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 20,769
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

Surfactant

Sodium Lauryl Sulfate

Sodium Lauryl Sulfate

3.0

Sodium Lauryl Sulfate is a powerful cleanser that creates rich foam but can strip the skin's natural oils and cause irritation, especially for dry or sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincarecleansing agent
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Surfactant

Sodium Lauryl Sulfoacetate

Sodium Lauryl Sulfoacetate

4.5

A mild, coconut-derived surfactant that cleanses effectively without the irritation often associated with sodium lauryl sulfate (SLS).

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Preservative Booster

Sodium Levulinate

Sodium Levulinate

4.5

A gentle, naturally-derived preservative booster that helps extend product shelf life without harsh chemicals.

Irritation

low

Source

natural

beautyskincarepreservative
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Surfactant

Sodium Lignosulfonate

SODIUM LIGNOSULFONATE

3.8

A mild, plant-derived surfactant that helps mix ingredients and improve product texture, but it's not a star active for skin benefits.

Irritation

low

Source

natural

beautyskincaresurfactant
Read ingredient review

Surfactant

Sodium Linoleate

Sodium Linoleate

4.0

Sodium Linoleate is a gentle, soap-like cleanser derived from linoleic acid that helps remove dirt and oil without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Sodium Macadamiaseedate

SODIUM MACADAMIASEEDATE

4.0

A mild, plant-derived cleanser that effectively removes dirt and oil without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarecleanser
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Abrasive

Sodium Magnesium Fluorosilicate

SODIUM MAGNESIUM FLUOROSILICATE

2.5

An abrasive mineral salt that helps polish teeth or exfoliate skin, but may be too harsh for sensitive skin or gums.

Irritation

moderate

Source

synthetic

beautyskincareabrasive
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pH Adjuster

Sodium Malate

Sodium Malate

3.8

Sodium Malate is a gentle pH adjuster and mild AHA that helps keep products stable and skin slightly exfoliated without harshness.

Irritation

low

Source

semi-synthetic

beautyskincarepH adjuster
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Surfactant

Sodium Mangoamphoacetate

Sodium Mangoamphoacetate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Sodium Mangoseedate

Sodium Mangoseedate

4.0

A mild, plant-derived cleanser that effectively removes dirt and oil without stripping the skin, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarecleanser
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Chelating Agent

Sodium Mannitylphytate

SODIUM MANNITYLPHYTATE

4.0

A gentle, plant-based alternative to synthetic chelators like EDTA that helps keep your products stable and effective.

Irritation

low

Source

natural

beautyskincarechelating agent
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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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Skin conditioning

Sodium Mannuronate Methylsilanol

Sodium Mannuronate Methylsilanol

4.0

A silicon-modified seaweed derivative that may help firm and plump skin by supporting collagen and moisture.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
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Cooling Agent

Sodium Menthyl Succinate

Sodium Menthyl Succinate

4.0

A gentle, non-irritating cooling ingredient that adds a pleasant chill to skincare without the strong smell or sting of menthol.

Irritation

low

Source

semi-synthetic

beautyskincaresensory modifier
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Preservative

Sodium Metabisulfite

Sodium Metabisulfite

3.5

Sodium metabisulfite is an effective preservative and antioxidant, but it can be irritating and may trigger allergic reactions in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarepreservative
Read ingredient review

pH Adjuster

Sodium Metanitrobenzenesulfonate

SODIUM M-NITROBENZENESULFONATE

2.0

A synthetic pH adjuster with limited safety data; best avoided in leave-on products due to potential irritation concerns.

Irritation

moderate

Source

synthetic

beautyskincarepH adjuster
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Chelating Agent

Sodium Metaphosphate

Sodium Metaphosphate

3.8

Sodium Metaphosphate is a safe, effective chelating agent that helps maintain product stability and performance by binding metal ions.

Irritation

low

Source

synthetic

beautyskincarechelating agent
Read ingredient review

Buffering Agent

Sodium Metasilicate

Sodium Metasilicate

3.0

Sodium Metasilicate is an effective pH adjuster but can be highly irritating, especially in leave-on products or for sensitive skin.

Irritation

high

Source

synthetic

beautyskincarepH adjuster
Read ingredient review

Surfactant

Sodium Methoxy PPG-2 Acetate

SODIUM METHOXY PPG-2 ACETATE

3.5

A mild synthetic cleanser that helps remove dirt and oil without stripping the skin, but may cause irritation for very sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Sodium Methyl 2-Sulfolaurate

SODIUM METHYL 2-SULFOLAURATE

4.3

A gentle, coconut-derived surfactant that cleans effectively without stripping the skin, ideal for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Methyl Cocoyl Taurate

Sodium Methyl Cocoyl Taurate

4.5

A mild, coconut-derived surfactant that cleanses effectively without over-drying, making it ideal for sensitive and dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Methyl Isethionate

Sodium Methyl Isethionate

4.5

A gentle, sulfate-free surfactant that cleanses effectively without stripping the skin's natural moisture barrier.

Irritation

low

Source

synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Sodium Methyl Laurate Sulfonate

Sodium Methyl Laurate Sulfonate

4.0

A gentle, biodegradable surfactant that cleans effectively without stripping the skin, making it a popular alternative to harsher sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Sodium Methyl Lauroyl Taurate

Sodium Methyl Lauroyl Taurate

4.5

A mild, effective cleanser that's ideal for sensitive or dry skin, offering a creamy lather without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Methyl Myristate Sulfonate

Sodium Methyl Myristate Sulfonate

4.0

A gentle, effective cleanser that removes dirt and oil without stripping the skin, making it a popular sulfate alternative.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Methyl Oleoyl Taurate

SODIUM METHYL OLEOYL TAURATE

4.5

A mild, sulfate-free surfactant that cleanses without stripping the skin, making it ideal for sensitive and dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Methyl Stearate Sulfonate

Sodium Methyl Stearate Sulfonate

4.0

A gentle, soap-free surfactant that cleans effectively while being kinder to sensitive skin than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Methyl Stearoyl Taurate

Sodium Methyl Stearoyl Taurate

4.3

A mild, sulfate-free surfactant that cleanses effectively without stripping the skin barrier, making it ideal for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Antioxidant

Sodium Methylesculetin Acetate

Sodium Methylesculetin Acetate

4.0

A gentle synthetic antioxidant that helps defend skin from daily environmental damage, but research on its long-term benefits is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Preservative

Sodium Methylparaben

Sodium Methylparaben

3.5

Sodium methylparaben is an effective preservative that prevents microbial growth, but its safety has been debated due to concerns about endocrine disruption.

Irritation

low

Source

synthetic

beautyskincarepreservative
Read ingredient review

Surfactant

Sodium Methyltaurate

Sodium Methyltaurate

4.0

A mild, taurine-based surfactant that cleanses effectively while being gentle on the skin barrier.

Irritation

low

Source

synthetic

beautyskincarecleanser
Read ingredient review

Skin conditioning agent

Sodium Molybdate

Sodium Molybdate

3.5

Sodium molybdate is a trace mineral salt that may help support the skin's natural antioxidant defenses, but research on topical benefits is still emerging.

Irritation

low

Source

synthetic

beautyskincaremineral
Read ingredient review

Anticavity agent

Sodium Monofluorophosphate

SODIUM MONOFLUOROPHOSPHATE

4.5

A well-studied fluoride compound that effectively prevents cavities when used in toothpaste.

Irritation

low

Source

synthetic

beautyoral careanticavity agent
Read ingredient review

Surfactant

Sodium Myreth Sulfate

Sodium Myreth Sulfate

3.5

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

Irritation

moderate

Source

synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Myristate

Sodium Myristate

3.5

Sodium Myristate is an effective cleanser but can be drying for sensitive or dry skin types.

Irritation

moderate

Source

synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Sodium Myristoamphoacetate

Sodium Myristoamphoacetate

4.0

A gentle, coconut-derived surfactant that cleans effectively without over-drying, making it a good choice for sensitive or dry skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Myristoyl Hydrolyzed Collagen

Sodium Myristoyl Hydrolyzed Collagen

4.0

A gentle, amino-acid-based surfactant that cleanses without stripping the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleansersurfactant
Read ingredient review

Surfactant

Sodium Myristoyl Isethionate

Sodium Myristoyl Isethionate

4.5

A mild, coconut-derived cleanser that removes impurities without stripping the skin barrier, ideal for sensitive and dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
Read ingredient review

Surfactant

Sodium Myristyl Aspartate

Sodium Myristyl Aspartate

4.0

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

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
Read ingredient review

Surfactant

Sodium Myristyl Sulfate

Sodium Myristyl Sulfate

3.5

An effective but potentially drying cleanser that may irritate sensitive skin, especially in high concentrations.

Irritation

moderate

Source

synthetic

beautyskincarecleansing
Read ingredient review

Surfactant

Sodium Naphthalenesulfonate

SODIUM NAPHTHALENESULFONATE

3.0

A synthetic surfactant that helps products foam and rinse cleanly, but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review

Surfactant

Sodium Naphthol Sulfonate

SODIUM NAPHTHOL SULFONATE

3.5

A synthetic surfactant that helps cleanse the skin but may cause mild irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincaresurfactant
Read ingredient review