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 1,094
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

Humectant

Combretum Flower Nectar

Combretum Farinosum Flower Nectar

3.8

A gentle, natural humectant from flower nectar that helps attract moisture to the skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Costa Rican Dragon Fruit Juice

HYLOCEREUS COSTARICENSIS FRUIT JUICE

3.8

A gentle, water-like fruit juice that adds hydration and a touch of antioxidants to skincare formulas, but its benefits are mild compared to more concentrated actives.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Cotton Fruit Water

Gossypium Herbaceum Fruit Water

3.8

Cotton Fruit Water is a mild, hydrating botanical water that soothes and refreshes skin, but its benefits are largely anecdotal and not backed by strong clinical research.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Creatine

Creatine

4.0

Creatine is a gentle, naturally sourced ingredient that helps skin cells produce energy, potentially improving firmness and reducing fine lines with consistent use.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Crimson Glory Vine Sap

Vitis Coignetiae Sap

4.0

A gentle, hydrating sap from a wild grape species that offers antioxidant benefits and soothing properties, but research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Crisp Wrack Extract

Fucus Crispus Thalle Extract

4.0

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

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Cryptomeria Japonica Stem Water

Cryptomeria Japonica Stem Water

3.8

A gentle, plant-based water that adds light hydration and antioxidant protection, best for sensitive or environmentally stressed skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Cupuacu Fruit Juice

THEOBROMA GRANDIFLORUM FRUIT JUICE

4.0

A gentle, hydrating fruit juice rich in antioxidants that helps soothe and moisturize the skin without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Humectant

Cyclo PEG-6

CYCLO PEG-6

3.5

A gentle synthetic humectant that helps hydrate skin and improve product texture, but offers no unique benefits over more common alternatives.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Cyclohexylglycerin

Cyclohexylglycerin

4.0

A gentle, synthetic humectant that hydrates skin and helps preserve formulas, making it a popular alternative to parabens.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Cyclotetraglucose

CYCLOTETRAGLUCOSE

4.0

A gentle, sugar-based humectant that hydrates and soothes without irritation, ideal for sensitive or reactive skin.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Cymbidium Orchid Flower/Stem Water

CYMBIDIUM GREAT FLOWER FLOWER/STEM WATER

3.5

A gentle, aromatic orchid water that adds light hydration and a touch of elegance to skincare, but with limited scientific backing for unique benefits beyond plain water.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Damson Plum Juice

Prunus Insititia Juice

3.8

Damson Plum Juice is a gentle, fruit-derived humectant that adds light hydration and a touch of natural antioxidant activity to skincare formulas.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Date Fruit Ferment Filtrate

LACTOBACILLUS/PHOENIX DACTYLIFERA FRUIT FERMENT FILTRATE

4.0

A gentle, probiotic-derived ingredient that may help hydrate and support the skin barrier, though research is still emerging.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Date Fruit Juice

Phoenix Dactylifera Fruit Juice

4.0

A gentle, sugar-rich fruit juice that helps hydrate and protect the skin with natural antioxidants, but offers limited benefits compared to more concentrated actives.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Day Lily & Honey Ferment

SACCHAROMYCES/DAY LILY FLOWER/HONEY FERMENT FILTRATE

4.0

A gentle, fermented ingredient that may help hydrate and calm the skin, but research is still emerging.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Decylene Glycol

DECYLENE GLYCOL

4.0

Decylene Glycol is a gentle, multi-tasking ingredient that hydrates, softens skin, and helps preserve formulas without harsh preservatives.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Deer Milk Extract

Deer Milk Extract

3.5

Deer milk extract is a gentle, moisturizing ingredient with some soothing potential, but scientific evidence is limited and it may not be suitable for vegans.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Deoxyglutamyl Fructose

Deoxyglutamyl Fructose

4.0

A gentle, sugar-based humectant that attracts moisture to the skin and may help reduce the look of fine lines without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Desert Algae Extract

Scenedesmus deserticola extract

4.0

A gentle, hydrating algae extract that helps skin retain moisture and defends against environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Humectant

Diacetin

DIACETIN

4.0

Diacetin is a gentle humectant that helps keep skin hydrated and can improve the feel of skincare products.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Dibutylene Tetrafurfural

Dibutylene Tetrafurfural

3.5

A synthetic humectant that helps hydrate skin, but research on its long-term benefits is still emerging.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Diethyl Glutamate

Diethyl Glutamate

4.0

A gentle, water-binding amino acid derivative that helps keep skin hydrated and smooth without irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emollient

Diglycereth-7 Malate

DIGLYCERETH-7 MALATE

4.0

A lightweight, water-loving emollient that hydrates and softens skin without clogging pores or feeling heavy.

Irritation

low

Source

semi-synthetic

beautyskincareemollienthumectant
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Humectant

Diglycerin

DIGLYCERIN

4.3

Diglycerin is a gentle, effective humectant that hydrates skin without the sticky feel of glycerin, making it a great option for lightweight moisturizers.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Dihydroxypropyl Arginine HCl

DIHYDROXYPROPYL ARGININE HCL

4.0

A gentle, water-loving amino acid derivative that helps attract moisture to the skin and may support a healthier barrier.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Dimethyl Aspartic Acid

Dimethyl Aspartic Acid

3.8

A gentle, lab-made amino acid derivative that may help skin retain moisture and feel smoother, though research is still early.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Skin Conditioning

Dimethyl Glutamic Acid

Dimethyl Glutamic Acid

4.0

A gentle, water-attracting ingredient that helps keep skin hydrated and smooth without irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Dimethyl Octene Diol

DIMETHYL-7-OCTENE-1,6-DIOL

3.8

A gentle, synthetic humectant that helps hydrate skin without the stickiness of glycerin, but research on its long-term benefits is still limited.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Dimethylolcyclohexane

DIMETHYLOLCYCLOHEXANE

3.5

A synthetic humectant that helps hydrate skin and improve product feel, generally well-tolerated but less studied than glycerin.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Dimethylsilanol Hyaluronate

Dimethylsilanol Hyaluronate

4.0

A hybrid of hyaluronic acid and silicon that aims to hydrate and support skin firmness, though research is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Dipotassium Aspartate

Dipotassium Aspartate

4.0

Dipotassium Aspartate is a gentle, water-attracting amino acid salt that helps keep skin hydrated and supports a healthy moisture barrier without irritation.

Irritation

low

Source

synthetic

beautyskincarehumectantamino acid
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Humectant

Disodium Glucose Phosphate

Disodium Glucose Phosphate

4.2

Disodium Glucose Phosphate is a mild, sugar-derived humectant that boosts skin hydration without common irritation or stickiness.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Disodium Inosinate

Disodium Inosinate

3.5

Disodium Inosinate is a gentle humectant that may help support skin hydration and barrier function, but research is still early.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

DNA

DNA

3.8

DNA is a gentle humectant and film former that helps hydrate and temporarily plump skin, but its anti-aging claims are not strongly backed by independent human studies.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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Humectant

Dogfish Skin Extract

SCYLLII PELLIS EXTRACT

3.5

A marine extract that may help hydrate and condition skin, but research is limited and sustainability concerns exist.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Dragon Fruit Juice

Hylocereus Undatus Fruit Juice

3.8

A gentle, water-based ingredient that adds light hydration and antioxidant protection, but its benefits are not as well-studied as more common fruit extracts.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Dulse Seaweed Extract

Dilsea Carnosa Extract

4.0

A gentle, hydrating seaweed extract that may help soothe and protect the skin, but research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Ectoin

Ectoin

4.5

Ectoin is a gentle, multi-tasking ingredient that hydrates, soothes, and shields the skin from environmental stress—great for sensitive or reactive skin.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Humectant

Eel Skin Mucus Extract

Eel Skin Mucus Extract

3.8

Eel skin mucus extract is a novel humectant and film-forming ingredient that helps hydrate and temporarily smooth the skin, but research is still early and it may not be suitable for those with fish allergies.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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Humectant

Einkorn Stem Water

Triticum Monococcum Stem Water

4.0

A gentle, hydrating water from einkorn wheat stems that may help soothe and moisturize skin, but research is limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Endomyces Ferment Filtrate

ENDOMYCES FERMENT FILTRATE

4.0

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

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Enteromorpha Flexuosa Extract

Enteromorpha Flexuosa Extract

4.0

A gentle seaweed extract that helps hydrate and calm the skin, with early research suggesting antioxidant benefits.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Enteromorpha Prolifera Water

ENTEROMORPHA PROLIFERA WATER

4.0

A gentle, hydrating seaweed water that adds light moisture and soothing benefits, ideal for sensitive or dehydrated skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Erman's Birch Sap

Betula Ermanii Sap

4.0

A gentle, hydrating sap from birch trees that may help soothe and lightly moisturize the skin, but scientific evidence is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Erythritol

Erythritol

4.0

Erythritol is a gentle, non-irritating humectant that helps hydrate skin without stickiness, making it a great alternative to glycerin for sensitive or acne-prone skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Ethanolamine Glycerophosphate

ETHANOLAMINE GLYCEROPHOSPHATE

3.8

A gentle synthetic humectant that helps hydrate skin and support barrier function, but research on its long-term benefits is still limited.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Ethoxy Diglycol

3-ETHOXY-1,1-PROPANEDIOL

3.5

A gentle synthetic humectant that helps keep skin hydrated and improves product feel, but offers limited unique benefits compared to alternatives.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Ethyl Aspartate

Ethyl Aspartate

3.5

Ethyl Aspartate is a gentle humectant that helps attract moisture to the skin, but research on its benefits is still limited compared to more established ingredients.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Ethyl Carbazido Hyaluronate

Ethyl Carbazido Hyaluronate

4.0

A next-gen hyaluronic acid derivative that binds to skin for longer-lasting hydration, but research is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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