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

Film Former

Hydrolyzed Bladderwrack Protein

Hydrolyzed Fucus Vesiculosus Protein

4.0

A gentle, protein-rich seaweed derivative that helps hydrate and form a protective film on the skin, but evidence is mostly based on whole seaweed extracts rather than this specific hydrolyzed protein.

Irritation

low

Source

natural

beautyskincarefilm-former
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Humectant

Hydrolyzed Bottle Gourd Juice

Hydrolyzed Lagenaria Siceraria Fruit Juice

3.8

A gentle, water-soluble extract from bottle gourd that helps hydrate and calm the skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Hair Conditioning Agent

Hydrolyzed Brazil Nut Protein

Hydrolyzed Brazil Nut Protein

4.0

A gentle, plant-based protein that can temporarily strengthen hair and lightly moisturize skin without irritation.

Irritation

low

Source

natural

beautyskincarehaircareconditioning agent
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Antioxidant

Hydrolyzed Cacao Seed Meal

Hydrolyzed Theobroma Cacao Seed Meal

4.0

A gentle, antioxidant-rich ingredient from cacao seeds that helps hydrate and protect the skin, though research on its topical benefits is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Hydrolyzed Calcium Hyaluronate

Hydrolyzed Calcium Hyaluronate

4.3

A smaller, salt-linked version of hyaluronic acid that may hydrate deeper layers of skin with lower irritation potential.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Soothing Agent

Hydrolyzed Calendula Extract

HYDROLYZED CALENDULA OFFICINALIS FLOWER EXTRACT

4.0

A gentle, hydrolyzed version of calendula extract that soothes irritation and supports skin barrier function with low risk of irritation.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Film Former

Hydrolyzed Calf Skin

HYDROLYZED CALF SKIN

3.5

Hydrolyzed calf skin is a protein ingredient that can temporarily plump and smooth skin, but its animal origin and limited evidence for long-term benefits may not suit everyone.

Irritation

low

Source

natural

beautyskincarefilm-former
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Skin conditioning

Hydrolyzed Calf Tissue Complex

HYDROLYZED CALF LIGAMENTS/LIVER/SKIN

2.5

An animal-derived protein ingredient that may temporarily smooth skin, but lacks strong evidence and raises ethical and sourcing concerns.

Irritation

low

Source

natural

beautyskincareconditioning agent
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Humectant

Hydrolyzed Candida Bombicola Extract

Hydrolyzed Candida Bombicola Extract

4.0

A gentle, biotech-derived yeast extract that helps hydrate and soothe the skin, making it a good option for sensitive or dry skin types.

Irritation

low

Source

biotech

beautyskincarehumectant
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Film Former

Hydrolyzed Carnauba Wax

Hydrolyzed Carnauba Wax

3.8

A gentle, plant-derived film-former that helps lock in moisture and smooth the skin's surface without clogging pores.

Irritation

low

Source

natural

beautyskincarefilm-former
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Humectant

Hydrolyzed Carob Gum Extract

Hydrolyzed Ceratonia Siliqua Gum Extract

4.0

A gentle, plant-derived humectant that helps hydrate and soothe the skin while supporting a healthy microbiome.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Hydrolyzed Carob Seed Extract

Hydrolyzed Ceratonia Siliqua Seed Extract

4.0

A gentle, plant-derived humectant that helps attract moisture to the skin without common irritation or clogging concerns.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Hydrolyzed Carrot Extract

Hydrolyzed Carrot Extract

4.0

A gentle antioxidant-rich extract that may help protect skin from environmental stress and support a healthy-looking complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Hydrolyzed Cassava Root Extract

Hydrolyzed Manihot Esculenta Tuber Extract

3.8

A gentle, plant-derived humectant that helps attract moisture to the skin, with emerging research suggesting antioxidant and soothing benefits.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Hydrolyzed Cassia Bark Extract

Hydrolyzed Cinnamomum Cassia Bark Extract

3.8

A gentle antioxidant extract from cassia bark that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Hydrolyzed Cattail Pollen & Root Extract

Hydrolyzed Typha Angustifolia Pollen/Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Hydrolyzed Caviar Extract

Hydrolyzed Caviar Extract

3.8

Hydrolyzed caviar extract is a luxury humectant that provides surface moisture and amino acids, but its anti-aging benefits are not strongly supported by independent research.

Irritation

low

Source

natural

beautyskincarehumectantskin-conditioning agent
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Antioxidant

Hydrolyzed Cherimoya Fruit Extract

Hydrolyzed Annona Cherimola Fruit Extract

3.8

A gentle, antioxidant-rich fruit extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Hydrolyzed Chestnut Extract

Hydrolyzed Chestnut Extract

4.0

A mild, antioxidant-rich extract that helps calm skin and defend against environmental stress—great for sensitive or reactive skin types.

Irritation

low

Source

natural

beautyskincareantioxidant
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Film Former

Hydrolyzed Chitosan Ferulyl Linoleate

Hydrolyzed Chitosan Ferulyl Linoleate

4.0

A gentle, multifunctional ingredient that combines antioxidant protection with a light film-forming effect, suitable for most skin types.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Hydrolyzed Citrus Peel Extract

Hydrolyzed Citrus Sphaerocarpa Peel Extract

4.0

A gentle, antioxidant-rich citrus extract that may help brighten skin and protect against environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Hydrolyzed Cladosiphon Extract

Hydrolyzed Cladosiphon Novae-Caledoniae Extract

4.0

A gentle, hydrating seaweed extract that helps skin retain moisture and may calm irritation, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Hydrolyzed Cockscomb

Hydrolyzed Cockscomb

4.0

A gentle, plant-based humectant that helps skin hold onto moisture and may support a smoother appearance.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Hydrolyzed Cockscomb Extract

HYDROLYZED COCKSCOMB EXTRACT

4.0

A gentle, plant-based humectant that helps hydrate and plump the skin, similar to hyaluronic acid but from a botanical source.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Emollient

Hydrolyzed Cocoa Butter

Hydrolyzed Theobroma Cacao Seed Butter

4.0

A lighter, water-friendly version of cocoa butter that hydrates and softens skin without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Antioxidant

Hydrolyzed Cocoa Fruit

Hydrolyzed Cocoa Fruit

4.0

Hydrolyzed cocoa fruit is a gentle antioxidant-rich ingredient that helps hydrate and protect skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Hydrolyzed Collagen

Hydrolyzed Collagen

4.0

Hydrolyzed collagen is a well-tolerated humectant that draws moisture to the skin and forms a temporary film for a smoother feel, but it cannot replace lost collagen deep in the skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Film-Forming Agent

Hydrolyzed Conalbumin

Hydrolyzed Conalbumin

3.5

Hydrolyzed conalbumin is a gentle egg-derived protein that forms a light film on skin to help retain moisture and temporarily smooth fine lines.

Irritation

low

Source

natural

beautyskincarefilm-former
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Film Former

Hydrolyzed Conchiolin Protein

Hydroxypropyltrimonium Hydrolyzed Conchiolin Protein

4.0

A gentle, protein-rich ingredient from pearl shells that helps smooth hair and temporarily plump skin by forming a light film.

Irritation

low

Source

natural

beautyskincarehaircare
Read ingredient review

Soothing Agent

Hydrolyzed Coral

HYDROLYZED CORAL

3.5

Hydrolyzed coral is a mineral-rich ingredient that may help soothe and hydrate the skin, but scientific evidence is limited and sustainability concerns exist.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Humectant

Hydrolyzed Corallina Extract

Hydrolyzed Corallina Officinalis Extract

4.0

A gentle, hydrating seaweed extract that may help calm irritation and support the skin barrier.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Hydrolyzed Coriander Fruit Extract

Hydrolyzed Coriandrum Sativum Fruit Extract

3.8

A gentle, antioxidant-rich plant extract that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Surfactant

Hydrolyzed Corn Protein Surfactant

SODIUM/TEA-UNDECYLENOYL HYDROLYZED CORN PROTEIN

4.0

A gentle, protein-based surfactant that cleans without stripping, making it ideal for sensitive skin and hair.

Irritation

low

Source

semi-synthetic

beautyskincarehaircarecleansing agent
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Humectant

Hydrolyzed Cottonseed Protein

Hydrolyzed Cottonseed Protein

4.0

A gentle, plant-based protein that helps reinforce the skin barrier and improve moisture retention without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Hydrolyzed Cranberry Extract

Hydrolyzed Cranberry Fruit/Leaf Extract

3.8

A gentle antioxidant-rich extract that may help protect skin from environmental stress, but research on its topical benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Hydrolyzed Cucumber Fruit

Hydrolyzed Cucumber Fruit

4.0

A gentle, water-loving derivative of cucumber that helps hydrate and soothe the skin, ideal for sensitive and dry types.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Hydrolyzed Cupuaçu Fruit

HYDROLYZED THEOBROMA GRANDIFLORUM FRUIT

4.0

A gentle, antioxidant-rich humectant from cupuaçu fruit that helps hydrate and protect the skin without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Hydrolyzed Damask Rose Extract

Hydrolyzed Rosa Damascena Flower Extract

4.0

A gentle, antioxidant-rich rose extract that helps calm skin and fight free radical damage, suitable for most skin types.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Hydrolyzed Eel Head Extract

HYDROLYZED EEL HEAD EXTRACT

3.5

A novel marine-derived peptide ingredient that may support skin hydration and firmness, but research is very limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Film Former

Hydrolyzed Egg Protein

Hydrolyzed Egg Protein

4.0

Hydrolyzed egg protein is a gentle, natural ingredient that helps strengthen hair and temporarily smooth the skin's surface, but it is not a deep moisturizer or repair agent.

Irritation

low

Source

natural

beautyskincarehaircare
Read ingredient review