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

Soothing Agent

Smilax Lancefolia Root Powder

Smilax Lancefolia Root/Stalk Powder

3.5

A gentle botanical powder with potential soothing and antioxidant benefits, but research is limited and it's not a standout ingredient.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Soothing Agent

Smilax Medica Root Extract

Smilax Medica Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Soothing Agent

Smilax Utilis Root Extract

Smilax Utilis Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing agent

Smilo Grass Extract

ORYZOPSIS MILIACEA EXTRACT

3.8

Smilo Grass Extract is a gentle, plant-based ingredient that may help calm irritated skin and provide antioxidant support, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Smithsonite Extract

Smithsonite Extract

3.0

Smithsonite is a mineral source of zinc carbonate, offering potential soothing and oil-absorbing benefits, but research on its cosmetic use is very limited.

Irritation

low

Source

natural

beautyskincaremineral
Read ingredient review

Antioxidant

Smoke Tree Branch/Leaf Oil

Cotinus coggygria branch/leaf oil

4.0

A gentle, antioxidant-rich oil from the smoke tree that may help calm skin and fight free radical damage, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Smoke Tree Leaf Extract

Cotinus Coggygria Leaf Extract

4.0

A gentle plant extract with antioxidant and soothing potential, though human skin research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Smooth Hydrangea Root Extract

Hydrangea Arborescens Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Smooth Sumac Extract

Rhus Glabra Bark/Berry/Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Anti-aging agent

Snail Oligopeptide-1

SNAIL OLIGOPEPTIDE-1

3.8

A lab-made peptide that mimics snail proteins, showing early promise for skin firmness and wrinkle reduction, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Humectant

Snail Secretion Ferment Filtrate

Saccharomyces/Snail Secretion Filtrate Ferment Filtrate

4.0

A fermented snail secretion ingredient that hydrates and may help smooth skin texture, but individual results vary and allergic reactions are possible.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Snail Secretion Filtrate

SNAIL SECRETION FILTRATE

4.0

Snail secretion filtrate is a hydrating, soothing ingredient that may help support skin barrier function and calm irritation, but it's not a miracle cure and can be expensive.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Humectant

Snake Gourd Stem Juice

TRICHOSANTHES KIRILOWII STEM JUICE

3.8

A gentle, hydrating plant juice that adds light moisture and soothing benefits to skincare, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Snow Lichen Extract

Flavocetraria Nivalis Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Snow Lotus Callus Extract

Saussurea Involucrata Callus Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Snowberry Fruit Extract

Symphoricarpos Albus Fruit 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

beautyskincareantioxidant
Read ingredient review

Antioxidant

Snowberry Leaf Extract

Symphoricarpos Albus Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Snowdrop Seed Extract

Galanthus Nivalis Seed Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Surfactant

Soapberry Ferment Extract

SAPINDUS MUKOROSSI FRUIT FERMENT EXTRACT

4.0

A gentle, plant-based ferment that cleanses without stripping and offers antioxidant benefits, but research is still emerging.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Soapberry Ferment Filtrate

Sapindus Emarginatus Fruit/Sucrose Ferment Filtrate

4.0

A gentle, naturally derived ferment that cleanses without stripping and may help calm the skin.

Irritation

low

Source

natural

beautyskincarecleansing
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Surfactant

Soapberry Fruit Extract

Sapindus Trifoliatus Fruit Extract

4.0

A gentle, plant-derived cleanser that effectively removes dirt and oil without stripping the skin, making it a great alternative to harsh sulfates.

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Emollient

Soapberry Fruit Oil

SAPINDUS MUKOROSSI FRUIT OIL

4.0

A gentle, plant-based oil that cleanses without stripping and softens skin, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
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Surfactant

Soapberry Fruit Powder

SAPINDUS MUKOROSSI FRUIT POWDER

4.0

A gentle, plant-based cleanser that creates a mild lather without stripping the skin, ideal for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarecleanser
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Cleansing Agent

Soapberry Leaf Extract

Sapindus Mukorossi Leaf Extract

3.8

A mild botanical extract that can help cleanse skin without stripping it, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarecleansing agent
Read ingredient review

Cleansing Agent

Soapberry Peel Extract

Sapindus Mukorossi Peel Extract

4.0

A gentle, plant-derived cleanser that offers a natural alternative to harsh synthetic surfactants, suitable for sensitive skin.

Irritation

low

Source

natural

beautyskincarecleansing
Read ingredient review

Surfactant

Soapberry Seed Extract

SAPINDUS MUKOROSSI SEED EXTRACT

4.0

A gentle, plant-derived cleanser that effectively removes dirt and oil without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Emollient

Soapberry Seed Oil

SAPINDUS MUKOROSSI SEED OIL

4.0

A gentle, plant-based oil that moisturizes and conditions skin without clogging pores, ideal for sensitive or oily skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Soothing Agent

Soapwort Callus Extract

SAPONARIA PUMILA CALLUS CULTURE EXTRACT

3.8

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

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Surfactant

Soapwort Extract

Saponaria Officinalis Leaf/Root Extract

4.0

A mild, plant-based cleanser that foams gently and is less stripping than many synthetic surfactants, making it a good option for sensitive skin.

Irritation

low

Source

natural

beautyskincarecleansing
Read ingredient review

Surfactant

Soapwort Leaf Extract

Saponaria Officinalis Leaf Extract

4.0

A mild, plant-based cleanser that creates gentle foam without stripping the skin, but may not be as effective as synthetic surfactants for heavy makeup or oil removal.

Irritation

low

Source

natural

beautyskincarecleansing
Read ingredient review

Surfactant

Soapwort Root Extract

Saponaria Officinalis Root Extract

4.0

A mild, plant-based cleanser that foams naturally and is generally well-tolerated, but may be drying for some skin types.

Irritation

low

Source

natural

beautyskincarecleansing agent
Read ingredient review

Surfactant

Soapwort Root Powder

Saponaria Officinalis Root Powder

4.0

A gentle, plant-based cleanser that creates a mild foam without harsh detergents, ideal for sensitive or dry skin.

Irritation

low

Source

natural

beautyskincarecleanser
Read ingredient review

Colorant

Sodalite Powder

Sodalite Powder

3.0

Sodalite powder adds a natural blue hue and a silky feel to cosmetics, but its skincare benefits are not well-studied.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

pH adjuster

Sodium

Sodium

3.0

Sodium itself is rarely used alone in skincare; it appears as part of salts like sodium chloride or sodium hyaluronate, where it helps with texture, preservation, or delivery.

Irritation

low

Source

natural

beautyskincaremineral
Read ingredient review

Skin conditioning agent

Sodium 5-Nitroguaiacolate

Sodium 5-Nitroguaiacolate

2.5

A synthetic skin-conditioning ingredient with limited research and potential for irritation; best avoided by sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareconditioning agent
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Buffering Agent

Sodium Acetate

Sodium Acetate

4.0

Sodium acetate is a gentle pH adjuster and mild humectant that helps keep your skincare stable and comfortable, but it offers no dramatic skin benefits on its own.

Irritation

low

Source

synthetic

beautyskincarebuffering agent
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Antioxidant

Sodium Acetyl Cysteinate

SODIUM ACETYL CYSTEINATE

3.8

A gentle antioxidant that may help protect skin from environmental stress and support collagen, but human studies are limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Thickener

Sodium Acrylate Copolymer

SODIUM ACRYLATE/SODIUM ACRYLOYLDIMETHYL TAURATE COPOLYMER

4.0

A safe, synthetic thickener that gives skincare products a silky, lightweight feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincaretexturizer
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Thickener

Sodium Acrylate Crosspolymer

SODIUM ACRYLATE/ACRYLOYLDIMETHYLTAURATE/DIMETHYLACRYLAMIDE CROSSPOLYMER

4.0

A safe, synthetic thickener that gives gels and creams a smooth, non-sticky feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincarethickener
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Thickener

Sodium Acrylates Copolymer

SODIUM ACRYLATES/VINYL ISODECANOATE CROSSPOLYMER

4.0

A safe, synthetic thickener that gives gels and creams a smooth, non-sticky feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincaretexturizer
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Thickener

Sodium Acrylates Crosspolymer

SODIUM ACRYLATES/C10-30 ALKYL ACRYLATE CROSSPOLYMER

4.0

A safe, widely used synthetic thickener that gives products a silky, non-greasy feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Thickener

Sodium Acrylates Crosspolymer-2

SODIUM ACRYLATES CROSSPOLYMER-2

4.0

A reliable synthetic thickener that gives skincare products a silky, non-sticky feel without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincaretexturizer
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Viscosity Controlling

Sodium Algin Sulfate

SODIUM ALGIN SULFATE

3.8

A gentle seaweed-derived thickener that helps create a smooth, spreadable texture, but research on its unique benefits is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareviscosity controlling
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Humectant

Sodium Allantoin PCA

SODIUM ALLANTOIN PCA

4.0

A gentle, dual-action ingredient that hydrates and soothes skin, making it a good choice for sensitive or irritated skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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pH Adjuster

Sodium Aluminate

Sodium Aluminate

2.5

Sodium aluminate is a synthetic pH adjuster that can be irritating at high concentrations, but is generally safe in trace amounts in rinse-off products.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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Buffering Agent

Sodium Aluminum Hydroxide Oxalate Sulfate

SODIUM/ALUMINUM HYDROXIDE/OXALATE/SULFATE

2.5

This mineral salt helps control product pH but has very limited research on its long-term skin effects, so it's best used in small amounts.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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