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

Surfactant

Shea Butteramide/Castoramide DEA

SHEA BUTTERAMIDE/CASTORAMIDE DEA

3.5

A gentle emulsifier and foam booster that helps blend oil and water in cleansers, but may cause mild irritation for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Shea Butteramidopropyl Betaine

Shea Butteramidopropyl Betaine

4.0

A gentle, shea-derived surfactant that cleanses without stripping, making it a good choice for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Antioxidant

Shea Leaf Extract

Butyrospermum Parkii Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Shea Nut Extract

Butyrospermum Parkii Nut Extract

4.0

A gentle, nourishing extract from shea nuts that helps soften and soothe the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Exfoliant

Shea Nut Shell Powder

Butyrospermum Parkii Nut Shell Powder

3.8

A gentle, natural exfoliating powder from shea nut shells, ideal for physical scrubs without harsh microplastics.

Irritation

low

Source

natural

beautyskincareexfoliant
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Emollient

Shea Oil

Butyrospermum Parkii Oil

4.3

Shea oil is a gentle, non-greasy moisturizer that softens skin and helps restore its natural barrier without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Shea Seedcake Extract

Butyrospermum Parkii Seedcake Extract

4.0

A gentle, antioxidant-rich extract from shea nut leftovers that helps soothe and protect skin without the heavy feel of shea butter.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin conditioning

Sheep Dermal Cell Lysate

SHEEP DERMAL CELLS LYSATE

3.5

A novel biotech ingredient that may support skin repair, but human evidence is still limited.

Irritation

low

Source

biotech

beautyskincareactive
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Emollient

Sheep Milk

SHEEP MILK

3.8

Sheep milk is a gentle, naturally moisturizing ingredient that can soothe and soften skin, but it's not a miracle cure and may not suit those with dairy allergies.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Sheep Polypore Mushroom Extract

Albatrellus Ovinus Extract

3.5

A mushroom extract with antioxidant potential, but research is limited and benefits are not well-established in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin conditioning agent

Sheep Skin Lysate

SHEEP SKIN LYSATE

3.5

A novel ingredient from sheep skin that may support skin repair, but research is very limited and it's not a proven must-have.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Antioxidant

Sheep Sorrel Extract

Rumex Acetosella Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Shell Ginger Extract

Alpinia Speciosa Flower/Leaf/Seed/Stem Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Shell Ginger Flower Water

Alpinia Speciosa Flower Water

3.8

A gentle, aromatic floral water that offers mild soothing and antioxidant benefits, but research on its specific skincare effects is still limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Film Former

Shellac

SHELLAC

3.5

Shellac is a natural resin that creates a hard, glossy film in nail polishes and some hair and lip products, but it's not a common skincare ingredient.

Irritation

low

Source

natural

beautyskincarenail care
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Soothing Agent

Shepherd's Purse Sprout Water

Capsella Bursa-Pastoris Sprout Water

3.8

A gentle, plant-derived water that may help calm irritation and provide antioxidant protection, but research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Shiikuwasa Fruit Water

Citrus Depressa Fruit Water

3.8

A gentle, antioxidant-rich fruit water that can help refresh and protect the skin, but its benefits are less concentrated than a pure extract.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing agent

Shiitake & Licorice Ferment Filtrate

LENTINUS EDODES/LICORICE ROOT EXTRACT FERMENT FILTRATE

4.0

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

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Shiitake Mushroom Extract

Corthellus Shiitake Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Shiitake Mycelium Extract

LENTINUS EDODES MYCELIUM EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Shiitake Mycelium Ferment Extract

LENTINUS EDODES MYCELIUM FERMENT FILTRATE EXTRACT

4.0

A gentle, antioxidant-rich mushroom ferment that may help calm skin and defend against environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin-conditioning agent

Shikimate Retinyl Ester

Retinyl Hydroxypentanoatyl Shikimate

4.0

A next-generation retinoid designed to deliver anti-aging benefits with less irritation than traditional retinol.

Irritation

low

Source

semi-synthetic

beautyskincareactive
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Exfoliant

Shikimic Acid

SHIKIMIC ACID

4.0

A gentle, plant-based AHA that exfoliates and provides antioxidant benefits, suitable for most skin types including sensitive skin.

Irritation

low

Source

natural

beautyskincareexfoliant
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Anti-aging agent

Shikimoyl Hexapeptide-48

Shikimoyl Hexapeptide-48

4.0

A lab-made peptide that aims to mimic the skin-firming effects of shikimic acid, but clinical data is still limited.

Irritation

low

Source

semi-synthetic

beautyskincarepeptide
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Soothing Agent

Shikimoyl Nonapeptide-11

Shikimoyl Nonapeptide-11

3.8

A synthetic peptide that aims to calm skin reactivity and reduce the look of redness, but clinical evidence is still limited.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
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Anti-aging agent

Shikimoyl SH-Nonapeptide-12

SH-Nonapeptide-12

4.0

A lab-made peptide that may help smooth wrinkles and improve skin firmness, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Antioxidant

Shinanoki Ekisu

Shinanoki Ekisu

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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UV absorber

Shinorine

SHINORINE

4.0

Shinorine is a natural, algae-derived UV filter and antioxidant that helps protect skin from sun damage without the irritation of some synthetic filters.

Irritation

low

Source

natural

beautyskincareantioxidantUV filter
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Humectant

Shirakaba Birch Sap

Betula Alba Juice

4.0

A gentle, hydrating birch sap that helps soothe and moisturize skin with natural minerals and antioxidants.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Shirakaba Ekisu

Betula Alba Juice

4.0

A gentle, hydrating sap from birch trees that may help soothe and lightly moisturize the skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Shonan Gold Citrus Fruit Water

Citrus Shonan-Gold Fruit Water

3.8

A gentle, antioxidant-rich fruit water that adds a touch of freshness and protection to skincare formulas, but research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Shorea Robusta Leaf Extract

Shorea Robusta Leaf Extract

3.8

A gentle, plant-derived antioxidant 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

Shunkokan Fruit Extract

Citrus Shunkokan Fruit Extract

3.8

A gentle, antioxidant-rich citrus extract that may help brighten and soothe skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Shunkokan Peel Extract

Citrus Shunkokan Peel Extract

3.8

A gentle citrus peel extract that may help protect skin from environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Sialyllactose

Sialyllactose

4.0

Sialyllactose is a gentle, milk-derived sugar that helps hydrate skin and support a healthy microbiome, but research on its cosmetic benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantprebiotic
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Soothing Agent

Siberian Catmint Extract

Nepeta Sibirica Flower/Leaf/Stem Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Siberian Chrysanthemum Extract

Chrysanthemum Sibiricum Extract

3.8

A gentle, antioxidant-rich plant extract 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

Siberian Cocklebur Fruit Extract

XANTHIUM SIBIRICUM FRUIT 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

beautyskincareantioxidant
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Antioxidant

Siberian Columbine Extract

AQUILEGIA SIBIRICA FLOWER/LEAF/STEM EXTRACT

3.5

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Siberian Corispermum Extract

Corispermum Sibiricum Flower/Leaf/Stem Extract

3.5

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Siberian Crab Apple Extract

Malus Baccata Fruit/Leaf/Stem Extract

4.0

A gentle, antioxidant-rich botanical extract that helps protect skin from environmental stress and supports a healthy-looking complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Siberian Fern Extract

Diplazium Sibiricum Leaf/Stem Extract

3.8

A gentle, antioxidant-rich fern extract that may help calm stressed skin, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Siberian Fir Needle Extract

Abies Sibirica Needle 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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Fragrance

Siberian Fir Needle Oil

Abies Sibirica Needle Oil

3.8

Siberian Fir Needle Oil adds a fresh, woodsy scent to products but can be irritating for sensitive skin, especially at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Fragrance

Siberian Fir Oil

Abies Sibirica Oil

3.8

Siberian Fir Oil adds a fresh, pine-like scent to products but can be irritating for sensitive skin, especially at high concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Siberian Ginseng Callus Extract

Acanthopanax Senticosus Callus Culture Extract

4.0

A gentle, antioxidant-rich plant extract from Siberian ginseng that may help calm skin and defend against environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Siberian Ginseng Root Extract

Acanthopanax Senticosus Root Extract

4.0

A gentle antioxidant-rich root extract that may help calm skin and defend against environmental stress.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Siberian Ginseng Root Water

Acanthopanax Senticosus Root Water

4.0

A gentle, antioxidant-rich root water that helps soothe and protect skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Siberian Ginseng Stem Extract

Acanthopanax Senticosus Stem Extract

4.0

A gentle botanical extract from Siberian ginseng stems that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Siberian Hawkweed Extract

Crepis Sibirica Flower/Leaf/Stem 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

beautyskincareantioxidant
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