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

Snail Secretion Ferment Filtrate

Saccharomyces/Snail Secretion Filtrate Ferment Filtrate

4.0

A fermented snail secretion ingredient that hydrates and may help smooth skin texture, but individual results vary and allergic reactions are possible.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Snail Secretion Filtrate

SNAIL SECRETION FILTRATE

4.0

Snail secretion filtrate is a hydrating, soothing ingredient that may help support skin barrier function and calm irritation, but it's not a miracle cure and can be expensive.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Snake Gourd Stem Juice

TRICHOSANTHES KIRILOWII STEM JUICE

3.8

A gentle, hydrating plant juice that adds light moisture and soothing benefits to skincare, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Sodium Allantoin PCA

SODIUM ALLANTOIN PCA

4.0

A gentle, dual-action ingredient that hydrates and soothes skin, making it a good choice for sensitive or irritated skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Butyroyl Hyaluronate

SODIUM BUTYROYL HYALURONATE

4.3

A next-gen hyaluronic acid derivative that sticks to skin longer and penetrates deeper for lasting hydration.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Caprooyl Hyaluronate

Sodium Caprooyl Hyaluronate

4.3

A modified hyaluronic acid that sticks better to skin for deeper, longer-lasting hydration without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Carboxymethyl Beta-Glucan

SODIUM CARBOXYMETHYL BETA-GLUCAN

4.3

A gentle, water-soluble derivative of beta-glucan that hydrates, soothes, and helps strengthen the skin barrier without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Carboxymethyl Dextran

SODIUM CARBOXYMETHYL DEXTRAN

4.0

A gentle, water-soluble derivative of dextran that helps hydrate and form a light film on skin, often used to improve texture and moisture retention.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantfilm-former
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Humectant

Sodium Carboxymethyl Inulin

Sodium Carboxymethyl Inulin

4.0

A gentle, plant-based humectant that hydrates and forms a protective film on skin, with a low risk of irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Dermatan Sulfate

Sodium Dermatan Sulfate

4.0

A gentle, naturally derived humectant that supports skin hydration and firmness, similar to hyaluronic acid but less studied.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Sodium Glucuronate

Sodium Glucuronate

4.0

A gentle, naturally derived humectant that hydrates skin and supports barrier function without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Sodium Glutamate

SODIUM GLUTAMATE

4.0

Sodium glutamate is a gentle humectant that helps your skin hold onto moisture, but it's not a standout ingredient on its own.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Sodium Glycereth-1 Polyphosphate

SODIUM GLYCERETH-1 POLYPHOSPHATE

3.8

A gentle synthetic humectant that helps hydrate skin and improve product feel, but research on its long-term benefits is still limited.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Buffering Agent

Sodium Glycerophosphate

Sodium Glycerophosphate

4.0

Sodium glycerophosphate is a gentle pH balancer and mild humectant that helps maintain product stability without irritating skin.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Sodium Glycinate

Sodium Glycinate

4.0

A gentle, water-loving amino acid salt that helps hydrate skin and keep product pH balanced without irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Sodium Heparosan

Sodium Heparosan

4.3

A biotech humectant that holds many times its weight in water, offering deep, lasting hydration without the stickiness of hyaluronic acid.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Sodium Hyaluronate

Sodium Hyaluronate

4.5

Sodium Hyaluronate is a well-studied, gentle humectant that draws moisture into the skin, making it a staple for hydration without clogging pores.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Sodium Hyaluronate Crosspolymer-3

SODIUM HYALURONATE CROSSPOLYMER-3

4.5

A next-generation hyaluronic acid that sits on the skin's surface to form a long-lasting moisture barrier without feeling sticky.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Hyaluronate Crosspolymer-5

SODIUM HYALURONATE CROSSPOLYMER-5

4.5

A next-generation hyaluronic acid that clings to skin longer for sustained hydration and a smoother look, with very low irritation risk.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Hyaluronate Ferulate

Sodium Hyaluronate Ferulate

4.3

A promising hybrid molecule that pairs deep hydration with antioxidant protection, though research is still emerging compared to its parent ingredients.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantantioxidant
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Humectant

Sodium Lactate

Sodium Lactate

4.2

Sodium lactate is a gentle, water-loving humectant that hydrates the skin without clogging pores, making it a great option for sensitive or oily skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Lactate Methylsilanol

Sodium Lactate Methylsilanol

4.0

A gentle, multi-tasking humectant that combines the hydrating power of sodium lactate with the skin-smoothing benefits of methylsilanol.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Mannose Phosphate

SODIUM MANNOSE PHOSPHATE

4.0

A gentle, sugar-based humectant that helps hydrate skin without irritation, though research is still emerging.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Sodium Oleoyl Hyaluronate

Sodium Oleoyl Hyaluronate

4.0

A gentle, modified hyaluronic acid that sticks to skin longer for lasting hydration without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Pantothenate

Sodium Pantothenate

4.0

A gentle, water-soluble form of vitamin B5 that helps hydrate and soothe the skin without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Sodium PCA Methylsilanol

Sodium PCA Methylsilanol

4.0

A dual-action ingredient that hydrates and leaves a silky, smooth finish—great for dry or dehydrated skin without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantfilm-former
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Humectant

Sodium Phenylacetyl Glutamine

Sodium Phenylacetyl Glutamine

4.0

A gentle, peptide-like ingredient that helps hydrate and calm the skin, with early research suggesting anti-aging potential.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sodium Polygamma-Glutamate

SODIUM POLYGAMMA-GLUTAMATE

4.3

A powerful, natural humectant that holds more water than hyaluronic acid, making it a standout for dry or dehydrated skin.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Sodium Polyglutamate

Sodium Polyglutamate

4.5

A next-generation humectant that holds more water than hyaluronic acid and forms a protective film on the skin.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Sodium Polyglutamate Crosspolymer

SODIUM POLYGLUTAMATE CROSSPOLYMER

4.3

A gentle, biotech-derived humectant that holds onto water better than hyaluronic acid, making it a standout for dry or dehydrated skin.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Sodium Porphyra Yezoensis Extract

SODIUM PORPHYRA YEZOENSIS EXTRACT

4.0

A gentle, hydrating seaweed extract that helps soothe skin and support moisture retention — a promising but less-studied ingredient.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Sodium Silver Thioctoyl Hyaluronate

SODIUM SILVER THIOCTOYL HYALURONATE

3.5

A novel hybrid ingredient that pairs hyaluronic acid's hydration with silver's antimicrobial and thioctic acid's antioxidant properties, but research is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidanthumectant
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Humectant

Sodium Soy Hydrolyzed Collagen

Sodium Soy Hydrolyzed Collagen

3.8

A gentle, water-soluble protein blend that helps hydrate and temporarily smooth the skin's surface, but it cannot replace lost collagen in the deeper layers.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantfilm-former
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Humectant

Sodium Stearoyl Hyaluronate

Sodium Stearoyl Hyaluronate

4.3

A gentle, modified hyaluronic acid that sticks to skin longer than standard HA, offering deep hydration without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Antioxidant

Sodium Thioctoyl Hyaluronate

Sodium Thioctoyl Hyaluronate

4.0

A hybrid ingredient that pairs hyaluronic acid's hydration with alpha-lipoic acid's antioxidant power, but research is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidanthumectant
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Humectant

Sodium Trehalose Octenylsuccinate

SODIUM TREHALOSE OCTENYLSUCCINATE

4.0

A gentle, sugar-based humectant that helps skin retain moisture and improves the feel of products without common irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectanttexture enhancer
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Humectant

Sorbeth-30

SORBETH-30

4.0

Sorbeth-30 is a gentle, water-loving humectant that helps hydrate the skin and improve product texture without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sorbitol

Sorbitol

4.0

Sorbitol is a gentle, plant-derived humectant that hydrates the skin without clogging pores, making it a safe choice for most skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Sorbityl Acetate

SORBITYL ACETATE

3.8

Sorbityl Acetate is a gentle humectant that helps hydrate the skin and improve product feel, but it is less studied than classic humectants like glycerin.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sorbityl Silanediol

Sorbityl Silanediol

4.0

A modern humectant that pulls moisture into skin while leaving a smooth, non-sticky finish — great for dry or dehydrated skin.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantskin conditioning agent
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Humectant

Sorbityl Vanillinal

Sorbityl Vanillinal

3.8

A gentle, semi-synthetic humectant that helps hydrate skin and may offer mild antioxidant protection, but research is still limited.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Sorghum Stalk Juice

SORGHUM BICOLOR STALK JUICE

3.8

A gentle, plant-derived humectant that helps hydrate and soothe skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Sour Cherry Fruit Water

Prunus Cerasus Fruit Water

3.8

A gentle, naturally derived hydrating base with mild antioxidant benefits, best for normal to dry skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Soy Ferment

SACCHAROMYCES/SOY PROTEIN FERMENT

4.0

A gentle, fermented ingredient that helps hydrate and support the skin barrier without irritation.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Humectant

Soy Milk

Glycine Soja (Soybean) Milk

4.0

Soy milk is a mild, hydrating ingredient that can help soothe and soften skin, but it is not a substitute for medical treatments.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Soy Protein Ferment

RAHNELLA/SOY PROTEIN FERMENT

4.0

A gentle, fermented soy protein that helps hydrate and calm the skin, suitable for sensitive types.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Soybean Pulp Extract

Glycine Max Pulp

4.0

A gentle, plant-based ingredient that helps hydrate and soothe the skin, but its benefits are modest compared to more researched actives.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Soybean Seed Water

Glycine Soja Seed Water

4.0

A gentle, hydrating water from soybeans that also offers antioxidant protection, suitable for most skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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