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

Antioxidant

Machilus Thunbergii Branch Extract

Machilus Thunbergii Branch Extract

3.8

A gentle botanical extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Machilus Thunbergii Seed Oil

Machilus Thunbergii Seed Oil

3.8

A gentle, non-greasy oil that helps soften and soothe skin, but research on its unique benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Maclura Aurantiaca Wood Extract

Maclura Aurantiaca Wood Extract

3.8

A plant-based antioxidant extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Maclura Pomifera Fruit Extract

MACLURA POMIFERA FRUIT EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Macropiper Excelsum Leaf Extract

MACROPIPER EXCELSUM LEAF EXTRACT

3.8

A gentle botanical extract with antioxidant potential, but research is limited and it's not a powerhouse ingredient on its own.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Macropiper Excelsum Leaf Powder

MACROPIPER EXCELSUM LEAF POWDER

3.8

A gentle botanical powder with traditional soothing and antioxidant potential, but scientific research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Macrotomia Euchroma Root Extract

Macrotomia Euchroma Root Extract

3.8

A gentle, plant-derived antioxidant that may help calm skin and fight environmental stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing agent

Madecassic Acid

Madecassic Acid

4.3

Madecassic acid is a soothing, skin-repairing compound from Centella asiatica that helps calm irritation and support the skin barrier.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing agent

Madecassoside

MADECASSOSIDE

4.5

A gentle, research-backed soothing ingredient from cica that helps calm redness and support skin repair without irritation.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing agent

Madonna Lily Bulb Extract

Lilium Candidum Bulb Extract

3.8

A gentle botanical extract that may help calm skin and provide antioxidant support, but research is still early.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Madonna Lily Callus Extract

Lilium Candidum Callus Culture Extract

4.0

A gentle, lab-grown lily extract that may help calm skin and fight environmental stress, but research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Madonna Lily Callus Ferment

SACCHAROMYCES/LILIUM CANDIDUM CALLUS EXTRACT FERMENT EXTRACT FILTRATE

3.8

A gentle, biotech-derived ingredient that may help calm and protect skin, though human studies are still limited.

Irritation

low

Source

biotech

beautyskincareantioxidantsoothing
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Soothing Agent

Madonna Lily Flower Extract

Lilium Candidum Flower Extract

3.8

A gentle botanical extract that may help calm skin and provide antioxidant support, though research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical
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Fragrance

Madonna Lily Flower Water

LILIUM CANDIDUM FLOWER WATER

3.8

A gentle, lightly astringent floral water that adds a subtle lily scent and soothing feel to skincare products, but has limited research on specific skin benefits.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Madonna Lily Leaf Cell Extract

Lilium Candidum Leaf Cell Extract

3.8

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

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Madrox

MADROX

3.0

Madrox is a little-known ingredient with minimal published research; its benefits are unclear and it may be a trade name for a blend.

Irritation

low

Source

mixed

beautyskincareantioxidant
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Antioxidant

Maesa Japonica Extract

Maesa Japonica Extract

3.8

A gentle plant extract with antioxidant potential, but research is limited—think of it as a supportive, not star, ingredient.

Irritation

low

Source

natural

beautyskincareantioxidant
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pH Adjuster

Magnesium Acetate

Magnesium Acetate

3.8

A gentle pH adjuster that helps keep your skincare products stable and skin-friendly, but offers no direct skin benefits.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
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Antioxidant

Magnesium Acetylmethionate

Magnesium Acetylmethionate

4.0

A gentle antioxidant that pairs magnesium with a modified amino acid to help protect skin from environmental stress and support a healthy-looking complexion.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Magnesium Ascorbate

MAGNESIUM ASCORBATE

4.3

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

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Magnesium Ascorbate/PCA

MAGNESIUM ASCORBATE/PCA

4.2

A gentle, stable vitamin C option that brightens skin and supports hydration without the irritation of pure ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Magnesium Ascorbyl Borate

MAGNESIUM ASCORBYLBORATE

4.0

A gentle, stabilized vitamin C derivative that brightens skin and fights free radicals with less irritation than pure L-ascorbic acid.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Magnesium Ascorbyl Phosphate

Magnesium 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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Humectant

Magnesium Aspartate

Magnesium Aspartate

4.0

Magnesium Aspartate is a gentle, hydrating mineral salt that helps support skin barrier function and soothe irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Preservative

Magnesium Benzoate

Magnesium Benzoate

3.5

Magnesium Benzoate is a gentle preservative that helps keep products fresh, but it may cause mild irritation in very sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Soothing Agent

Magnesium Bromide

MAGNESIUM BROMIDE

3.5

Magnesium bromide is a gentle mineral salt that may help calm irritated skin, but research is limited and it's not a mainstream ingredient.

Irritation

low

Source

natural

beautyskincaremineral
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Absorbent

Magnesium Carbonate

Magnesium Carbonate

3.8

A safe, non-irritating mineral powder that absorbs oil and moisture, commonly used in deodorants and loose powders.

Irritation

low

Source

natural

beautyskincarecosmetic
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Humectant

Magnesium Chloride

Magnesium Chloride

4.0

Magnesium chloride is a gentle mineral salt that helps hydrate, calm, and support the skin barrier, but it can feel drying if overused or used in high concentrations.

Irritation

low

Source

natural

beautyskincaremineral
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Humectant

Magnesium Citrate

Magnesium Citrate

3.8

Magnesium citrate is a gentle, water-soluble salt that can help exfoliate and hydrate skin without the irritation of stronger acids.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Surfactant

Magnesium Coceth Sulfate

Magnesium Coceth Sulfate

3.5

A milder sulfate surfactant that effectively cleanses but may still be drying for sensitive skin.

Irritation

moderate

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Magnesium Coco-Sulfate

Magnesium Coco-Sulfate

3.8

A gentler sulfate cleanser that effectively removes dirt and oil while being less stripping than sodium lauryl sulfate.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Magnesium Cocoate

Magnesium Cocoate

4.0

A gentle, coconut-derived soap ingredient that cleans without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarecleansing agent
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Bulking Agent

Magnesium Fluoride

Magnesium Fluoride

2.5

Magnesium fluoride is a mineral salt used mainly as a bulking or abrasive agent in cosmetics; it offers no proven skincare benefits and may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

beautyskincareabrasive
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Humectant

Magnesium Glucoheptonate

Magnesium Glucoheptonate

3.8

A gentle humectant that pulls moisture into the skin and may help calm irritation, but research is still limited.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Skin conditioning

Magnesium Gluconate

Magnesium Gluconate

4.0

A gentle, water-soluble form of magnesium that helps calm skin and support its natural barrier without clogging pores.

Irritation

low

Source

synthetic

beautyskincaremineral
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Skin conditioning

Magnesium Glycerophosphate

MAGNESIUM GLYCEROPHOSPHATE

4.0

A gentle mineral salt that delivers magnesium to the skin, potentially supporting barrier repair and calming irritation.

Irritation

low

Source

synthetic

beautyskincaremineral
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Skin conditioning

Magnesium Glycinate

Magnesium Glycinate

4.0

A gentle, well-absorbed form of magnesium that may help calm stressed skin and support a healthy moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincaremineral
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Antioxidant

Magnesium Hydride

Magnesium Hydride

2.5

Magnesium hydride is a novel ingredient that releases hydrogen gas on contact with water, but its skincare benefits are not well-established and it may cause irritation.

Irritation

moderate

Source

synthetic

beautyskincareantioxidant
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pH Adjuster

Magnesium Hydroxide

Magnesium Hydroxide

3.8

Magnesium hydroxide is a gentle mineral pH adjuster and oil absorber, but can be drying for some skin types.

Irritation

moderate

Source

natural

beautyskincarepH adjuster
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Humectant

Magnesium Lactate

MAGNESIUM LACTATE

4.0

A gentle, hydrating magnesium salt that supports skin barrier function without clogging pores.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Emulsifier

Magnesium Lanolate

Magnesium Lanolate

3.5

Magnesium Lanolate is a gentle emulsifier that helps blend oil and water in creams, but may clog pores for acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Viscosity controlling agent

Magnesium Laurate

Magnesium Laurate

3.5

A mild thickening and opacifying agent that helps give products a creamy, opaque appearance without major skin concerns.

Irritation

low

Source

synthetic

beautyskincarecosmetic ingredient
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Surfactant

Magnesium Laureth Sulfate

Magnesium Laureth Sulfate

3.8

A gentler alternative to sodium lauryl sulfate that effectively cleanses without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing agent
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Surfactant

Magnesium Laureth-5 Sulfate

MAGNESIUM LAURETH-5 SULFATE

3.8

A milder alternative to sodium lauryl sulfate, but still a surfactant that can be drying for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincarecleanser
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Surfactant

Magnesium Laureth-8 Sulfate

Magnesium Laureth-8 Sulfate

3.8

A gentle, sulfate-based cleanser that effectively removes impurities while being less harsh than traditional sulfates.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Surfactant

Magnesium Lauryl Sulfate

Magnesium Lauryl Sulfate

3.8

A moderately gentle sulfate surfactant that effectively removes dirt and oil but may still be drying for sensitive or dry skin.

Irritation

moderate

Source

synthetic

beautyskincarecleansing agent
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Antioxidant

Magnesium Lithospermate B

MAGNESIUM LITHOSPERMATE B

3.8

A promising plant antioxidant with early research suggesting it may help calm and protect skin, but more human studies are needed to confirm its benefits.

Irritation

low

Source

natural

beautyskincareantioxidant
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Colorant

Magnesium Manganese Titanium Oxide

MAGNESIUM/MANGANESE/TITANIUM OXIDE

3.5

A safe, non-irritating mineral pigment that provides color and some UV protection, but its effectiveness as a sunscreen ingredient is limited compared to zinc oxide or titanium dioxide alone.

Irritation

low

Source

synthetic

beautyskincaremineral
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