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 4,092
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

Orange Juice

CITRUS AURANTIUM DULCIS JUICE

3.8

Orange juice can offer mild brightening and antioxidant benefits, but its acidity and potential for irritation make it better suited for rinse-off products or well-formulated leave-on treatments.

Irritation

moderate

Source

natural

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Antioxidant

Orange Mushroom Mycelium Extract

CLITOCYBE AURANTIACA MYCELIUM EXTRACT

3.5

A mushroom-derived extract with antioxidant potential, but research is limited and it's not a proven skincare powerhouse.

Irritation

low

Source

natural

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Antioxidant

Orange Peel Extract

CITRUS AURANTIUM SINENSIS PEEL EXTRACT

4.0

Orange peel extract offers antioxidant protection and a fresh scent, but its benefits are mild and it may cause sensitivity in very reactive skin.

Irritation

low

Source

natural

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Antioxidant

Orchid Flower Extract

PHALAENOPSIS SHIUH-DONG WHISHKEY FLOWER EXTRACT

3.5

A gentle, antioxidant-rich orchid extract that may help soothe and protect skin, but research is still limited.

Irritation

low

Source

natural

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Antioxidant

Orchid Leaf/Root/Stem Extract

Orchid Leaf/Root/Stem Extract

3.8

A gentle, antioxidant-rich botanical extract that may help soothe and protect skin, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Orchid Stem & Leaf Extract

BRASSOCATTLEYA MARCELLA KOSS LEAF/STEM EXTRACT

3.8

A gentle, plant-based antioxidant that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Orchid Stem & Moth Orchid Extract

Dendrobium nobile/Phalaenopsis amabilis extract

3.8

A gentle orchid extract blend that may offer antioxidant and hydrating benefits, but human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Orchis Morio Flower Extract

Orchis Morio Flower Extract

3.8

A gentle, antioxidant-rich flower extract that may help soothe and protect skin, though research is limited.

Irritation

low

Source

natural

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Antioxidant

Oregano & Rose Flower Extract

ORIGANUM VULGARE LEAF/ROSA CENTIFOLIA FLOWER EXTRACT

3.8

A gentle botanical duo that may help calm skin and fight free radicals, but research is limited and fragrance-sensitive users should patch test.

Irritation

low

Source

natural

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Antioxidant

Oregano Extract

ORIGANUM VULGARE FLOWER/LEAF/STEM EXTRACT

3.8

Oregano extract offers antioxidant benefits but can be irritating for sensitive skin due to its potent phenolic compounds.

Irritation

moderate

Source

natural

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Antioxidant

Oregano Flower Extract

ORIGANUM VULGARE FLOWER EXTRACT

3.8

Oregano flower extract is a gentle antioxidant that may help protect skin from environmental stress, but it is not a substitute for proven treatments.

Irritation

low

Source

natural

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Antioxidant

Oregano Water

ORIGANUM VULGARE FLOWER/LEAF/STEM WATER

3.5

Oregano water is a gentle, aromatic hydrosol with antioxidant potential, but its antimicrobial compounds may irritate sensitive skin.

Irritation

moderate

Source

natural

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Antioxidant

Oridonin

ORIDONIN

3.5

Oridonin is a plant-based antioxidant with early research suggesting soothing and protective benefits, but it's not yet widely studied in human skincare.

Irritation

low

Source

natural

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Antioxidant

Oriental Bittersweet Extract

CELASTRUS ORBICULATUS BRANCH/LEAF EXTRACT

3.5

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

Irritation

low

Source

natural

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Antioxidant

Oriental Cattail Extract

Typha Orientalis Extract

3.8

A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.

Irritation

low

Source

natural

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Antioxidant

Origanum Heracleoticum Flower Oil

ORIGANUM HERACLEOTICUM FLOWER OIL

3.8

A potent botanical oil with strong antioxidant and antimicrobial activity, best used in low concentrations and with caution for sensitive skin.

Irritation

moderate

Source

natural

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Antioxidant

Orostachys Japonica Callus Extract

OROSTACHYS JAPONICA CALLUS EXTRACT

4.0

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

Irritation

low

Source

natural

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Antioxidant

Osajin

Osajin

3.8

Osajin is a plant-derived antioxidant that may help protect skin from environmental stress, but research is still early and it's not widely used in mainstream products.

Irritation

low

Source

natural

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Antioxidant

Osbeckia Chinensis Extract

Osbeckia Chinensis Extract

3.8

A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.

Irritation

low

Source

natural

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Antioxidant

Osmanthus Leaf Extract

Osmanthus Fragrans Leaf Extract

3.8

A gentle plant extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Ostrich Fern Extract

Matteuccia struthiopteris extract

3.8

Ostrich fern extract is a gentle, antioxidant-rich ingredient that may help calm skin and protect against environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Ouren Ekisu

Ouren Ekisu

4.0

A gentle, plant-derived antioxidant that helps calm skin and fight environmental damage, but research is mostly lab-based.

Irritation

low

Source

natural

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Antioxidant

Ovotransferrin

Ovotransferrin

3.8

Ovotransferrin is a gentle egg-derived protein that may help protect skin from oxidative stress and support a balanced microbiome.

Irritation

low

Source

natural

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Antioxidant

Oxalis Callus Culture Extract

Oxalis Hedysaroides Callus Culture Extract

3.8

A gentle, lab-grown plant extract that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Oxalis Triangularis Extract

Oxalis Triangularis Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Oxeye Daisy Callus Powder

LEUCANTHEMUM VULGARE CALLUS POWDER

3.8

A gentle, antioxidant-rich plant ingredient from oxeye daisy cells that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Oxidized Alpinia Zerumbet Ferment

OXIDIZED ALPINIA ZERUMBET STEM FERMENT FILTRATE

3.8

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

Irritation

low

Source

natural

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Antioxidant

Oxidized Glutathione

Glutathione Disulfide

3.5

Oxidized glutathione is a less active form of glutathione that may support skin brightening and antioxidant protection, but its effectiveness in topical products is still being studied.

Irritation

low

Source

natural

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Antioxidant

Oxidized Lemongrass Leaf Extract

CYMBOPOGON CITRATUS LEAF EXTRACT OXIDIZED

3.5

A gentle, antioxidant-rich extract from lemongrass that may help soothe skin and fight free radicals, but research on the oxidized form is limited.

Irritation

low

Source

natural

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Antioxidant

Oxiria Digyna Callus Extract

Oxiria Digyna Callus Extract

3.8

A plant-based biotech ingredient with antioxidant potential, but research is still early and benefits are not yet proven in human studies.

Irritation

low

Source

biotech

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Antioxidant

Oxiria Digyna Extract

Oxiria Digyna Extract

3.5

A gentle botanical extract with antioxidant potential, but research is limited and benefits are not well-established.

Irritation

low

Source

natural

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Antioxidant

Oxodeoxy Guanosine

Oxodeoxy Guanosine

3.8

A lab-made nucleotide that may help protect skin DNA from oxidative stress, but human skincare evidence is still limited.

Irritation

low

Source

synthetic

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Antioxidant

Oxothiazolidine

Oxothiazolidine

3.5

A synthetic antioxidant that may help protect skin from environmental stress, but research is still limited.

Irritation

low

Source

synthetic

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Antioxidant

Oxothiazolidinecarboxylic Acid

OXOTHIAZOLIDINECARBOXYLIC ACID

4.0

A promising antioxidant ingredient that helps your skin make its own glutathione, but research is still emerging compared to more established antioxidants like vitamin C.

Irritation

low

Source

synthetic

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Antioxidant

Oxydendron Arboreum Callus Extract

Oxydendron Arboreum Leaf/Stem Callus Culture 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

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Antioxidant

Oxygen

Oxygen

3.5

Oxygen in skincare is more about marketing than proven skin benefits; it may offer a temporary refreshing sensation but lacks strong evidence for lasting effects.

Irritation

low

Source

natural

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Antioxidant

Oyster Plant Extract

Mertensia Maritima Extract

3.8

A gentle, ocean-inspired extract that may help calm skin and fight free radicals, though research is still early.

Irritation

low

Source

natural

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Emollient

Ozonized Meadowfoam Seed Oil

OZONIZED MEADOWFOAM SEED OIL

3.8

Ozonized meadowfoam seed oil is a unique, oxygen-enriched oil that may help calm skin and support a clearer complexion, though research is still emerging.

Irritation

low

Source

semi-synthetic

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Antioxidant

Ozonized Prickly Pear Callus Extract

OZONIZED OPUNTIA FICUS INDICA CALLUS CULTURE EXTRACT

3.5

A novel biotech ingredient with antioxidant potential, but research is very limited and it's rarely found in mainstream products.

Irritation

low

Source

biotech

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Antioxidant

Ozonized Rice Callus Extract

OZONIZED ORYZA SATIVA CALLUS CULTURE EXTRACT

3.8

A novel biotech ingredient that combines rice callus extract with ozone for antioxidant and soothing benefits, but research is still emerging.

Irritation

low

Source

biotech

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Antioxidant

Ozonized Yeast Ferment Filtrate

Ozonized Saccharomyces Ferment Lysate Filtrate

3.8

A novel fermented yeast ingredient with ozonation that may support skin antioxidant defenses, but human research is still limited.

Irritation

low

Source

biotech

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Antioxidant

P-Cymene

P-CYMENE

3.8

P-Cymene is a plant-derived antioxidant that may help protect skin from environmental stress, but research on its topical benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

p-Hydroxyanisole

P-HYDROXYANISOLE

3.5

p-Hydroxyanisole is a synthetic stabilizer that prevents oils from going rancid, but it may cause irritation in sensitive individuals at higher concentrations.

Irritation

moderate

Source

synthetic

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Antioxidant

p-Methoxycinnamaldehyde

P-METHOXYCINNAMALDEHYDE

3.5

A plant-derived aromatic compound with antioxidant potential, but its strong scent and moderate irritation risk limit its use in skincare.

Irritation

moderate

Source

natural

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Antioxidant

Paecilomyces Japonica Ferment Extract

PAECILOMYCES JAPONICA/CYNANCHUM WILFORDII ROOT FERMENT EXTRACT FILTRATE

3.8

A fermented blend of a medicinal mushroom and a root extract that may offer antioxidant and soothing benefits, though research is still emerging.

Irritation

low

Source

biotech

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Antioxidant

Paeonol

PAEONOL

4.0

Paeonol is a gentle antioxidant from peony that may help calm skin and fight environmental stress, but human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Pale Goosefoot Seed Extract

Chenopodium pallidicaule seed extract

3.8

A gentle, plant-derived antioxidant that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Pale Iris Leaf Cell Extract

Iris Pallida Leaf Cell Extract

4.0

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

Irritation

low

Source

biotech

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Antioxidant

Palm Fruit Extract

Elaeis Guineensis Fruit Extract

3.8

A gentle antioxidant-rich fruit extract that helps protect skin from environmental stress while providing light hydration.

Irritation

low

Source

natural

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Humectant

Palmaria Palmata Powder

Palmaria Palmata Powder

4.0

A gentle, nutrient-packed seaweed powder that hydrates and soothes skin without irritation.

Irritation

low

Source

natural

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Antioxidant

Palmatine

Palmatine

3.8

Palmatine is a plant-derived alkaloid with antioxidant and anti-inflammatory potential, but research in topical skincare is still emerging.

Irritation

low

Source

natural

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Antioxidant

Palmitoyl Cocoa Seed Extract

Palmitoyl Cocoa Seed Extract

3.8

A gentle, semi-synthetic antioxidant that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

semi-synthetic

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Antioxidant

Palmitoyl Coffee Bean Extract

Palmitoyl Coffee Bean Extract

4.0

A promising antioxidant ingredient that pairs coffee's polyphenols with a fatty acid for better skin penetration, though research is still limited.

Irritation

low

Source

semi-synthetic

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Antioxidant

Palmitoyl Grape Seed Extract

Palmitoyl Grape Seed Extract

4.0

A stabilized antioxidant ingredient that helps protect skin from environmental stress and supports a more even-looking complexion.

Irritation

low

Source

semi-synthetic

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Antioxidant

Palmitoyl Green Tea Extract

PALMITOYL CAMELLIA SINENSIS EXTRACT

4.0

A stabilized, oil-friendly version of green tea extract that brings antioxidant and soothing power to formulas without the instability of plain green tea.

Irritation

low

Source

semi-synthetic

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