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

Antioxidant

Pear Fruit Cell Extract

Pyrus Communis Fruit Cell Extract

4.0

A gentle, plant-derived antioxidant that helps protect skin from environmental stress and supports a healthy-looking complexion.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Humectant

Pear Fruit Extract

Pyrus Communis Fruit Extract

4.0

Pear Fruit Extract is a gentle, hydrating ingredient that helps soothe and moisturize the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Pear Fruit Juice

Pyrus Communis Fruit Juice

3.8

Pear fruit juice is a gentle, water-binding ingredient that adds light hydration and a touch of natural antioxidant activity to skincare formulas.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Pear Seed Extract

Pyrus Communis Seed Extract

4.0

Pear Seed Extract is a gentle, antioxidant-rich ingredient that helps protect skin from environmental stress while providing light hydration.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Pear Twig Extract

Pyrus Communis Twig Extract

3.8

A gentle, plant-based antioxidant that may help calm skin and defend against environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Pearl Powder

PEARL POWDER

3.8

Pearl powder offers gentle physical exfoliation and a subtle glow, but its brightening and skin-repair claims are not strongly supported by independent research.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing Agent

Peat Extract

PEAT

3.5

Peat extract is a natural, mineral-rich ingredient with limited research, but early studies suggest it may help soothe and condition the skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Pecan Seed Extract

Carya Illinoinensis Seed Extract

3.8

Pecan Seed Extract is a gentle, antioxidant-rich ingredient that may help protect skin from environmental stress, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Pecan Seed Oil

Carya Illinoinensis Seed Oil

4.0

A gentle, non-greasy oil rich in fatty acids and vitamin E that helps soften and protect the skin barrier.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Pecan Shell Extract

Carya Illinoensis Shell Extract

3.8

Pecan Shell Extract is a gentle, antioxidant-rich ingredient that may help protect skin from environmental stress, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Abrasive

Pecan Shell Powder

CARYA ILLINOINENSIS SHELL POWDER

3.8

A natural, biodegradable physical exfoliant, but the irregular particle shape can cause micro-tears if not finely milled.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review

Thickener

Pectin

Pectin

4.0

Pectin is a gentle, fruit-derived thickener and hydrator that helps stabilize formulas and adds a light, non-greasy feel to skincare products.

Irritation

low

Source

natural

beautyskincarethickenerhumectant
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Skin conditioning agent

Pectobacterium Polypeptide-1

SR-PECTOBACTERIUM POLYPEPTIDE-1

3.8

A novel biotech peptide that may help strengthen the skin barrier and reduce fine lines, but research is still early.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Antioxidant

Pectolinarin

Pectolinarin

3.8

Pectolinarin is a plant-derived flavonoid with antioxidant and soothing potential, but research in cosmetics is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Skin conditioning agent

Pediococcus Ferment Filtrate

Pediococcus Ferment Filtrate

4.0

A gentle, probiotic ingredient that helps support your skin's natural microbiome and improve barrier function.

Irritation

low

Source

biotech

beautyskincaremicrobiome
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Fragrance

Peel Oils

Citrus Aurantium Dulcis (Orange) Peel Oil, Citrus Limon (Lemon) Peel Oil, Citrus Paradisi (Grapefruit) Peel Oil

3.8

Peel oils add a fresh citrus scent and mild antioxidant activity, but they can be irritating for sensitive skin and are primarily used for fragrance.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Viscosity Controlling

PEG Crosspolymer

PEG Crosspolymer

3.8

A safe, synthetic thickener that improves product feel and stability without major skin concerns.

Irritation

low

Source

synthetic

beautyskincaretexturizer
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Film Former

PEG Crosspolymer Film Former

METHOXY PEG-17/METHOXY PEG-11/HDI CROSSPOLYMER

3.8

A synthetic film former that helps products stay put and resist water, but it offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Delivery Agent

PEG Dendrimer Complex

PEG-222 PENTAERYTHRITYL ADIPATE-SUCCINIMIDE DENDRIMER

3.8

A cutting-edge synthetic molecule that acts like a microscopic delivery truck, carrying active ingredients deeper into skin layers.

Irritation

low

Source

synthetic

beautyskincaredelivery agent
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Emollient

PEG Fluorinated Ester

Polyperfluoroethoxymethoxy Difluoroethyl PEG Diisostearate

3.5

A synthetic fluorinated ingredient that helps products feel silky and resist water, but its environmental persistence raises concerns.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

PEG Oleate

PEG Oleate

3.5

PEG Oleate is a common synthetic emulsifier that helps mix oil and water, but it may be slightly irritating for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Film Former

PEG Soyamine Polyurethane Copolymer

DI-PEG-2 SOYAMINE/POLYDIETHYLENEGLYCOL ADIPATE/IPDI COPOLYMER

3.5

A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Surfactant

PEG-10

PEG-10

3.5

PEG-10 is a common synthetic emulsifier that helps blend oil and water in cleansers, but may raise concerns about potential contamination with impurities depending on manufacturing quality.

Irritation

low

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Film Former

PEG-10 Acrylate Crosspolymer

PEG-10 Acrylate Dipentaerythrityl Pentaacrylate/HDI Crosspolymer

3.8

A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Emulsifier

PEG-10 Avocado Oil Glyceryl Esters

PEG-10 Avocado Oil Glyceryl Esters

4.0

A mild, avocado-derived emulsifier that helps create stable, creamy textures while adding a touch of skin-softening benefit.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Castor Oil

PEG-10 Castor Oil

3.8

PEG-10 Castor Oil is a reliable emulsifier that helps mix water and oil in your products, but its PEG component raises mild purity concerns for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Surfactant

PEG-10 Cocamine

PEG-10 Cocamine

3.5

PEG-10 Cocamine is an effective cleansing and emulsifying agent, but may be mildly irritating for sensitive skin due to its surfactant nature.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Antistatic Agent

PEG-10 Coco-Benzonium Chloride

PEG-10 Coco-Benzonium Chloride

3.5

A synthetic conditioning agent that reduces static and softens hair, but may cause irritation for sensitive scalps.

Irritation

moderate

Source

synthetic

beautyhair careconditioning agent
Read ingredient review

Film Former

PEG-10 Dimethicone Copolymer

BIS-METHOXY PEG-10 DIMETHYL MEA/HDI/BIS-PEG-10 DIMETHICONE COPOLYMER

3.8

A silicone copolymer that helps products feel silky, spread evenly, and resist water, but may not suit those avoiding silicones.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emulsifier

PEG-10 Dioleate

PEG-10 Dioleate

3.5

PEG-10 Dioleate helps mix oil and water in products, but may be slightly irritating or pore-clogging for sensitive or acne-prone skin.

Irritation

moderate

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Glyceryl Diisostearate

PEG-10 Glyceryl Diisostearate

3.8

A reliable synthetic emulsifier that helps create stable, creamy textures, but may not suit those avoiding PEGs.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PEG-10 Glyceryl Oleate

PEG-10 Glyceryl Oleate

3.8

A gentle emulsifier that helps mix oil and water in cleansers and creams, generally well-tolerated by most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Glyceryl Stearate

PEG-10 Glyceryl Stearate

4.0

A reliable emulsifier that helps create smooth, stable creams and lotions with low irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Glyceryl Trioleate

PEG-10 Glyceryl Trioleate

3.5

A workhorse emulsifier that helps oil and water mix, but may not suit everyone due to its synthetic origin and potential for mild irritation in sensitive skin.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Glyceryl Tristearate

PEG-10 Glyceryl Tristearate

3.8

A gentle synthetic emulsifier that helps water and oil mix in your creams and lotions, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Hydrogenated Castor Oil

PEG-10 Hydrogenated Castor Oil

4.0

A gentle, plant-based emulsifier that helps mix oil and water, but may feel slightly heavy on very oily skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

PEG-10 Hydrogenated Lanolin

PEG-10 Hydrogenated Lanolin

3.8

A gentle, lanolin-based emollient that helps soften skin and stabilize formulas, but may clog pores for some.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
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Emulsifier

PEG-10 Hydrogenated Tallow Amine

PEG-10 Hydrogenated Tallow Amine

3.5

A synthetic emulsifier that helps blend oil and water in products, but may be irritating for sensitive skin and has moderate comedogenic potential.

Irritation

moderate

Source

synthetic

beautyskincarehaircare
Read ingredient review

Surfactant

PEG-10 Isolaureth-6

PEG-10 ISOLAURYL THIOETHER

3.5

A synthetic cleansing agent that helps remove dirt and oil, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-10 Isostearate

PEG-10 Isostearate

3.5

A reliable synthetic emulsifier that helps mix oil and water, but may be less eco-friendly than some alternatives.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Lanolate

PEG-10 Lanolate

3.8

A gentle emulsifier derived from lanolin that helps blend oil and water, but may be mildly comedogenic for acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

PEG-10 Lanolin

PEG-10 Lanolin

3.8

A gentle, water-soluble lanolin derivative that softens skin and helps blend oil and water in formulas, but may clog pores for some.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
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Emulsifier

PEG-10 Laurate

PEG-10 Laurate

3.5

A common synthetic emulsifier that helps mix oil and water, but may be slightly irritating for very sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

PEG-10 Oleamine

PEG-10 Oleamine

3.5

PEG-10 Oleamine is an effective emulsifier but may cause irritation or clog pores for sensitive or acne-prone skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Emulsifier

PEG-10 Olive Glycerides

PEG-10 OLIVE GLYCERIDES

4.0

A mild, olive-derived emulsifier that helps create stable, creamy textures without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-10 Phytosterol

PEG-10 Phytosterol

4.0

A mild, plant-based emulsifier that helps create stable, creamy textures while also offering light skin conditioning.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

PEG-10 Rapeseed Sterol

PEG-10 RAPESEED STEROL

4.0

A mild, plant-derived emulsifier that helps blend oil and water in skincare formulas while adding a smooth, non-greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emulsifier

PEG-10 Silicone Crosspolymer Blend

PEG-10 POLYDIMETHYLSILOXYETHYL DIMETHICONE/BIS-VINYL DIMETHICONE CROSSPOLYMER

4.0

A reliable silicone emulsifier that helps blend water and oil phases for a smooth, non-greasy finish.

Irritation

low

Source

synthetic

beautyskincareemulsifier
Read ingredient review