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

Fragrance

Sweet Orange Oil

CITRUS AURANTIUM DULCIS OIL

3.8

Sweet Orange Oil adds a bright citrus scent and mild astringent feel, but can irritate sensitive skin and increase sun sensitivity.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Sweet Orange Peel Extract

CITRUS AURANTIUM DULCIS PEEL EXTRACT

4.0

A fragrant, antioxidant-rich extract that can help protect skin from environmental stress, but may irritate sensitive skin due to natural citrus compounds.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Fragrance

Sweet Orange Peel Oil

Citrus Sinensis Peel Oil Expressed

3.8

Sweet Orange Peel Oil adds a fresh citrus scent to products but can be irritating for sensitive skin and may increase sun sensitivity.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Emollient

Sweet Orange Peel Wax

CITRUS AURANTIUM DULCIS PEEL WAX

4.0

A gentle, plant-based wax that helps lock in moisture and gives products a smooth, non-greasy feel.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Sweet Orange Seed Extract

Citrus Aurantium Dulcis Seed Extract

4.0

A gentle antioxidant extract from sweet orange seeds that helps protect skin from environmental stress without causing irritation.

Irritation

low

Source

natural

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Emollient

Sweet Orange Seed Oil

CITRUS AURANTIUM DULCIS SEED OIL

4.0

A gentle, antioxidant-rich oil that hydrates without clogging pores, ideal for normal to dry skin types.

Irritation

low

Source

natural

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Emollient

Sweet Orange Seed Unsaponifiables

CITRUS AURANTIUM DULCIS SEED OIL UNSAPONIFIABLES

4.0

A gentle, lipid-rich fraction of sweet orange seed oil that helps soften and condition skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Sweet Pea Flower Extract

LATHYRUS ODORATUS FLOWER EXTRACT

3.5

A gentle floral extract with potential antioxidant and soothing benefits, but research on its efficacy in skincare is limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Sweet Pea Leaf Extract

LATHYRUS ODORATUS LEAF EXTRACT

3.5

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

Irritation

low

Source

natural

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Antioxidant

Sweet Pea Seed Extract

LATHYRUS ODORATUS SEED 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

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Antioxidant

Sweet Potato Ferment Extract

SACCHAROMYCES/IPOMOEA BATATAS ROOT FERMENT LEES EXTRACT

4.0

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

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Sweet Potato Ferment Filtrate

SACCHAROMYCES/IPOMOEA BATATAS ROOT FERMENT FILTRATE EXTRACT

4.0

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

Irritation

low

Source

biotech

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Antioxidant

Sweet Potato Leaf Extract

Ipomoea Batatas Leaf Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Sweet Potato Leaf/Stem Extract

Ipomoea Batatas Leaf/Stem Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

Sweet Potato Leaf/Stem Powder

Ipomoea Batatas Leaf/Stem Powder

3.8

A gentle, plant-based powder that may offer antioxidant benefits and mild exfoliation, but research on its cosmetic use is still limited.

Irritation

low

Source

natural

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Antioxidant

Sweet Potato Root Extract

Ipomoea Batatas Root Lees Extract

4.0

A gentle, antioxidant-rich extract from sweet potatoes that helps protect skin from environmental stress and supports a calm complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Sweet Potato Root Juice

Ipomoea Batatas Root Juice

4.0

Sweet Potato Root Juice is a gentle, hydrating ingredient that helps soothe and moisturize skin, with antioxidant benefits from natural vitamins and minerals.

Irritation

low

Source

natural

beautyskincarehumectant
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Soothing Agent

Sweet Vernal Grass Extract

Anthoxanthum Odoratum Extract

3.8

A gentle botanical extract with antioxidant and soothing potential, but research is limited and it's primarily used for its pleasant vanilla-like scent.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Sweet Violet Callus Powder

Viola Odorata Callus Powder

3.8

A gentle, plant-based antioxidant from violet cells that may help calm and protect skin, but research is still early.

Irritation

low

Source

biotech

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Soothing Agent

Sweet Violet Extract

VIOLA ODORATA FLOWER/LEAF EXTRACT

3.8

A mild, plant-derived extract that may help calm skin and fight free radical damage, though research is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing Agent

Sweet Violet Flower Extract

VIOLA ODORATA FLOWER EXTRACT

3.8

A mild, plant-based extract that may help calm skin and fight free radical damage, but research is limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing Agent

Sweet Violet Flower Water

VIOLA ODORATA FLOWER WATER

3.8

A gentle floral water that may help calm sensitive skin and provide light hydration, but lacks strong clinical evidence for most claims.

Irritation

low

Source

natural

beautyskincaresoothing
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Emollient

Sweet Violet Leaf Wax

VIOLA ODORATA LEAF WAX

4.0

A gentle plant wax that adds richness and a smooth feel to balms and creams, with low irritation risk.

Irritation

low

Source

natural

beautyskincareemollient
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Fragrance

Sweet Violet Oil

VIOLA ODORATA OIL

3.8

Sweet Violet Oil adds a delicate floral scent and potential soothing benefits, but is used in tiny amounts and may irritate sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Sweet Woodruff Extract

ASPERULA ODORATA FLOWER/LEAF EXTRACT

3.5

A gentle botanical extract with antioxidant potential, but research is limited and it's not a powerhouse ingredient.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Sweetgum & Tribulus & Peony Root Extract

Liquidambar Styraciflua Fruit Extract, Tribulus Terrestris Fruit Extract, Paeonia Lactiflora Root Extract

3.8

A gentle botanical blend that may offer antioxidant and soothing benefits, but research on this specific combination is limited.

Irritation

low

Source

natural

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Soothing Agent

Sweetgum Balsam Extract

Liquidambar Styraciflua Balsam Extract

3.8

A natural balsam extract with soothing potential, but its fragrance components may irritate sensitive skin.

Irritation

moderate

Source

natural

beautyskincaresoothing agent
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Antioxidant

Sweetgum Fruit Extract

Liquidambar Styraciflua Fruit Extract

3.8

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

Irritation

low

Source

natural

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Fragrance

Sweetgum Oil

Liquidambar Styraciflua Oil

3.8

Sweetgum oil adds a warm, balsamic scent to products and may offer mild soothing benefits, but it can be irritating for sensitive skin and is not well-studied in modern skincare.

Irritation

moderate

Source

natural

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Soothing Agent

Swertia Japonica Extract

SWERTIA JAPONICA POWDER

3.8

A gentle botanical extract with antioxidant and soothing potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Humectant

Swiftlet Nest Extract

Swiftlet Nest Extract

3.8

A luxurious natural humectant that may help hydrate and smooth skin, but scientific evidence is limited and ethical sourcing is a concern.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Swiftlet Nest Ferment Filtrate

Saccharomyces/Swiftlet Nest Ferment Filtrate

3.8

A fermented bird's nest ingredient that may support hydration and skin comfort, but human evidence is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Swiss Pine Wood Extract

Pinus Cembra Wood Extract

4.0

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

Irritation

low

Source

natural

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Fragrance

Swiss Stone Pine Leaf/Twig Oil

Pinus Cembra Leaf/Twig Oil

3.8

A fragrant essential oil from Swiss stone pine that adds a fresh scent and may offer mild soothing benefits, but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Swiss Stone Pine Oil

Pinus Cembra Twig Leaf Oil

3.8

A fragrant essential oil from Swiss stone pine that adds a fresh, woodsy scent to products, but may cause irritation in sensitive skin.

Irritation

moderate

Source

natural

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Antioxidant

Sword Bean Extract

CANAVALIA GLADIATA LEAF/VINE EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Sword Bean Fruit Extract

Canavalia gladiata fruit extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Sword Bean Pod Extract

Canavalia gladiata pod extract

3.8

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

Irritation

low

Source

natural

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Soothing Agent

Sycamore Bark Extract

Platanus Occidentalis Bark Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Sycamore Maple Extract

Acer Pseudoplatanus Extract

3.8

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

Irritation

low

Source

natural

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Soothing agent

Symplocos Bark Extract

SYMPLOCOS RACEMOSA BARK EXTRACT

3.8

Symplocos Bark Extract is a gentle botanical with traditional soothing and astringent benefits, but modern research is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Synechococcus Manganese Ferment

SYNECHOCOCCUS/MANGANESE FERMENT

4.0

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

Irritation

low

Source

biotech

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Firming agent

Synephrine

SYNEPHRINE

3.0

Synephrine may offer temporary skin firming effects, but evidence is limited and it can cause irritation, especially at higher concentrations.

Irritation

moderate

Source

natural

beautyskincareactive
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Skin-conditioning agent

Synephrine HCL

SYNEPHRINE HCL

2.5

Synephrine HCL is a synthetic ingredient sometimes added to cosmetics for a temporary tightening sensation, but its effectiveness and safety for topical use are not well-established.

Irritation

moderate

Source

synthetic

beautyskincareactive
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Emollient

Synthetic Beeswax

Synthetic Beeswax

4.0

Synthetic beeswax is a vegan-friendly, stable alternative to natural beeswax that helps thicken and soften products without the risk of allergens.

Irritation

low

Source

synthetic

beautyskincareemollient
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Thickener

Synthetic Candelilla Wax

Synthetic Candelilla Wax

4.0

A vegan-friendly wax alternative that gives lip products and creams a smooth, stable texture without the irritation risk of natural waxes.

Irritation

low

Source

semi-synthetic

beautyskincarecosmetic-wax
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Film Former

Synthetic Carnauba Wax

Synthetic Carnauba

4.0

A vegan-friendly, lab-made wax that gives lipsticks and balms a smooth, glossy finish without the environmental concerns of harvesting natural carnauba.

Irritation

low

Source

synthetic

beautyskincarecosmetic
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Skin-conditioning agent

Synthetic Conotoxin Peptide

S-MU-CONOTOXIN CNIIIC

2.5

A novel synthetic peptide inspired by cone snail venom, marketed as a neurotoxin-like anti-wrinkle ingredient, but with very limited human safety and efficacy data.

Irritation

moderate

Source

synthetic

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Emollient

Synthetic Japan Wax

Synthetic Japan Wax

3.8

A synthetic wax that adds texture and stability to products, generally safe for most skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
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Opacifying Agent

Synthetic Moonstone Powder

Synthetic Moonstone Powder

3.8

A shimmering mineral powder that adds a subtle glow and gentle texture, but offers no skincare benefits beyond aesthetics.

Irritation

low

Source

synthetic

beautyskincarecosmetic
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Occlusive

Synthetic Petrolatum

Synthetic Petrolatum

4.0

Synthetic Petrolatum is a reliable, non-comedogenic occlusive that locks in moisture without the impurities of natural petroleum jelly.

Irritation

low

Source

synthetic

beautyskincareocclusive
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Exfoliant

Synthetic Ruby Powder

Synthetic Ruby Powder

3.8

A gentle, non-irritating physical exfoliant that polishes skin without the sharp edges of natural crystals.

Irritation

low

Source

synthetic

beautyskincareexfoliant
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Antioxidant

Synurus Leaf/Stem Extract

Synurus Palmatopinnatifidus Leaf/Stem Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Syringa Oblata Bark/Leaf Powder

Syringa Oblata Bark/Leaf Powder

3.8

A gentle plant powder that may offer antioxidant benefits, but research on its specific effects in skincare is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Syringaldehyde

SYRINGALDEHYDE

3.8

Syringaldehyde is a gentle antioxidant from plants that may help protect skin from environmental stress, but research on its topical benefits is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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