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

Abrasive

Sand

SAND

3.5

Sand is a natural physical exfoliant that can smooth skin, but its rough texture may cause micro-tears if used too aggressively.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Soothing agent

Sandalwood Extract

SANTALUM ALBUM (SANDALWOOD) EXTRACT

4.0

Sandalwood extract is a gentle, aromatic botanical that helps calm skin and provides antioxidant protection, but its benefits are best supported by traditional use rather than extensive modern clinical studies.

Irritation

low

Source

natural

beautyskincarebotanical
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Fragrance

Sandalwood Oil

SANTALUM ALBUM WOOD OIL

4.0

Sandalwood oil is a gentle, aromatic oil that may help calm skin and provide a pleasant scent, but it is primarily used for fragrance.

Irritation

low

Source

natural

beautyskincarefragrance
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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

beautyskincareantioxidant
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Exfoliant

Sandalwood Shell Powder

SANTALUM SPICATUM SHELL POWDER

3.8

A gentle, natural exfoliating powder from Australian sandalwood nut shells, best for physical scrubs and masks.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing Agent

Sandalwood Wood Extract

SANTALUM ALBUM WOOD EXTRACT

4.0

A gentle, aromatic wood extract that helps calm irritation and fight environmental stress, but its benefits are mostly supported by traditional use and limited modern studies.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Exfoliant

Sandalwood Wood Powder

SANTALUM ALBUM WOOD POWDER

3.8

A gentle, natural exfoliating powder that can also help absorb excess oil and soothe the skin.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing Agent

Sanicula Extract

Sanicula Europaea Flower/Leaf/Stem Extract

3.5

A gentle botanical extract with traditional use for soothing skin, but modern research is limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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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

beautyskincareantioxidant
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Fragrance

Santalol

SANTALOL

4.0

Santalol is a gentle, naturally derived fragrance and soothing ingredient from sandalwood, but its benefits are mostly aromatic rather than therapeutic.

Irritation

low

Source

natural

beautyskincarefragrance
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Emollient

Santalum Spicatum Seed Oil

SANTALUM SPICATUM SEED OIL

4.0

A gentle, non-greasy oil that hydrates and soothes skin without clogging pores, ideal for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincareemollient
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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

beautyskincareantioxidant
Read ingredient review

Fragrance

Santalyl Acetate

SANTALYL ACETATE

3.8

Santalyl Acetate is a synthetic fragrance ingredient that adds a sandalwood-like scent to products; it is generally considered safe at low concentrations but offers no direct skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
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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

beautyskincareantioxidant
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Cleansing Agent

Saponified Rose Geranium Extract

PELARGONIUM GRAVEOLENS LEAF EXTRACT SAPONIFIED

3.8

A gentle, plant-derived cleansing ingredient with a pleasant rose-like scent, best suited for rinse-off products.

Irritation

low

Source

natural

beautyskincarecleansing agent
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Soothing Agent

Saposhnikovia Root Extract

SAPOSHNIKOVIA DIVARICATA ROOT EXTRACT

4.0

A gentle, plant-based root extract that may help calm irritated skin and provide antioxidant protection, though human studies are limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Emollient

Sapote Seed Butter

Pouteria Sapota Seed Butter

4.0

A gentle, plant-based butter that hydrates and softens skin without feeling overly greasy.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Sapote Seed Oil

Pouteria Sapota Seed Oil

4.0

A gentle, plant-based oil that hydrates and softens skin without clogging pores, though research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
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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

beautyskincareantioxidant
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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

beautyskincareantioxidant
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Opacifying Agent

Sapphire Extract

Sapphire Extract

3.5

Sapphire Extract adds a subtle shimmer and gentle physical exfoliation, but its skincare benefits beyond appearance are not well-studied.

Irritation

low

Source

natural

beautyskincaremineral
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Emollient

Sapucainha Oil Derivative

Hydroxycyclohexyl Ethyltrisiloxane Sapucainhate

3.8

A novel silicone-like emollient from sapucainha oil that provides a silky, non-greasy feel with minimal irritation risk.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Humectant

Sarcodiotheca Extract

SARCODIOTHECA GAUDICHAUDII EXTRACT

3.8

A gentle red seaweed extract that helps hydrate and calm the skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Sarcosine

Sarcosine

4.0

Sarcosine is a gentle, naturally derived amino acid that helps hydrate and condition the skin, with some research suggesting it may support collagen production.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Sargassum Filipendula Extract

SARGASSUM FILIPENDULA EXTRACT

4.0

A gentle seaweed extract that helps calm and hydrate the skin, with antioxidant benefits from its natural mineral content.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Sargassum Seaweed Extract

Sargassum Vulgare Extract

3.8

A gentle, mineral-rich seaweed extract that helps soothe and hydrate the skin, but its benefits are backed by limited human studies.

Irritation

low

Source

natural

beautyskincaresoothing agent
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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

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Sarsasapogenin

SARSASAPOGENIN

3.5

Sarsasapogenin is a plant-based compound that may help calm skin and support the skin barrier, but research is still early and it's not a proven powerhouse ingredient.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

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

beautyskincareantioxidant
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Soothing agent

Sasa Kurilensis Water

Sasa Kurilensis Water

3.8

A gentle, antioxidant-rich bamboo water that soothes skin and provides light hydration, but research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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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

beautyskincareantioxidant
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Soothing Agent

Sasa Veitchii Extract

SASA VEITCHII EXTRACT

3.8

A gentle bamboo leaf extract with antioxidant and soothing potential, but human skin research is still limited.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Antioxidant

Sasa Veitchii Leaf Extract

SASA VEITCHII LEAF EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Sasa Veitchii Leaf Powder

SASA VEITCHII LEAF POWDER

3.8

A gentle, antioxidant-rich botanical powder from Japanese bamboo that may help soothe and protect skin, though human studies are limited.

Irritation

low

Source

natural

beautyskincarebotanical
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Soothing Agent

Sasa Veitchii Leaf/Stem Water

SASA VEITCHII LEAF/STEM WATER

3.8

A gentle, antioxidant-rich bamboo water that soothes and hydrates, but research on its specific benefits is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Antioxidant

Saskatoon Berry Extract

AMELANCHIER ALNIFOLIA FRUIT EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Saskatoon Berry Flower Extract

AMELANCHIER ALNIFOLIA FLOWER EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Astringent

Sassafras Bark Extract

SASSAFRAS OFFICINALE BARK EXTRACT

3.5

Sassafras Bark Extract may offer astringent and soothing benefits, but its use is limited by safety concerns and lack of robust research.

Irritation

moderate

Source

natural

beautyskincarebotanical extract
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Fragrance

Sassafras Bark/Root Extract

Sassafras Officinale Bark/Root Extract

2.5

Sassafras extract is a traditional botanical with potential skin benefits, but its use is limited by safety concerns related to the compound safrole, which is restricted in many countries.

Irritation

moderate

Source

natural

beautyskincarebotanical extract
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Fragrance

Sassafras Root Oil

SASSAFRAS OFFICINALE ROOT OIL

1.5

Sassafras Root Oil is a fragrant essential oil that is largely avoided in modern skincare due to safety concerns over its main component, safrole, which is regulated as a potential carcinogen.

Irritation

high

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Satsuma Ferment Filtrate

Citrus Unshiu Fruit Juice Ferment Extract Filtrate

4.0

A gentle, antioxidant-rich fermented citrus extract that may help brighten and protect skin, but research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Fragrance

Satsuma Flower Oil

Citrus Unshiu Flower Oil

3.8

Satsuma Flower Oil adds a fresh citrus scent and mild astringent feel, but its fragrance components can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Satsuma Flower Water

CITRUS UNSHIU FLOWER WATER

3.8

A gentle, lightly fragrant floral water that can refresh and mildly tone the skin, but its benefits are subtle and not backed by strong research.

Irritation

low

Source

natural

beautyskincarebotanical water
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Fragrance

Satsuma Mandarin Fruit Oil

CITRUS UNSHIU FRUIT OIL

3.8

A fragrant citrus oil that can brighten the complexion but may cause irritation in sensitive skin due to natural limonene content.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Exfoliant

Satsuma Mandarin Fruit Powder

Citrus Unshiu Fruit Powder

3.8

A gentle fruit powder that offers mild exfoliation and antioxidant benefits, but its effects are not as well-studied as more common citrus extracts.

Irritation

low

Source

natural

beautyskincareexfoliantantioxidant
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Skin-Conditioning Agent

Satsuma Mandarin Fruit Water

Citrus Unshiu Fruit Water

3.5

A gentle, water-based citrus extract that adds light antioxidant benefits and a subtle natural scent, but its effects are mild and not well-studied in skincare.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Satsuma Mandarin Peel Extract

CITRUS UNSHIU PERICARP EXTRACT

4.0

A gentle, antioxidant-rich peel extract that can help brighten skin and protect against environmental stress without common citrus irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Fragrance

Satsuma Peel Oil

Citrus Unshiu/Aurantium Peel Oil

3.8

Satsuma Peel Oil adds a fresh citrus scent and mild antioxidant benefits, but its fragrance components can irritate sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Saururus Chinensis Extract

SAURURUS CHINENSIS LEAF/STEM EXTRACT

4.0

A gentle botanical extract with antioxidant and soothing potential, best for those seeking plant-based calming ingredients.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Saururus Chinensis Flower Extract

Saururus Chinensis Flower Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing Agent

Saururus Chinensis Root Extract

SAURURUS CHINENSIS ROOT EXTRACT

3.8

A gentle plant root extract with early evidence of soothing and antioxidant benefits, but more human studies are needed.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review