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

Preservative Booster

Sodium Anisate

Sodium Anisate

4.0

A gentle, plant-derived preservative booster that helps keep your skincare fresh without common irritants.

Irritation

low

Source

natural

beautyskincarepreservative
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Surfactant

Sodium Arachidate

Sodium Arachidate

3.5

Sodium Arachidate is a mild soap ingredient that helps cleanse and emulsify, but it's not a standout active for skin benefits.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Sodium Arganamphoacetate

Sodium Arganamphoacetate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Sodium Arganate

Sodium Arganate

4.0

A mild, plant-derived surfactant that cleanses without stripping the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarecleanser
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Antioxidant

Sodium Ascorbate

Sodium Ascorbate

4.0

A gentler, more stable form of vitamin C that brightens skin and fights free radicals with less sting than pure ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Sodium Ascorbyl Glucoside

SODIUM ASCORBYL GLUCOSIDE

4.3

A gentle, stable form of vitamin C that brightens skin and fights free radicals without the irritation of pure L-ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Sodium Ascorbyl Phosphate

Sodium Ascorbyl Phosphate

4.5

A gentle, stable form of vitamin C that brightens skin and fights free radicals without the irritation of pure ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Surfactant

Sodium Avocadoate

Sodium Avocadoate

4.0

A gentle, plant-derived cleanser that effectively removes dirt and oil without stripping the skin.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Babassu Sulfate

SODIUM BABASSU SULFATE

4.0

A gentle, plant-based surfactant that cleanses effectively without stripping the skin, making it a popular choice for sensitive skin.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Babassuamphoacetate

Sodium Babassuamphoacetate

4.3

A gentle, plant-based surfactant that cleans without stripping the skin, ideal for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Babassuate

Sodium Babassuate

4.0

A gentle, plant-based cleanser that effectively removes dirt and oil without stripping the skin.

Irritation

low

Source

natural

beautyskincarecleanser
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Surfactant

Sodium Behenate

Sodium Behenate

4.0

A gentle cleansing agent that helps bar soaps hold their shape and creates a creamy lather without stripping the skin.

Irritation

low

Source

synthetic

beautyskincarecleansing
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Emulsifier

Sodium Behenoyl Lactylate

Sodium Behenoyl Lactylate

4.3

A mild, biodegradable emulsifier that creates stable, creamy textures and leaves skin feeling soft without irritation.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Preservative

Sodium Benzoate

Sodium Benzoate

4.0

Sodium Benzoate is a safe, well-studied preservative that keeps your products fresh and free from harmful bacteria and fungi.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Surfactant

Sodium Beta-Sitosteryl Sulfate

SODIUM BETA-SITOSTERYL SULFATE

3.8

A gentle, plant-based surfactant that helps cleanse without stripping the skin, but it's not as widely studied as more common cleansing agents.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Buffering Agent

Sodium Bicarbonate

SODIUM BICARBONATE

3.5

Sodium bicarbonate can gently exfoliate and adjust pH, but its alkalinity may disrupt the skin barrier if used too frequently or at high concentrations.

Irritation

moderate

Source

natural

beautyskincarebuffering agent
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Preservative

Sodium Bischlorophenyl Sulfamine

Sodium Bischlorophenyl Sulfamine

3.5

A synthetic antimicrobial that can help preserve products and target acne-causing bacteria, but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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pH Adjuster

Sodium Bisulfate

SODIUM BISULFATE

3.5

Sodium bisulfate is a safe pH adjuster in small amounts, but can be irritating at high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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Preservative

Sodium Bisulfite

SODIUM BISULFITE

3.5

Sodium bisulfite is an effective preservative but can cause irritation or allergic reactions in sensitive individuals, especially those with sulfite sensitivity.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
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Buffering Agent

Sodium Borate

Sodium Borate

3.5

Sodium borate helps stabilize pH and preserve formulas, but it can be irritating for sensitive skin at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarebuffer
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Reducing Agent

Sodium Borohydride

SODIUM BOROHYDRIDE

2.0

Sodium borohydride is a synthetic chemical used in tiny amounts as a processing aid in cosmetics, not a direct skincare ingredient, and its safety depends on proper formulation.

Irritation

moderate

Source

synthetic

beautyskincarestabilizer
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Surfactant

Sodium Butoxyethoxy Acetate

Sodium Butoxyethoxy Acetate

3.8

A mild synthetic surfactant that helps cleanse without stripping the skin, but may cause irritation for very sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
Read ingredient review

Preservative

Sodium Butylparaben

SODIUM BUTYLPARABEN

2.5

Sodium butylparaben is an effective preservative but has raised safety concerns, especially regarding potential endocrine disruption, leading many brands to phase it out.

Irritation

low

Source

synthetic

beautyskincarepreservative
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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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Surfactant

Sodium C10-15 Pareth Sulfate

Sodium C10-15 Pareth Sulfate

3.8

A milder alternative to sodium lauryl sulfate that effectively cleanses without stripping the skin as harshly.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium C10-16 Alkyl Sulfate

Sodium C10-16 Alkyl Sulfate

3.8

A moderately strong cleanser that effectively removes dirt and oil but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Sodium C10-16 Pareth-2 Sulfate

SODIUM C10-16 PARETH-2 SULFATE

3.5

A milder alternative to sodium lauryl sulfate that effectively cleanses but can still be drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium C11-15 Alkyl Sulfate

SODIUM C11-15 ALKYL SULFATE

3.5

An effective but potentially drying cleanser that can strip natural oils; best for oily skin or occasional use.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
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Surfactant

Sodium C11-15 Pareth-7 Carboxylate

SODIUM C11-15 PARETH-7 CARBOXYLATE

4.0

A gentle, low-irritation surfactant that effectively cleanses while being kinder to sensitive skin than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Sodium C12-13 Alkyl Sulfate

SODIUM C12-13 ALKYL SULFATE

3.5

A strong, effective cleanser that can be drying or irritating for sensitive skin, but is generally safe in rinse-off formulas.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
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Surfactant

Sodium C12-13 Pareth Sulfate

SODIUM C12-13 PARETH SULFATE

3.5

A gentler alternative to sodium lauryl sulfate, but still a strong cleanser that may strip moisture for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
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Surfactant

Sodium C12-13 Pareth-12 Carboxylate

SODIUM C12-13 PARETH-12 CARBOXYLATE

4.0

A gentle, semi-synthetic surfactant that cleanses effectively while being less likely to irritate sensitive skin than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Surfactant

Sodium C12-14 Olefin Sulfonate

Sodium C12-14 Olefin Sulfonate

3.5

A strong, effective cleanser that can be drying or irritating for sensitive skin, but is generally safe for normal skin types.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
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Surfactant

Sodium C12-14 Pareth-3 Sulfate

SODIUM C12-14 PARETH-3 SULFATE

3.5

A milder alternative to sodium lauryl sulfate that effectively cleanses but may still be drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium C12-15 Alkyl Sulfate

SODIUM C12-15 ALKYL SULFATE

3.5

A strong, effective cleanser that can be drying or irritating for sensitive skin, but is generally safe in rinse-off products.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
Read ingredient review