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

Orange Fruit Extract

Citrus Sinensis Fruit Extract

4.0

A gentle antioxidant-rich extract that helps protect skin from environmental stress and adds a subtle brightening effect.

Irritation

low

Source

natural

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Exfoliant

Orange Fruit Powder

Citrus Aurantium Dulcis Fruit Powder

3.8

A gentle, natural exfoliant with antioxidant properties, best for those who prefer fruit-based skincare over synthetic beads or harsh acids.

Irritation

low

Source

natural

beautyskincareexfoliant
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Solvent

Orange Fruit Water

Citrus Sinensis Fruit Water

3.5

A gentle, fragrant botanical water that adds a light citrus scent and mild astringency, but offers limited proven skincare benefits beyond hydration.

Irritation

low

Source

natural

beautyskincarebotanical water
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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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Fragrance

Orange Peel Oil

Citrus Aurantium Peel Oil Expressed

3.8

Orange Peel Oil adds a fresh citrus scent and mild astringent effect, but can be irritating for sensitive skin and increases sun sensitivity.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Exfoliant

Orange Peel Powder

CITRUS AURANTIUM DULCIS PEEL POWDER

3.8

A natural, gentle exfoliant with antioxidant benefits, but may cause irritation for sensitive skin due to citrus oils and coarse texture.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Emollient

Orange Roughy Oil

Hoplostethus Atlanticus Oil

3.5

Orange Roughy Oil is a moisturizing fish oil that can soften skin, but its sustainability and comedogenic potential are concerns.

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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Antimicrobial

Oregano Leaf Oil

ORIGANUM VULGARE LEAF OIL

3.0

Oregano leaf oil is a strong antimicrobial essential oil that can help with acne but is highly irritating and should be used only in very low concentrations.

Irritation

high

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

Oregon Grape Extract

BERBERIS AQUIFOLIUM EXTRACT

3.8

A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing agent

Oregon Grape Root Extract

MAHONIA AQUIFOLIUM ROOT EXTRACT

3.8

A gentle botanical extract with antioxidant and soothing potential, but clinical evidence in skincare is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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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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Emollient

Oriental Poppy Seed Oil

Papaver Orientale Seed Oil

3.8

A gentle, plant-based oil that helps soften and smooth skin, but research on its specific benefits is still limited compared to more common seed oils.

Irritation

low

Source

natural

beautyskincareemollient
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Fragrance

Oriental Sweetgum Balsam Oil

LIQUIDAMBAR ORIENTALIS BALSAM OIL

3.8

A natural balsamic oil that adds a warm, sweet scent to products, but may cause irritation or clog pores in sensitive or acne-prone skin.

Irritation

moderate

Source

natural

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Soothing Agent

Oriental Sweetgum Resin Extract

Liquidambar Orientalis Resin Extract

3.8

A gentle botanical extract with antioxidant and soothing potential, but research is limited and it's not a skincare essential.

Irritation

low

Source

natural

beautyskincarebotanical extract
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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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Soothing Agent

Ormenis Flower Water

Ormenis Mixta Flower Water

3.8

A gentle, aromatic floral water that offers mild soothing and refreshing benefits, but its effectiveness is not as well-studied as more common floral waters like rose or chamomile.

Irritation

low

Source

natural

beautyskincaresoothing
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Soothing agent

Ormenis Multicaulis Extract

Ormenis Multicaulis Extract

3.8

A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Fragrance

Ormenis Multicaulis Flower Oil

Ormenis Multicaulis Flower Oil

3.8

A fragrant, soothing essential oil from a wild chamomile relative, best for those who enjoy natural scents and have non-sensitive skin.

Irritation

moderate

Source

natural

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Soothing Agent

Ormenis Oil

Ormenis Multicaulis Oil

4.0

Ormenis Oil is a gentle, chamomile-like oil that helps calm redness and irritation, making it a good choice for sensitive skin types.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Humectant

Ornithine

Ornithine

3.8

Ornithine is a gentle amino acid that helps maintain skin hydration and supports a healthy skin barrier.

Irritation

low

Source

natural

beautyskincarehumectant
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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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Humectant

Orotic Acid

OROTIC ACID

3.5

Orotic acid is a gentle hydrating ingredient with some antioxidant potential, but research on its topical benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Soothing Agent

Orris Root Extract

Iris Germanica Florentina Root Extract

3.8

A gentle botanical extract with traditional soothing and astringent properties, but limited modern research to back strong skincare claims.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Fragrance

Orris Root Oil

IRIS GERMANICA FLORENTINA ROOT OIL

3.8

Orris root oil adds a delicate floral scent to products but may cause irritation in sensitive skin; its soothing benefits are not well-proven in modern skincare.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Preservative

Ortho-Phenylphenol

O-PHENYLPHENOL

3.0

Ortho-phenylphenol is a synthetic preservative that is effective but carries moderate irritation and regulatory restrictions, especially for leave-on products.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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Absorbent

Orthoclase

ORTHOCLASE

3.5

Orthoclase is a gentle mineral powder that helps absorb oil and improve texture in makeup, but its skincare benefits are minimal.

Irritation

low

Source

natural

beautyskincaretexturizer
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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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Fragrance

Osmanthus Flower Oil

Osmanthus Fragrans Flower Oil

3.8

Osmanthus flower oil adds a lovely floral scent to products, but its skin benefits are not well-studied and it may cause irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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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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Skin conditioning agent

Ostrich Egg Yolk Extract

OSTRICH EGG YOLK EXTRACT

3.5

A novel, nutrient-dense ingredient that may support skin hydration and barrier function, but clinical evidence is still limited.

Irritation

low

Source

natural

beautyskincareconditioning agent
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Soothing agent

Ostrich Fern Bud Powder

Matteuccia struthiopteris bud powder

3.5

A gentle, plant-based powder that may help calm irritated skin and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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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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Soothing Agent

Oubaku Extract

PHELLODENDRON AMURENSE BARK EXTRACT

3.8

Oubaku extract is a gentle botanical with potential soothing and antimicrobial benefits, but human studies are limited.

Irritation

low

Source

natural

beautyskincarebotanical
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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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Emollient

Ouricury Wax

OURICURY WAX

3.8

Ouricury wax is a natural, plant-based wax that helps thicken and stabilize cosmetic products, offering a smooth, glossy finish similar to carnauba wax.

Irritation

low

Source

natural

beautyskincareemollient
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Skin conditioning agent

Ovalicin

Ovalicin

3.8

Ovalicin is a lab-made peptide that may help improve skin firmness and smoothness, but research is still early and it's not a proven alternative to retinoids or vitamin C.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Anti-aging agent

Ovex

Ovex

3.5

Ovex is a synthetic peptide complex that may help improve skin firmness and reduce fine lines, but independent research is limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
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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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Emollient

Ovum Oil

Ovum Oil

3.8

Ovum oil is a natural emollient rich in fatty acids and lecithin, but its comedogenic potential and limited research mean it's best for dry, non-acne-prone skin.

Irritation

low

Source

natural

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Fragrance ingredient

Oxacycloheptadec-10-en-2-one

OXACYCLOHEPTADEC-10-EN-2-ONE

3.8

A synthetic musk that adds a warm, floral scent to products; generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Oxacyclohexadecenone

OXACYCLOHEXADECENONE

3.5

A synthetic fragrance ingredient that provides a pleasant musky scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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pH Adjuster

Oxalic Acid

Oxalic Acid

2.5

Oxalic acid is a strong organic acid rarely used in consumer skincare due to its high irritation potential; it appears mainly in professional chemical peels or as a chelating agent at very low levels.

Irritation

high

Source

natural

beautyskincarepH adjuster
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