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 4,092
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

Maca Root Powder

LEPIDIUM MEYENII ROOT POWDER

3.8

Maca root powder is a gentle, antioxidant-rich botanical that may help soothe and protect skin, but research on its topical benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

Mace Lignan Extract

Myristica fragrans (Nutmeg) Extract (and) Macelignan

3.8

A promising antioxidant from nutmeg that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Machilus Bark Extract

Machilus Odoratissima Bark Extract

3.8

A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.

Irritation

low

Source

natural

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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Antioxidant

Magnolia Bark Extract

Magnolia Grandiflora Bark Extract

4.0

A gentle botanical extract that helps calm skin and fight environmental stress, but research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Magnolia Bark Ferment Extract

LACTOBACILLUS/SACCHAROMYCES/MAGNOLIA OFFICINALIS BARK FERMENT EXTRACT

4.0

A fermented magnolia bark extract that offers antioxidant and soothing benefits, with fermentation potentially boosting the bioavailability of its active compounds.

Irritation

low

Source

biotech

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Antioxidant

Magnolia Branch Ferment Extract

AUREOBASIDIUM PULLULANS/MAGNOLIA SIEBOLDII BRANCH EXTRACT FERMENT FILTRATE

3.8

A fermented botanical extract with potential antioxidant and soothing properties, but research on its cosmetic benefits is still limited.

Irritation

low

Source

biotech

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Antioxidant

Magnolia Denudata Callus Extract

Magnolia Denudata Callus Extract

4.0

A gentle, antioxidant-rich plant extract that may help calm skin and protect against environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Magnolia Flower Extract

Magnolia Officinalis Flower Extract

4.0

A gentle botanical extract that helps protect skin from environmental stress and may calm minor irritation.

Irritation

low

Source

natural

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Antioxidant

Magnolia Flower Water

Magnolia Glauca Flower Water

4.0

A gentle, antioxidant-rich botanical water that can help soothe and protect the skin, but research on its specific benefits is still emerging.

Irritation

low

Source

natural

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Antioxidant

Magnolia Kobus Extract

Magnolia Kobus Branch/Flower/Leaf Extract

4.0

A gentle plant extract that may help calm skin and fight environmental stress, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Magnolia Kobus Flower Extract

Magnolia Kobus Flower Extract

4.0

A gentle botanical extract that helps protect skin from environmental stress and may calm irritation, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Magnolia Leaf Extract

Magnolia Grandiflora Leaf Extract

4.0

A gentle botanical extract that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

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Antioxidant

Magnolia Lily Flower Extract

Magnolia Liliflora Flower Extract

4.0

A gentle, antioxidant-rich flower extract that may help calm skin and fight environmental stress, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Magnolia Obovata Fruit Extract

Magnolia Obovata Fruit Extract

4.0

A gentle, antioxidant-rich fruit extract that may help calm skin and defend against environmental stress, though human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Magnolia Sieboldii Callus Extract

Magnolia Sieboldii Callus Culture Extract

4.0

A gentle, lab-grown plant extract that may help protect skin from environmental stress and calm irritation, though human studies are limited.

Irritation

low

Source

biotech

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Antioxidant

Magnolia Sieboldii Extract

Magnolia Sieboldii Extract

4.0

A gentle, plant-derived antioxidant extract that may help calm skin and protect against environmental stress, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Magnolia Sieboldii Flower Extract

Magnolia Sieboldii Flower Extract

4.0

A gentle, antioxidant-rich flower extract that helps calm skin and defend against environmental stress, though human studies are still limited.

Irritation

low

Source

natural

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Antioxidant

Magnolia Sieboldii Root Extract

Magnolia Sieboldii Root Extract

4.0

A gentle, plant-derived antioxidant that may help calm skin and defend against environmental stress, though human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Magnolia Wilsonii Callus Extract

Magnolia Wilsonii Callus Extract

4.0

A gentle, antioxidant-rich plant extract that may help calm skin and protect against environmental stress, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Magnolol

Magnolol

4.0

A gentle, plant-derived antioxidant that helps calm skin and fight environmental stress without irritation.

Irritation

low

Source

natural

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Antioxidant

Maitake & Ginseng Ferment Extract

Grifola Frondosa / Panax Ginseng Extract Ferment Filtrate

4.0

A gentle, fermented botanical blend that may help calm skin and defend against environmental stress, though human studies are limited.

Irritation

low

Source

natural

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Soothing Agent

Maitake & Licorice Ferment

Grifola Frondosa / Licorice Root Extract Ferment Filtrate

4.0

A gentle, fermented botanical blend that may help calm skin and provide antioxidant support, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Maitake Mushroom & Arenaria Ferment

Grifola Frondosa Mycelium/Arenaria Kansuensis Extract Ferment Filtrate

3.8

A fermented botanical blend that may offer antioxidant and soothing benefits, but human skin research is still limited.

Irritation

low

Source

biotech

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Antioxidant

Maitake Mushroom Ferment Filtrate

Grifola Frondosa Mycelium Ferment Filtrate Extract

4.0

A gentle, antioxidant-rich mushroom ferment that may help calm and protect the skin, though human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Maitake Mycelium Ferment Extract

Grifola Frondosa Mycelium Ferment Filtrate Extract

3.8

A gentle, antioxidant-rich mushroom ferment that may help calm skin and defend against environmental stress, though human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Maitake-Burdock Ferment Extract

Grifola Frondosa/Arctium Lappa Fruit Extract Ferment Filtrate

4.0

A fermented botanical blend that may help calm skin and fight free radicals, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Maitake-Yerba Mate Ferment

Grifola Frondosa/Ilex Paraguariensis Leaf Extract Ferment Filtrate

4.0

A gentle, antioxidant-rich fermented blend that may help calm skin and defend against environmental stress.

Irritation

low

Source

natural

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Antioxidant

Malachite Extract

Malachite Extract

3.8

Malachite extract is a mineral-derived antioxidant that may help calm skin and protect against environmental stress, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Malachite Ferment

Saccharomyces/Malachite Ferment

4.0

A gentle, copper-infused yeast ferment that may help calm skin and defend against environmental stress, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Male Fern Leaf Extract

Dryopteris Filix-Mas Leaf Extract

3.5

A gentle plant extract with antioxidant potential, but research on its benefits for skin is still limited.

Irritation

low

Source

natural

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Antioxidant

Mallotus Bark Extract

Mallotus Japonicus Bark Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Mallotus Japonicus Leaf Extract

Mallotus Japonicus Leaf Extract

3.8

A plant-based antioxidant extract that may help calm skin and fight free radical damage, though human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Manchurian Violet Flower Extract

Viola Mandshurica Flower Extract

3.8

A mild, plant-based antioxidant extract that may help calm skin and fight free radicals, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Mandarin & Rosemary Fruit Extract

Citrus Nobilis Fruit/Rosmarinus Officinalis Extract

4.0

A gentle antioxidant-rich botanical blend that helps protect skin from environmental stress and may calm minor irritation.

Irritation

low

Source

natural

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Antioxidant

Mandarin Leaf Extract

Citrus Nobilis Leaf Extract

4.0

A gentle plant extract that provides antioxidant protection and a subtle botanical scent, but research on its specific skin benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

Mandarin Orange Fruit Extract

Citrus Nobilis Fruit Extract

4.0

Mandarin Orange Fruit Extract is a gentle antioxidant-rich extract that helps protect skin from environmental stress and may brighten the complexion.

Irritation

low

Source

natural

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Antioxidant

Mandarin Orange Juice

Citrus Nobilis Fruit Juice

3.8

Mandarin orange juice offers gentle antioxidant and exfoliating benefits, but its natural acidity and potential for phototoxicity require careful formulation.

Irritation

moderate

Source

natural

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Antioxidant

Mandarin Peel Extract

Citrus Nobilis Peel Extract

4.0

Mandarin Peel Extract offers antioxidant protection and a gentle citrus scent, but its benefits are best supported by general citrus research rather than mandarin-specific studies.

Irritation

low

Source

natural

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