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

Anti-aging agent

SH-Tetrapeptide-39

SH-Tetrapeptide-39

3.8

A lab-made peptide that may help firm skin and soften fine lines, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

SH-Tetrapeptide-39 Acetate

SH-Tetrapeptide-39 Acetate

4.0

A lab-made peptide that may help firm skin by signaling collagen production, but human studies are limited.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Antioxidant

Shaggy Mane Mushroom Powder

COPRINUS COMATUS POWDER

3.8

A gentle, antioxidant-rich mushroom powder that may help calm skin and fight free radicals, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Shark Liver Oil

SQUALENE (from shark liver oil)

3.5

Shark liver oil is a rich source of squalene, a natural emollient that hydrates and protects skin, but ethical and sustainability concerns have led many brands to switch to plant-based alternatives.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

She-Oak Branch/Leaf Extract

CASUARINA STRICTA BRANCH/LEAF 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
Read ingredient review

Emollient

Shea Butter

Butyrospermum Parkii (Shea) Butter

4.5

A deeply nourishing, non-irritating butter that softens and protects the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Shea Butter Cetyl Esters

Shea Butter Cetyl Esters

4.0

A gentle, non-greasy emollient that helps soften skin and improve the feel of creams and balms.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Shea Butter Decyl Esters

Shea Butter Decyl Esters

4.3

A lightweight, non-greasy emollient that delivers shea butter's moisturizing benefits without the heavy feel, suitable for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Shea Butter Ethyl Esters

Shea Butter Ethyl Esters

4.3

A silky, non-greasy emollient derived from shea butter that moisturizes without the heavy feel of traditional shea butter.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Shea Butter Extract

Butyrospermum Parkii Butter Extract

4.3

A nourishing extract from shea butter that hydrates and softens skin without feeling overly greasy.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Shea Butter Glyceride

Shea Butter Glyceride

4.3

A gentle, non-greasy emollient derived from shea butter that softens skin and helps maintain moisture without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Shea Butter Oleyl Esters

Shea Butter Oleyl Esters

4.3

A gentle, non-greasy emollient that improves skin softness without clogging pores, ideal for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emulsifier

Shea Butter PEG-32 Esters

SHEA BUTTER PEG-32 ESTERS

4.0

A gentle, water-friendly derivative of shea butter that helps blend oil and water in formulas without the greasiness of plain shea butter.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

Shea Butter PEG-8 Esters

Shea Butter PEG-8 Esters

4.0

A water-friendly version of shea butter that hydrates and helps blend oils and water in your products, with a lighter feel than traditional shea butter.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
Read ingredient review

Emulsifier

Shea Butter Polyglyceryl-6 Esters

Shea Butter Polyglyceryl-6 Esters

4.5

A mild, eco-friendly emulsifier that helps blend oil and water in creams and lotions while leaving skin feeling soft.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emollient

Shea Butter Unsaponifiables

Butyrospermum Parkii (Shea) Butter Unsaponifiables

4.3

A powerhouse fraction of shea butter that soothes, repairs, and strengthens the skin barrier without the heavy, greasy feel of whole shea butter.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review