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

Emulsifier

PPG-70 Polyglyceryl-10 Ether

PPG-70 Polyglyceryl-10 Ether

4.0

A gentle, plant-derived emulsifier that helps blend water and oil in skincare formulas while leaving skin feeling soft.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Antioxidant

PPG-70 Tocophereth-100

PPG-70 Tocophereth-100

4.0

A gentle, water-soluble form of vitamin E that helps protect skin from environmental damage without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Humectant

PPG-75-PEG-300 Hexylene Glycol

PPG-75-PEG-300 Hexylene Glycol

3.8

A synthetic humectant that helps keep skin hydrated and improves product texture, but offers no unique benefits over more common alternatives.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emulsifier

PPG-8 Ceteth-20

PPG-8-CETETH-20

3.8

A reliable synthetic emulsifier that helps keep your products stable and creamy, but offers no direct skin benefit on its own.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Humectant

PPG-8 Glyceryl Ether

PPG-8 Glyceryl Ether

4.0

A gentle, synthetic humectant that attracts moisture to the skin without the sticky feel of glycerin.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emollient

PPG-8 Polyglyceryl-2 Ether

PPG-8 Polyglyceryl-2 Ether

4.0

A mild, water-soluble emollient that softens skin and improves product feel without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emollient

PPG-8 Sorbitol Castor Oil

PPG-8 SORBITOL CASTOR OIL

4.0

A gentle, semi-synthetic ingredient that helps products feel smooth and spread easily without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

PPG-8-Ceteth-1

PPG-8-CETETH-1

3.8

A safe, effective emulsifier that helps your skincare products feel smooth and stay stable, but it offers no direct skin benefit on its own.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PPG-8-Ceteth-10

PPG-8-CETETH-10

3.8

A reliable synthetic emulsifier that helps keep your product smooth and stable, but offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PPG-8-Ceteth-2

PPG-8-CETETH-2

4.0

A workhorse emulsifier that helps oil and water mix in your skincare, generally well-tolerated but purely synthetic.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PPG-8-Ceteth-5

PPG-8-Ceteth-5

3.8

A reliable synthetic emulsifier that helps mix oil and water in your products, but it's not a star ingredient with direct skin benefits.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Surfactant

PPG-8-Deceth-6

PPG-8-Deceth-6

3.8

A mild synthetic surfactant that helps products foam and rinse cleanly, generally well-tolerated but not a star active ingredient.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Antistatic Agent

PPG-9 Diethylmonium Chloride

PPG-9 Diethylmonium Chloride

3.8

A synthetic conditioning ingredient that helps reduce static and soften hair, but may cause buildup with frequent use.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Emollient

PPG-9 Diglyceryl Ether

PPG-9 Diglyceryl Ether

4.0

A gentle synthetic emollient that softens skin and improves product texture without common irritation or clogging concerns.

Irritation

low

Source

synthetic

beautyskincareemollient
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Surfactant

PPG-9 Ethylhexeth-5

PPG-9 Ethylhexeth-5

3.8

A gentle synthetic emulsifier that helps cleanse without stripping the skin, but offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincaresurfactant
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Humectant

PPG-9 Glyceryl Ether

PPG-9 Glyceryl Ether

4.0

A gentle, synthetic humectant that attracts moisture to the skin without common irritation or clogging.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emollient

PPG-9 Laurate

PPG-9 Laurate

3.8

A synthetic emollient that helps products feel silky and spread easily, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emulsifier

PPG-9 Steareth-3

PPG-9 Steareth-3

3.8

A synthetic emulsifier that helps mix water and oil in products, generally considered safe and low-irritation for most skin types.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Surfactant

PPG-9-Buteth-12

PPG-9-BUTETH-12

3.5

A synthetic emulsifier that helps products spread and rinse cleanly, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
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Emollient

PPG-90 Butyl Ether

PPG-90 Butyl Ether

4.0

A lightweight synthetic emollient that improves product feel and spreadability without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollienttexturizer
Read ingredient review

Viscosity Controlling

PPG/PEG Polymer Blend

PPG-23-PEG-4 TRIMETHYLOLPROPANE

3.5

A synthetic thickener that helps create a smooth, stable texture in creams and lotions, but offers no active skin benefits.

Irritation

low

Source

synthetic

beautyskincarethickener
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Emulsifier

PPG/PEG Trimethylolpropane

PPG-25-PEG-25 Trimethylolpropane

4.0

A gentle synthetic ingredient that helps blend water and oil in formulas while leaving skin feeling smooth.

Irritation

low

Source

synthetic

beautyskincareemulsifier
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Emulsifier

PPG/PEG-2/10 Glyceryl Cocoate

PPG/PEG-2/10 Glyceryl Cocoate

4.0

A gentle, coconut-derived emulsifier that helps blend oil and water in skincare formulas without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Antioxidant

Pratia Begonifolia Extract

Pratia Begonifolia Extract

3.8

A gentle plant extract with antioxidant potential, but research is limited—best as a supporting ingredient in soothing formulations.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin conditioning agent

Pregnadienol

PREGNADIENOL

3.0

Pregnadienol is a synthetic steroid-like ingredient that may help smooth skin, but its safety and effectiveness are not well-established by independent research.

Irritation

moderate

Source

synthetic

beautyskincareanti-aging
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Solvent

Prenol

PRENOL

3.0

Prenol is a synthetic alcohol used mainly as a solvent or fragrance component; it has little to no proven skincare benefit and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Fragrance Ingredient

Prenyl Acetate

PRENYL ACETATE

3.5

Prenyl acetate is a synthetic fragrance ingredient that adds a fruity, floral note to products, but it offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Prenyl Benzoate

PRENYL BENZOATE

3.5

Prenyl benzoate is a synthetic fragrance ingredient with a low irritation risk, but it offers no skincare benefits beyond scent.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Soothing Agent

Prickly Ash Bark Extract

ZANTHOXYLUM AMERICANUM/CLAVA-HERCULES BARK EXTRACT

3.8

A gentle botanical extract with antioxidant and soothing potential, though research is limited and it may cause sensitivity in rare cases.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Prickly Pear Callus Extract

Opuntia Ficus-Indica Callus Culture Extract

4.0

A gentle, lab-grown cactus extract that may help protect skin from environmental stress and support hydration.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Prickly Pear Flower & Stem Extract

Opuntia Tuna Flower/Stem Extract

4.0

A gentle, antioxidant-rich plant extract that helps soothe and hydrate skin, but its benefits are best supported by traditional use and preliminary studies rather than large-scale clinical trials.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Prickly Pear Flower Extract

Opuntia streptacantha flower extract

4.0

A gentle, plant-based extract that may help calm irritation and defend skin from environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Prickly Pear Fruit Extract

Opuntia Tuna Fruit Extract

4.0

A gentle, antioxidant-rich fruit extract that helps hydrate and soothe the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Prickly Pear Fruit Juice

Opuntia Phaeacantha Fruit Juice

4.0

A gentle, water-based extract that provides hydration and antioxidant protection, especially suitable for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Prickly Pear Fruit Water

Opuntia Ficus-Indica Fruit Water

4.0

A gentle, antioxidant-rich water that hydrates and soothes the skin without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Prickly Pear Leaf Cell Extract

OPUNTIA FICUS-INDICA LEAF CELL EXTRACT

4.0

A gentle, antioxidant-rich extract from prickly pear cactus that may help protect skin from environmental stress and soothe irritation.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Humectant

Prickly Pear Leaf Extract

Opuntia Vulgaris Leaf Extract

4.0

A gentle, plant-based hydrator with antioxidant benefits, ideal for dry or sensitive skin types.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Humectant

Prickly Pear Leaf Juice

Opuntia Robusta Leaf Juice

4.0

A gentle, water-rich humectant that hydrates and soothes skin with antioxidant support, ideal for sensitive or dehydrated skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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Emollient

Prickly Pear Seed Oil

OPUNTIA STRICTA SEED OIL

4.3

A luxurious, non-greasy oil rich in vitamin E and essential fatty acids that hydrates and soothes without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Humectant

Prickly Pear Stem Water

Opuntia Ficus-Indica Stem Water

4.0

A gentle, antioxidant-rich plant water that hydrates and soothes skin without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Prickly Poppy Callus Extract

ARGEMONE MEXICANA CALLUS EXTRACT

3.8

A gentle, plant-derived antioxidant that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Primula Veris Seed Oil

Primula Veris Seed Oil

4.0

A gentle, plant-based oil that helps soften and soothe the skin, though research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Primula Vulgaris Extract

PRIMULA VULGARIS EXTRACT

3.8

A gentle plant extract with antioxidant potential, but research on its specific skin benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Prinsepia Utilis Seed Extract

PRINSEPIA UTILIS SEED EXTRACT

4.0

A gentle, antioxidant-rich seed extract from a Himalayan shrub that helps soothe and nourish the skin without irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Prinsepia Utilis Seed Oil

PRINSEPIA UTILIS SEED OIL

4.0

A gentle, non-greasy plant oil that hydrates and soothes without clogging pores—great for sensitive or oily skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Pristane

PRISTANE

3.8

Pristane is a lightweight, non-greasy oil that softens skin and helps other ingredients absorb, but its use is limited by sourcing and cost.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Privet Fruit Extract

LIGUSTRUM VULGARE FRUIT EXTRACT

3.8

A gentle, antioxidant-rich plant extract that may help protect skin from environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Privet Leaf Extract

Ligustrum Obtusifolium Branch/Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Conditioning Agent

Prolinamidoethyl Imidazole

Prolinamidoethyl Imidazole

3.5

A gentle synthetic ingredient that may help condition skin and hair while offering antioxidant support, but research is still limited.

Irritation

low

Source

synthetic

beautyskincareconditioning agent
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Humectant

Proline

PROLINE

4.0

Proline is a gentle, hydrating amino acid that supports skin structure and moisture retention.

Irritation

low

Source

natural

beautyskincarehumectant
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Anti-aging agent

Prolyl Histamine HCl

PROLYL HISTAMINE HCL

3.5

A synthetic peptide that may help reduce signs of aging and calm skin, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Soothing agent

Promicromonospora Ferment Filtrate

Promicromonospora Ferment Filtrate

4.0

A gentle, fermented bacterial filtrate that may help calm skin and support a balanced microbiome, though research is still early.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Antioxidant

Propagermanium

PROPAGERMANIUM

3.2

Propagermanium is a synthetic antioxidant that may help calm skin and fight free radicals, but research is still early and it is not widely used.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Propellant

Propane

Propane

3.5

Propane is a common aerosol propellant that helps dispense products like dry shampoos and setting sprays, but it offers no direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarepropellant
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Exfoliant

Propane Tricarboxylic Acid

PROPANE TRICARBOXYLIC ACID

3.8

A mild synthetic exfoliant that helps smooth skin and improve radiance, but research is still limited compared to AHAs like glycolic acid.

Irritation

moderate

Source

synthetic

beautyskincareexfoliant
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Humectant

Propanediol

Propanediol

4.5

Propanediol is a gentle, plant-based alternative to propylene glycol that hydrates the skin and helps other ingredients work better.

Irritation

low

Source

natural

beautyskincarehumectant
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