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

Antioxidant

Prostanthera Incisa Leaf Extract

PROSTANTHERA INCISA LEAF EXTRACT

4.0

A gentle botanical extract with antioxidant and soothing potential, best for those seeking natural, plant-based skincare ingredients.

Irritation

low

Source

natural

beautyskincareantioxidant
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Film Former

Protamine Sulfate

PROTAMINE SULFATE

3.5

Protamine sulfate is a gentle film-forming protein that can help condition hair and skin, but its benefits are mild and not well-studied in cosmetics.

Irritation

low

Source

natural

beautyskincarefilm-former
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Humectant

Protea Repens Flower Nectar

PROTEA REPENS FLOWER NECTAR

3.8

A gentle, natural humectant from South African protea flowers that helps hydrate skin, but research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Exfoliant

Protease

Protease

4.0

Protease is an enzyme exfoliant that gently dissolves dead skin cells, but it can be irritating if left on too long or used too frequently.

Irritation

moderate

Source

biotech

beautyskincareexfoliant
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Antioxidant

Protium Pallidum Extract

PROTIUM PALLIDUM EXTRACT

3.8

A gentle, antioxidant-rich botanical extract that may help calm skin and fight free radical damage, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Protocatechualdehyde

Protocatechualdehyde

4.0

A gentle antioxidant that helps defend skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Protocatechuic Acid

3,4-DIHYDROXYBENZOIC ACID

4.0

A gentle antioxidant that helps protect skin from environmental stress and may support a more even tone.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Protodioscin

PROTODIOSCIN

3.5

Protodioscin is a plant saponin with early evidence of antioxidant and anti-inflammatory benefits, but human skincare studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Prunasin

Prunasin

3.0

Prunasin is a plant-derived compound with early research suggesting soothing benefits, but it's not widely studied in cosmetics and requires careful sourcing.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Prunella Vulgaris Extract

PRUNELLA VULGARIS FLOWER/LEAF/STEM EXTRACT

4.0

A gentle botanical extract that may help calm irritation and defend against environmental stress, though more human studies are needed.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Prunus Davidiana Flower Extract

PRUNUS DAVIDIANA FLOWER EXTRACT

3.8

A gentle, antioxidant-rich flower extract that may help calm skin and fight free radicals, though research is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical
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Emollient

Prunus Insititia Seed Oil

PRUNUS INSITITIA SEED OIL

4.2

A gentle, non-greasy plant oil that hydrates and softens skin without clogging pores, making it a good choice for sensitive or acne-prone types.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Prunus Lannesiana Flower Extract

Prunus Lannesiana Flower Extract

3.8

A gentle, antioxidant-rich flower extract that may help calm skin and protect against environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Prunus Mume Bud Extract

Prunus Mume Bud Extract

4.0

A gentle, antioxidant-rich botanical extract from Japanese apricot buds that may help soothe and protect skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Prunus Mume Flower Water

Prunus Mume Flower Water

3.8

A gentle floral water that may offer soothing and antioxidant benefits, but research is limited compared to more established ingredients.

Irritation

low

Source

natural

beautyskincaresoothing
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Exfoliant

Prunus Mume Fruit Vinegar

PRUNUS MUME FRUIT VINEGAR

4.0

A gentle, naturally fermented fruit vinegar that exfoliates and brightens skin without the harshness of stronger acids.

Irritation

low

Source

natural

beautyskincareexfoliant
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Antioxidant

Prunus Mume Root Extract

Prunus Mume Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Prunus Mume Seed Powder

PRUNUS MUME SEED POWDER

4.0

A natural, finely-milled seed powder that gently exfoliates without harsh microbeads, making it a eco-friendly choice for smooth skin.

Irritation

low

Source

natural

beautyskincareexfoliant
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Emollient

Prunus Pedunculata Seed Oil

Prunus Pedunculata Seed Oil

4.0

A gentle, plant-based oil that hydrates and softens skin without clogging pores, though research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Prunus Speciosa Bark Extract

PRUNUS SPECIOSA BARK 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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Antioxidant

Prunus Speciosa Flower Extract

PRUNUS SPECIOSA FLOWER EXTRACT

3.8

A gentle flower extract with antioxidant potential, but research is limited and benefits are not yet proven in human studies.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Prunus Speciosa Leaf Extract

Prunus Speciosa Leaf Extract

4.0

A gentle, plant-derived 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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Skin Conditioning

Prunus Speciosa Leaf Water

PRUNUS SPECIOSA LEAF WATER

3.8

A mild, antioxidant-rich botanical water that hydrates and soothes, but with limited scientific research backing its specific benefits.

Irritation

low

Source

natural

beautyskincarebotanical
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Humectant

Prunus Triloba Fruit Water

PRUNUS TRILOBA FRUIT WATER

3.8

A gentle, water-like ingredient from flowering plum fruit that adds light hydration and a touch of antioxidants, but lacks strong clinical backing.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Prunus Zippeliana Extract

PRUNUS ZIPPELIANA BARK/TWIG EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Pseudoalteromonas Ferment Extract

Pseudoalteromonas Ferment Lysate Extract Filtrate

4.3

A gentle marine probiotic ingredient that calms irritation and strengthens the skin barrier, ideal for sensitive or reactive skin.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Soothing agent

Pseudomonas Ferment Extract

PSEUDOMONAS AEROGINOSA CULTURE CONDITIONED MEDIA EXTRACT

3.5

A bacterial ferment extract that may help calm skin and support the barrier, but research is still early and the ingredient name can sound alarming.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Skin conditioning

Psiadia Altissima Leaf Oil

Psiadia altissima leaf oil

3.8

A gentle botanical oil with early evidence of antioxidant activity, but more research is needed to confirm its benefits for skin.

Irritation

low

Source

natural

beautyskincarebotanical oil
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Humectant

Psicose

PSICOSE

4.0

Psicose is a gentle, natural humectant that helps hydrate skin and may offer antioxidant benefits, though research in cosmetics is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Thickener

Psyllium Husk Powder

PLANTAGO PSYLLIUM HUSK POWDER

3.8

A gentle, plant-based thickener that creates a soothing gel texture, but it can feel sticky if used too high.

Irritation

low

Source

natural

beautyskincarethickener
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Antioxidant

Pteris Dispar Leaf Extract

PTERIS DISPAR LEAF EXTRACT

3.5

A fern-derived extract with antioxidant potential, but research is limited and benefits are not yet well-established in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Pterocarpus Marsupium Extract

PTEROCARPUS MARSUPIUM BARK/WOOD EXTRACT

3.8

A gentle plant extract with antioxidant potential, but research in topical skincare is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Pterocarpus Soyauxii Wood Extract

PTEROCARPUS SOYAUXII WOOD EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Texture Enhancer

PTFE

PTFE

2.5

PTFE adds a silky, smooth feel to makeup but raises environmental and health concerns due to its persistence and potential contamination with PFAS.

Irritation

low

Source

synthetic

beautyskincaretexturizer
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Film Former

PTFE Acetoxypropyl Betaine

Polytetrafluoroethylene Acetoxypropyl Betaine

3.5

A synthetic ingredient that creates a smooth, water-resistant film on skin, but its environmental persistence raises concerns.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Antioxidant

Ptychopetalum Bark/Root Extract

Ptychopetalum Olacoides Bark/Root Extract

3.5

A traditional Amazonian plant extract with promising antioxidant potential, but currently lacks robust human studies to confirm specific skincare benefits.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Ptychopetalum Bark/Stem Extract

PTYCHOPETALUM OLACOIDES BARK/STEM EXTRACT

3.5

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Ptychopetalum Leaf Extract

PTYCHOPETALUM OLACOIDES LEAF EXTRACT

3.8

A gentle, antioxidant-rich Amazonian leaf extract that may help calm skin and defend against environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Pueraria Flower Oil

Pueraria Thunbergiana Flower Oil

3.5

A gentle floral oil with antioxidant potential, but research on its specific skin benefits is still emerging.

Irritation

low

Source

natural

beautyskincareemollient
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Soothing Agent

Pueraria Lobata Root Powder

PUERARIA LOBATA ROOT POWDER

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Pueraria Lobata Symbiosome Ferment

SACCHAROMYCES/PUERARIA LOBATA SYMBIOSOME EXTRACT FERMENT

4.0

A fermented kudzu and yeast extract that may help protect skin from environmental stress and support a healthy-looking complexion.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Pueraria Mirifica Root Ferment

LACTOBACILLUS/PUERARIA MIRIFICA ROOT FERMENT FILTRATE

4.0

A gentle, fermented botanical extract that may help soothe skin and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Pueraria Thomsoni Flower Extract

Pueraria Thomsoni Flower Extract

3.8

A gentle, plant-derived 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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Antioxidant

Puerarin

PUERARIN

3.8

Puerarin is a plant-derived antioxidant that may help calm skin and support collagen, but human studies in cosmetics are still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Film Former

Pullulan

Pullulan

4.2

Pullulan is a gentle, plant-derived film former that gives skin a temporary smooth, tightened feel without clogging pores or causing irritation.

Irritation

low

Source

natural

beautyskincarefilm-former
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Film Former

Pullulan Ferment Extract

AUREOBASIDIUM PULLULANS/SUCROSE FERMENT FILTRATE EXTRACT

4.3

A gentle, natural film-former that hydrates and gives a smooth, plumping feel without stickiness.

Irritation

low

Source

biotech

beautyskincarefilm-former
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Humectant

Pullulan Ferment Filtrate

AUREOBASIDIUM PULLULANS/OLIVE OIL FERMENT FILTRATE

4.0

A gentle, fermented ingredient that helps hydrate and soothe the skin while supporting a healthy moisture barrier.

Irritation

low

Source

biotech

beautyskincarehumectantsoothing
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Soothing agent

Pulsatilla Extract

Pulsatilla Tongkangensis Extract

3.8

A gentle botanical extract with antioxidant potential, though research is limited and mostly traditional.

Irritation

low

Source

natural

beautyskincarebotanical extract
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