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

Opal Ferment Lysate Filtrate

Saccharomyces/Opal Ferment Lysate Filtrate

3.8

A novel fermented ingredient that may offer antioxidant benefits, but research is limited and it's not a proven essential for most routines.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Opacifying Agent

Opal Powder

OPAL POWDER

3.5

Opal powder adds a soft, natural shimmer to makeup but offers no proven skincare benefits beyond aesthetics.

Irritation

low

Source

natural

beautyskincarecosmetic
Read ingredient review

Skin Conditioning

Ophiopogon Extract Stearate

Ophiopogon Japonicus Extract Stearate

3.8

A gentle, semi-synthetic emollient derived from a traditional Asian herb, offering mild skin conditioning with limited but promising research.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Soothing Agent

Ophiopogon Japonicus Root Extract

OPHIOPOGON JAPONICUS ROOT EXTRACT

4.0

A gentle, antioxidant-rich root extract that helps calm irritation and support skin hydration, ideal for sensitive or stressed skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Ophiopogon Japonicus Seed Extract

OPHIOPOGON JAPONICUS SEED EXTRACT

4.0

A gentle botanical extract with antioxidant and soothing potential, best for sensitive or dry skin looking for extra comfort.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Fragrance

Opopanax Oil

OPOPANAX CHIRONIUM RESIN STEAM-DISTILLED OIL

3.8

Opopanax oil adds a warm, balsamic scent to skincare products and may offer mild soothing benefits, but its fragrance components can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Opopanax Resin Extract

OPOPANAX CHIRONIUM RESIN EXTRACT

3.8

Opopanax Resin Extract adds a warm, balsamic scent to products and may offer mild soothing benefits, but research is limited.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Absorbent

Orange Fiber

Citrus Aurantium Sinensis Fiber

4.0

Orange fiber is a natural, gentle ingredient that helps absorb excess oil and improve product texture without clogging pores.

Irritation

low

Source

natural

beautyskincaretexturizer
Read ingredient review

Fragrance

Orange Flower Extract

CITRUS AURANTIUM DULCIS FLOWER EXTRACT

3.8

A gentle, aromatic flower extract that adds a light citrus scent and mild antioxidant benefits to skincare formulas.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Fragrance

Orange Flower Water

Citrus Sinensis Flower Water

3.8

A gentle, aromatic floral water that adds a light scent and mild soothing feel to skincare products, but offers limited active benefits compared to other ingredients.

Irritation

low

Source

natural

beautyskincarebotanical water
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincareemollient
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantimicrobial
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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

beautyskincarefragrance
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincarefragrance
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review