antioxidant that may help calm skin, but research is still early and benefits are not yet proven in human studies.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Soothing agent

Bitter Melon Stem Sap

MOMORDICA CHARANTIA STEM SAP

3.8

A gentle, plant-based sap that may help calm skin and provide antioxidant support, though research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Fragrance

Bitter Orange Flower Oil

CITRUS AURANTIUM AMARA FLOWER OIL

4.0

A fragrant essential oil with mild skin-soothing potential, best used at low concentrations and avoided by those with sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Bitter Orange Flower Water

CITRUS AURANTIUM AMARA FLOWER WATER

4.0

A gentle, aromatic floral water that can refresh and soothe the skin, but its benefits are largely due to its mild hydrating and calming properties rather than potent active compounds.

Irritation

low

Source

natural

beautyskincaretonerfragrance
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Emollient

Bitter Orange Flower Wax

Citrus Aurantium Amara Flower Wax

4.0

A gentle, natural wax that softens skin and adds a subtle floral scent, but its benefits are mainly textural and aromatic rather than active.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Bitter Orange Fruit Extract

CITRUS AURANTIUM AMARA FRUIT EXTRACT

3.8

A natural antioxidant extract that may help brighten skin and tighten pores, but can be irritating for sensitive skin due to its citrus content.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Antioxidant

Bitter Orange Fruit Juice Extract

CITRUS AURANTIUM AMARA (BITTER ORANGE) FRUIT JUICE EXTRACT

3.8

A natural antioxidant and astringent from bitter orange juice, but may cause irritation in sensitive skin due to natural fruit acids.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Fragrance

Bitter Orange Leaf Oil

CITRUS AURANTIUM LEAF OIL

3.8

A fragrant essential oil that can add a fresh scent and mild tightening feel, but may irritate sensitive skin due to its aromatic compounds.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Bitter Orange Leaf/Twig Extract

CITRUS AURANTIUM AMARA LEAF/TWIG EXTRACT

3.5

A gentle antioxidant extract from bitter orange leaves and twigs, but limited research and potential for skin irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Fragrance

Bitter Orange Leaf/Twig Oil

CITRUS AURANTIUM AMARA LEAF/TWIG OIL

3.8

A fragrant essential oil with mild astringent properties, best suited for those who enjoy botanical scents and have non-sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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