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

Russula Virescens Extract

RUSSULA VIRESCENS EXTRACT

3.8

A mushroom extract with antioxidant potential, but research is limited—promising but not proven.

Irritation

low

Source

natural

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Antioxidant

Rutin

RUTIN

4.0

Rutin is a gentle plant antioxidant that helps defend skin against environmental damage and may support a more even skin tone.

Irritation

low

Source

natural

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Antioxidant

Rutinyl Succinate

Rutinyl Succinate

3.8

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

Irritation

low

Source

semi-synthetic

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Antioxidant

Rye Adventitious Root Extract

Secale Cereale Adventitious Root Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Rye Callus Extract

Secale Cereale Callus Extract

4.0

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

Irritation

low

Source

biotech

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Soothing Agent

Rye Phytoplacenta Ferment Filtrate

SECALE CEREALE PHYTOPLACENTA CULTURE EXTRACT FILTRATE

3.8

A gentle, plant-based ferment that may help calm skin and fight free radicals, but research is still emerging.

Irritation

low

Source

biotech

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Antioxidant

Rye Seed Extract

Secale Cereale Seed Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

S-Allylcysteine

S-Allylcysteine

3.8

S-Allylcysteine is a gentle antioxidant from aged garlic that may help protect skin from oxidative stress and soothe inflammation, but research in topical cosmetics is still early.

Irritation

low

Source

natural

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Antioxidant

S-Glyoxyloyl Acetyl Cysteine

S-GLYOXYLOYL ACETYL CYSTEINE

3.8

A promising but under-researched antioxidant that may help protect skin from environmental stress and support a more even tone.

Irritation

low

Source

semi-synthetic

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Antioxidant

S-Lactoylglutathione

S-Lactoylglutathione

4.0

S-Lactoylglutathione is a gentle antioxidant that may help brighten skin and protect against environmental stress, but research is still early.

Irritation

low

Source

biotech

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Antioxidant

S-Olivoyl Glutathione

S-Olivoyl Glutathione

4.0

A stabilized, oil-friendly form of glutathione that may help brighten skin and fight oxidative stress, though human studies are still limited.

Irritation

low

Source

semi-synthetic

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Antioxidant

S-Palmitoyl Glutathione

S-Palmitoyl Glutathione

4.0

A fat-soluble form of glutathione that may help brighten skin and fight oxidative stress, but human evidence is still limited.

Irritation

low

Source

semi-synthetic

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Antioxidant

S-Stearoyl Glutathione

S-Stearoyl Glutathione

4.0

A promising antioxidant that may help brighten skin and fight free radicals, but research is still limited compared to more established ingredients.

Irritation

low

Source

semi-synthetic

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Antioxidant

Saccharomyces/Gold Ferment

SACCHAROMYCES/GOLD FERMENT

3.8

A trendy fermented gold ingredient that may offer antioxidant benefits, but research is limited and its high cost doesn't guarantee superior results over simpler antioxidants.

Irritation

low

Source

biotech

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Antioxidant

Saccharomyces/Manganese Ferment

SACCHAROMYCES/MANGANESE FERMENT

4.0

A gentle, biotech-derived antioxidant that may help protect skin from environmental stress, though human research is still limited.

Irritation

low

Source

biotech

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Antioxidant

Sacred Fig Stem Extract

Ficus Religiosa Stem 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

Sacred Lotus Flower Extract

Nelumbium Speciosum Flower Extract

4.0

A gentle, antioxidant-rich botanical extract that helps soothe and protect the skin from environmental stress.

Irritation

low

Source

natural

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Antioxidant

Safflower Bud Extract

CARTHAMUS TINCTORIUS BUD EXTRACT

4.0

A gentle, antioxidant-rich plant extract that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

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Antioxidant

Safflower Callus Extract

CARTHAMUS TINCTORIUS CALLUS EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Safflower Seedcake Extract

CARTHAMUS TINCTORIUS SEEDCAKE EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Safflower Sprout Extract

Carthamus Tinctorius Sprout Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

Saffron Callus Extract

Crocus Sativus Callus Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

Saffron Flower Extract

Crocus Sativus Flower Extract

4.0

A gentle, antioxidant-rich botanical extract that may help brighten skin and fight free radical damage, but its high cost and limited clinical data mean it's often used more for marketing than proven results.

Irritation

low

Source

natural

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Antioxidant

Saffron Leaf Cell Culture Extract

Crocus Sativus Leaf Cell Culture Extract

4.0

A gentle, lab-grown saffron extract that may help protect skin from environmental stress and calm irritation, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Saffron Meristem Cell Extract

Crocus Sativus Meristem Cell Extract

4.0

A gentle plant stem cell extract that may help protect skin from environmental stress and support a more even tone.

Irritation

low

Source

natural

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Antioxidant

Saffron Style Extract

Crocus Sativus Style Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

Sage Extract

Salvia Officinalis Flower/Leaf/Stem Extract

4.0

Sage extract offers antioxidant and soothing benefits, but its astringent properties may be drying for some skin types.

Irritation

low

Source

natural

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Antioxidant

Sage Juice

Salvia Officinalis Flower/Leaf/Stem Juice

3.8

Sage juice is a gentle, antioxidant-rich water extract that can help soothe and protect skin, but it is not a powerhouse active and may cause sensitivity in rare cases.

Irritation

low

Source

natural

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Antioxidant

Sage Leaf Extract

Salvia Officinalis Leaf Extract

4.0

Sage leaf extract offers antioxidant protection and mild soothing benefits, but its astringent properties may be drying for some skin types.

Irritation

low

Source

natural

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Antioxidant

Sage Root Extract

Salvia Officinalis Root Extract

3.8

Sage root extract is a gentle antioxidant that may help calm skin and protect against environmental stress, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Sageretia Thea Leaf Extract

Sageretia Thea Leaf Extract

3.8

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

Irritation

low

Source

natural

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Humectant

Saguaro Flower Extract

Carnegiea Gigantea Flower Extract

3.8

A gentle, plant-based extract that adds hydration and antioxidant protection, but research on its specific benefits is still limited.

Irritation

low

Source

natural

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Humectant

Sahel Scenedesmus Extract

Scenedesmus Extract

4.0

A gentle, hydrating microalgae extract with antioxidant potential, best for soothing and moisturizing sensitive skin.

Irritation

low

Source

natural

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Antioxidant

Sakhalin Fir Leaf Extract

Abies sachalinensis leaf extract

4.0

A gentle, antioxidant-rich plant extract that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

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Antioxidant

Sakhalin Raspberry Fruit Juice

RUBUS IDAEUS SACHALINENSIS FRUIT JUICE

3.8

A gentle, antioxidant-rich fruit juice from a wild raspberry that may help soothe and protect skin, but research is limited.

Irritation

low

Source

natural

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Antioxidant

Salacia Reticulata Root Extract

Salacia Reticulata Root Extract

3.8

A gentle, antioxidant-rich root extract 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

Salacia Reticulata Wood Extract

Salacia Reticulata Wood Extract

3.8

A gentle, antioxidant-rich wood 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

Salad Burnet Extract

Sanguisorba Minor Extract

3.8

A gentle botanical extract with antioxidant and soothing potential, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Salcolin

Salcolin

3.5

Salcolin is a plant antioxidant with some soothing potential, but research is still early and it's not widely used in mainstream skincare.

Irritation

low

Source

natural

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Antioxidant

Salvianolic Acid B

Salvianolic Acid B

4.0

A plant-derived antioxidant that helps calm skin and fight free radical damage, but research is still emerging for topical use.

Irritation

low

Source

natural

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Antioxidant

Sambucus Stem Extract

Sambucus Williamsii Stem 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

Sandalwood Seed Extract

SANTALUM ALBUM SEED EXTRACT

4.0

A gentle, antioxidant-rich extract from sandalwood seeds that helps calm and protect the skin without the strong scent of sandalwood oil.

Irritation

low

Source

natural

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Antioxidant

Sansho Berry Extract

ZANTHOXYLUM PIPERITUM FRUIT EXTRACT

3.8

Sansho Berry Extract is a gentle antioxidant-rich botanical that may help calm skin and protect against environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Santalum Spicatum Wood Extract

FUSANUS SPICATUS WOOD EXTRACT

4.0

A gentle, aromatic wood extract that helps calm skin and fight free radical damage, but its benefits are mostly supported by traditional use and limited clinical studies.

Irritation

low

Source

natural

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Antioxidant

Sapodilla Fruit/Seed Extract

Achras Sapota Fruit/Seed Extract

3.8

A gentle plant extract with antioxidant potential, but research is still emerging—think of it as a supportive ingredient rather than a star performer.

Irritation

low

Source

natural

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Antioxidant

Sappan Wood Bark Extract

Caesalpinia Sappan Bark Extract

4.0

A gentle, antioxidant-rich bark extract that may help calm skin and protect against environmental stress.

Irritation

low

Source

natural

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Antioxidant

Sappan Wood Stem Extract

Caesalpinia Sappan Stem Extract

4.0

A gentle botanical extract with antioxidant and soothing benefits, best for those seeking plant-based protection against environmental stress.

Irritation

low

Source

natural

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Antioxidant

Sargachromanol A

Sargachromanol A

3.8

A promising marine antioxidant from brown algae with early research suggesting anti-aging and protective benefits, but human studies are still limited.

Irritation

low

Source

natural

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Antioxidant

Sargachromanol B

Sargachromanol B

3.8

A promising seaweed antioxidant that may help protect skin from environmental damage, but human research is still limited.

Irritation

low

Source

natural

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Antioxidant

Sargachromanol C

Sargachromanol C

3.8

A promising marine antioxidant from brown algae that may help defend skin against environmental damage, though human studies are still limited.

Irritation

low

Source

natural

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Antioxidant

Sargachromanol D

Sargachromanol D

3.8

A promising marine antioxidant from brown seaweed that may help protect skin from UV and pollution damage, but human research is still limited.

Irritation

low

Source

natural

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Antioxidant

Sargachromanol E

Sargachromanol E

3.8

A promising seaweed antioxidant that may help shield skin from pollution and UV damage, but human studies are still limited.

Irritation

low

Source

natural

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Antioxidant

Sargachromanol F

Sargachromanol F

3.8

A promising seaweed antioxidant that may help defend skin against pollution and UV damage, but human research is still limited.

Irritation

low

Source

natural

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Antioxidant

Sargent Cherry Fruit Extract

Prunus sargentii fruit extract

3.8

A gentle, antioxidant-rich fruit extract that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Sasa Kurilensis Extract

SASA KURILENSIS LEAF/STEM EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Sasa Palmata Leaf Extract

Sasa Palmata Leaf Extract

4.0

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

Irritation

low

Source

natural

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