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

Exfoliant

Sea Salt

MARIS SAL (SEA SALT)

3.8

Sea salt can be a gentle physical exfoliant and mineral source, but it may be drying or irritating for sensitive or dehydrated skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Humectant

Sea Salt Ferment

SACCHAROMYCES/SEA SALT FERMENT

4.0

A gentle fermented ingredient that helps hydrate and strengthen the skin barrier, ideal for sensitive and dry skin types.

Irritation

low

Source

biotech

beautyskincarehumectant
Read ingredient review

Soothing Agent

Sea Salt Ferment Extract

Pichia/Sea Salt Ferment Lysate Extract

4.0

A gentle, fermented ingredient that may help calm and condition skin, but research is still early.

Irritation

low

Source

biotech

beautyskincaresoothing agent
Read ingredient review

Exfoliant

Sea Silt

Sea Silt

3.8

Sea silt is a gentle, mineral-rich exfoliant that can help polish skin and absorb excess oil without harshness.

Irritation

low

Source

natural

beautyskincareexfoliantmineral
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Soothing Agent

Sea Silt Extract

Maris Limus Extract

4.0

A gentle, mineral-packed marine extract that helps calm and nourish the skin without clogging pores.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Humectant

Sea Silt Ferment

SACCHAROMYCES/SEA SILT FERMENT

4.0

A gentle fermented ingredient that may help hydrate and support the skin barrier, but research is still limited.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
Read ingredient review

Antioxidant

Sea Thrift Extract

ARMERIA MARITIMA FLOWER/LEAF/STEM EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Sea Water

SEA WATER

3.8

Sea water provides a mineral-rich boost of hydration and can help soothe the skin, but it's not a miracle ingredient and may not suit very dry or sensitive skin types.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Soothing agent

Sea Whip Extract

Pseudopterogorgia elisabethae extract

3.8

A gentle marine extract that may help calm irritated skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Sea Wormwood Oil

Artemisia Maritima Herb Oil

3.5

Sea Wormwood Oil offers soothing and antimicrobial benefits but can be irritating for sensitive skin due to its essential oil content.

Irritation

moderate

Source

natural

beautyskincaresoothing
Read ingredient review

Soothing Agent

Sea Wrack Extract

ZOSTERA MARINA EXTRACT

4.0

A gentle marine extract that helps calm irritation and protect skin from environmental stress, ideal for sensitive or reactive skin types.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Conditioning agent

Seahorse Extract

Hippocampus spp. Extract

2.5

Seahorse extract is a traditional marine ingredient with limited modern research for cosmetic use; its benefits are largely anecdotal and sustainability concerns are significant.

Irritation

low

Source

natural

beautyskincaremarine extract
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Emollient

Seal Oil

Phoca vitulina oil

3.5

Seal oil is a moisturizing marine oil with omega-3s, but its use raises ethical and sustainability concerns, and it may clog pores for some.

Irritation

low

Source

natural

beautyskincareemollient
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Soothing Agent

Seaweed Callus Extract

ZOSTERA MARINA CALLUS EXTRACT

4.0

A gentle, lab-grown seaweed extract that may help calm irritation and defend against environmental stress, though human research is still limited.

Irritation

low

Source

biotech

beautyskincaresoothing agent
Read ingredient review

Humectant

Seaweed Complex Extract

Eucheuma Serra/Saccharina Angustata/Ulva Linza Extract

4.0

A gentle seaweed blend that helps hydrate and calm the skin, suitable for most skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Seaweed Extract

Undaria Pinnatifida Leaf/Stem Extract

4.0

A gentle, hydrating seaweed extract that helps soothe and protect the skin, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Humectant

Seaweed Extract Blend

ASCOPHYLLUM NODOSUM/FUCUS VESICULOSUS/LAMINARIA CLOUSTONI/LAMINARIA DIGITATA EXTRACT

4.0

A gentle, nutrient-packed seaweed blend that hydrates and soothes skin with antioxidant benefits.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Humectant

Seaweed Extract Complex

ASCOPHYLLUM NODOSUM/FUCUS VESICULOSUS/HIZIKIA FUSIFORME/KJELLMANIELLA GYRATA/LESSONIA NIGRESCENS/SACCHARINA ANGUSTATA/SACCHARINA JAPONICA/UNDARIA PINNATIFIDA EXTRACT

4.0

A nourishing seaweed blend that hydrates, soothes, and protects skin with antioxidants, but its complex sourcing may vary in potency.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Seaweed Ferment Complex

Saccharina angustata/Undaria pinnatifida extract

4.0

A gentle seaweed blend that hydrates and provides antioxidant protection, ideal for most skin types.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Seaweed Thallus Extract

Chondrus Elatus/Saccharina Angustata/Monostroma Nitidum Thallus Extract

4.0

A gentle seaweed blend that helps hydrate and calm the skin, but research on this specific mix is limited.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Humectant

Seaweed Yeast Ferment

SACCHAROMYCES/LAMINARIA SACCHARINA FERMENT

4.0

A fermented seaweed-yeast complex that helps hydrate and soothe skin while supporting a healthy barrier.

Irritation

low

Source

biotech

beautyskincarehumectantsoothing
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pH Adjuster

Sebacic Acid

Sebacic Acid

4.0

Sebacic acid is a gentle, plant-derived ingredient that helps balance product pH and offers mild exfoliation without significant irritation.

Irritation

low

Source

natural

beautyskincarepH adjuster
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Solvent

Sec-Butyl Alcohol

SEC-BUTYL ALCOHOL

3.5

Sec-Butyl Alcohol is a synthetic solvent that helps other ingredients mix, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Film Former

Sec-Butyl Methacrylate

SEC-BUTYL METHACRYLATE

3.0

A synthetic film-forming monomer found mainly in nail products; it helps create a durable, glossy coating but can be a skin sensitizer for some people.

Irritation

moderate

Source

synthetic

beautyskincarenail-care
Read ingredient review

Skin Conditioning Agent

Sec-Butylphenyl Ethyl Glyceryl Diether

SEC-BUTYLPHENYL ETHYL GLYCERYL DIETHER

3.5

A synthetic skin-conditioning ingredient that improves product feel and spreadability, with limited but promising safety data.

Irritation

low

Source

synthetic

beautyskincaretexturizer
Read ingredient review

Skin Conditioning Agent

Sec-Butylphenyl Glyceryl Ether

SEC-BUTYLPHENYL GLYCERYL ETHER

4.0

A synthetic skin conditioner that helps products feel smooth and non-greasy, with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareskin conditioning
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Humectant

Sechium Edule Fruit Juice

SECHIUM EDULE FRUIT JUICE

3.8

A gentle, water-rich fruit juice that adds light hydration and antioxidant support, but lacks strong clinical evidence for dramatic skin benefits.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Soothing Agent

Sedum Acre Extract

Sedum Acre Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical
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Soothing agent

Sedum Bulbiferum Extract

Sedum Bulbiferum Extract

3.8

A gentle, plant-derived extract with soothing and antioxidant potential, but research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Sedum Dendroideum Extract

Sedum Dendroideum Leaf/Stem Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Sedum Ferment Filtrate

LACTOBACILLUS/SEDUM KAMTSCHATICUM LEAF/STEM FERMENT FILTRATE

3.8

A gentle fermented plant extract with antioxidant potential, but human studies are limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Sedum Purpureum Extract

Sedum Purpureum Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Sedum Takesimense Extract

Sedum Takesimense Leaf/Stem Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Seed Oils

Seed Oils (various)

4.0

Seed oils are versatile moisturizers that help soften and protect the skin, but their comedogenic potential varies widely by type.

Irritation

low

Source

natural

beautyskincareemollient
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Surfactant

Sekken Soji

Sekken Soji

3.8

A gentle, plant-derived cleanser that creates a mild foam and helps remove dirt without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarecleanser
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Antifungal

Selenium Sulfide

SELENIUM SULFIDE

4.0

Selenium sulfide is a well-studied antifungal ingredient that effectively controls dandruff and scalp flaking, but it can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarescalp care
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Antioxidant

Semiaquilegia Root Extract

Semiaquilegia Adoxoides Root Extract

3.8

A gentle botanical extract with antioxidant potential, but research is limited and benefits are not yet well-established in modern skincare.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing Agent

Senecio Cannabifolius Extract

SENECIO CANNABIFOLIUS EXTRACT

3.5

A lesser-known botanical extract that may offer soothing and antioxidant benefits, but research is very limited and safety data is sparse.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Senna Leaf Extract

Senna Garrettiana Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Absorbent

Sepiolite

Sepiolite

4.0

A gentle, natural clay that helps control oil and improve product texture without drying out the skin.

Irritation

low

Source

natural

beautyskincareabsorbent
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Absorbent

Sepiolite Extract

Sepiolite

3.8

A gentle clay mineral that helps absorb excess oil and improve product texture without stripping the skin.

Irritation

low

Source

natural

beautyskincaretexturizer
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Antioxidant

Sequoia Stem Extract

SEQUOIA SEMPERVIRENS STEM EXTRACT

3.8

A gentle, antioxidant-rich botanical extract that may help protect skin from environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Film-Forming Agent

Serica

Serica

4.0

Serica is a silk-derived ingredient that gives skin a silky, smooth feel and helps lock in moisture, but it may not suit those with silk allergies.

Irritation

low

Source

natural

beautyskincarefilm-forming agent
Read ingredient review

Humectant

Serica Extract

Serica Extract

3.8

Serica Extract is a gentle, silk-based humectant that helps skin feel soft and hydrated without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectant
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Absorbent

Serica Powder

Serica Powder

4.0

Serica Powder is a natural silk-derived ingredient that gives makeup a silky feel and helps absorb excess oil without clogging pores.

Irritation

low

Source

natural

beautyskincarecosmetic
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Humectant

Sericin

Sericin

4.0

Sericin is a gentle silk protein that helps skin hold onto moisture and feel smooth, but it's not a miracle anti-aging ingredient.

Irritation

low

Source

natural

beautyskincarehumectantfilm-forming
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Soothing Agent

Sericoside

Sericoside

3.8

Sericoside is a gentle plant extract that may help calm skin and support a youthful appearance, but research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Humectant

Serine

SERINE

4.2

Serine is a gentle, water-binding amino acid that helps keep skin plump and supports a healthy barrier without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Exfoliant

Serralysin

Serratia Peptidase

3.8

A gentle enzyme exfoliant that breaks down dead skin proteins without harsh scrubbing, but research in topical skincare is still limited.

Irritation

low

Source

biotech

beautyskincareexfoliant
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Film Former

Serum Albumin

SERUM ALBUMIN

3.5

Serum albumin is a protein that can temporarily smooth and firm the skin, but its benefits are mostly surface-level and not well-supported by modern research.

Irritation

low

Source

natural

beautyskincarefilm-former
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Antioxidant

Service Tree Fruit Extract

SORBUS TORMINALIS FRUIT EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Serviceberry Fruit Extract

Amelanchier canadensis 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
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Antioxidant

Sesame Meristem Cell Extract

Sesamum Indicum Meristem Cell Culture Extract

3.8

A gentle, lab-grown plant cell extract that may help protect skin from environmental stress, though human studies are limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Emollient

Sesame Oil Glycereth-8 Esters

SESAME OIL GLYCERETH-8 ESTERS

4.0

A gentle, semi-synthetic emollient that softens skin and improves product texture without heavy greasiness.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Emulsifier

Sesame Oil Polyglyceryl-6 Esters

Sesamum Indicum (Sesame) Seed Oil Polyglyceryl-6 Esters

4.0

A mild, plant-based emulsifier that helps blend oil and water in creams and lotions while adding a light, non-greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Sesame Seed Butter

Sesamum Indicum Seed Butter

4.0

Sesame seed butter is a gentle, natural emollient that softens and conditions skin without clogging pores, making it a good choice for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Sesame Seed Oil PEG-8 Esters

SESAME SEED OIL PEG-8 ESTERS

3.8

A gentle, water-friendly emollient that helps cleanse without stripping the skin, but its PEG modification raises mild environmental and purity considerations.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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