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

Mirabilis Jalapa Extract

MIRABILIS JALAPA FLOWER/LEAF/STEM EXTRACT

3.5

A gentle botanical extract with antioxidant potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Mirabilis Jalapa Flower Extract

MIRABILIS JALAPA FLOWER EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Mirabilis Jalapa Seed Extract

MIRABILIS JALAPA SEED EXTRACT

3.5

A gentle, plant-based extract with antioxidant potential, but more research is needed to confirm its benefits in skincare.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Miracle Fruit Extract

Synsepalum Dulcificum Fruit Extract

3.8

A gentle, antioxidant-rich plant extract that may help soothe skin and fight free radical damage, though research in cosmetics is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin-conditioning agent

Miradenafil

Miradenafil

2.0

Miradenafil is a little-known synthetic compound with very limited published research; its cosmetic benefits and safety profile remain uncertain.

Irritation

moderate

Source

synthetic

beautyskincarepeptide
Read ingredient review

Antioxidant

Mistletoe Extract

Viscum Album Leaf Extract

3.5

Mistletoe extract offers antioxidant and soothing benefits, but research in skincare is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Mitoquinol Mesylate

Mitoquinol Mesylate

3.8

A novel antioxidant that targets cellular energy centers, but research in topical skincare is still early.

Irritation

low

Source

synthetic

beautyskincareantioxidant
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Fragrance Ingredient

Mixed Ionones

Ionones and Methylionones

3.8

Mixed Ionones add a floral, violet-like scent to products and may offer mild antimicrobial benefits, but they are primarily a fragrance ingredient with limited direct skin benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Antioxidant

Miyamayomena Leaf/Stem Extract

MIYAMAYOMENA KORAIENSIS LEAF/STEM EXTRACT

3.5

A gentle plant extract with antioxidant potential, but research is very limited — it's not a proven powerhouse ingredient yet.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Mock Orange Flower Extract

Philadelphus Coronarius Flower Extract

3.5

A gentle flower extract with potential antioxidant and soothing benefits, but research is limited and it's mainly used for its pleasant fragrance and traditional appeal.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Humectant

Molasses Extract

MOLASSES EXTRACT

3.8

Molasses extract is a gentle humectant that helps hydrate and soothe the skin, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Moldavian Balm Extract

Dracocephalum moldavica flower/leaf/stem extract

4.0

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Emollient

Moldavian Dragonhead Seed Oil

Dracocephalum moldavica seed oil

4.0

A gentle, non-greasy seed oil rich in linoleic acid that helps soften and soothe the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Skin conditioner

Moldavian Dragonhead Water

Dracocephalum nutans flower/leaf/stem water

3.8

A gentle, lightly fragrant botanical water that may offer mild soothing and astringent benefits, but lacks strong clinical evidence.

Irritation

low

Source

natural

beautyskincarebotanical water
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Antioxidant

Molokini Portulaca Callus Extract

Portulaca Molokiniensis 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

beautyskincareantioxidant
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Antioxidant

Molucca Raspberry Fruit Extract

RUBUS MOLUCCANUS FRUIT EXTRACT

3.8

A gentle antioxidant-rich fruit extract that may help protect skin from environmental stress, though research on this specific species is limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Molybdenum Aspartate

Molybdenum Aspartate

3.5

Molybdenum aspartate is a trace mineral complex that may offer antioxidant benefits, but research in topical skincare is very limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

Molybdenum Chloride

MOLYBDENUM CHLORIDE

2.5

Molybdenum chloride is a trace mineral salt with theoretical antioxidant benefits, but it is extremely rare in skincare and lacks solid safety or efficacy data for cosmetic use.

Irritation

moderate

Source

synthetic

beautyskincareantioxidant
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Antioxidant

Molybdic Acid

MOLYBDIC ACID

2.0

Molybdic acid is a trace mineral with theoretical antioxidant benefits, but it is not a proven or common skincare ingredient and may pose irritation risks at higher concentrations.

Irritation

moderate

Source

synthetic

beautyskincareantioxidant
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Antioxidant

Momordica Fruit Extract

Momordica Grosvenorii Fruit Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Momordica Fruit Juice

Momordica Grosvenorii Fruit Juice

3.8

A gentle, water-based fruit juice that adds light hydration and antioxidant protection, but research on its skincare benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Fragrance

Monarda Didyma Oil

Monarda Didyma Oil

3.5

Monarda Didyma Oil adds a pleasant minty-citrus scent and may offer mild antimicrobial benefits, but its fragrance components can irritate sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Monascus Argan Ferment

MONASCUS/ARGANIA SPINOSA KERNEL FERMENT EXTRACT

3.8

A fermented argan extract with potential antioxidant benefits, but research is still emerging and it may not be a standout ingredient.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Monascus Ferment Filtrate

Monascus Ferment Filtrate Extract Powder

3.8

A gentle fermented ingredient with antioxidant potential, but research in topical skincare is still limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Emollient

Monascus Fermented Rapeseed Oil

MONASCUS/BRASSICA NAPUS SEED OIL FERMENT

3.8

A fermented oil that may offer antioxidant and skin-softening benefits, but research is limited and it's not a staple ingredient.

Irritation

low

Source

biotech

beautyskincareemollient
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Antioxidant

Monascus Pilosus Ferment Filtrate

Monascus Pilosus Ferment Filtrate

3.8

A gentle fermented ingredient with antioxidant potential, but research is still emerging and it may not be a powerhouse active.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Skin conditioning agent

Monascus Rice Ferment Filtrate

Monascus/Rice Ferment Filtrate

4.0

A fermented rice filtrate that may help brighten and condition skin, but research is still emerging.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Antioxidant

Mondia Whitei Root Extract

Mondia Whitei Root Extract

3.5

A gentle, antioxidant-rich root extract with traditional use but limited modern cosmetic research.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing agent

Mongolian Artemisia Leaf Extract

Artemisia Mongolia Leaf Extract

3.8

A gentle, traditional herb extract that may help calm skin and fight oxidative stress, but research is still early.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Mongolian Dandelion Root Extract

TARAXACUM MONGOLICUM ROOT EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Mongolian Oak Leaf Extract

Quercus Mongolica Leaf Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Monk Fruit Extract

Siraitia Grosvenorii Fruit Extract

4.0

Monk Fruit Extract is a gentle, antioxidant-rich ingredient that may help soothe and protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Monk Fruit Powder

Siraitia Grosvenorii Fruit Powder

3.8

Monk fruit powder is a gentle, antioxidant-rich ingredient that may help soothe skin and protect against environmental stress, but research in cosmetics is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Monochoria Hastata Oil

Monochoria Hastata Oil

3.5

A gentle, plant-based oil that softens and conditions skin, but research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

pH Adjuster

Monosodium Citrate

Monosodium Citrate

4.0

Monosodium citrate is a gentle pH adjuster that helps keep your skincare products stable and kind to your skin's natural barrier.

Irritation

low

Source

synthetic

beautyskincarepH adjuster
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Emollient

Montan Acid Wax

Montan Acid Wax

3.5

A natural wax from lignite that helps thicken and stabilize formulas, but it's not a star active ingredient.

Irritation

low

Source

natural

beautyskincareemollient
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Thickener

Montan Wax

Montan Wax

3.8

Montan wax is a plant-derived wax that helps give lipsticks and creams a smooth, stable texture without clogging pores.

Irritation

low

Source

natural

beautyskincarewax
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Absorbent

Montmorillonite

MONTMORILLONITE

4.0

Montmorillonite is a gentle clay that helps draw out oil and impurities without stripping the skin, making it a solid choice for oily or combination skin types.

Irritation

low

Source

natural

beautyskincareabsorbent
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Antioxidant

Moonflower Extract

Ipomoea Bona-Nox Flower Extract

3.5

Moonflower Extract is a gentle botanical with antioxidant potential, but research on its specific benefits in skincare is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Moonstone Extract

Moonstone Extract

2.5

Moonstone extract is a trendy gemstone ingredient with minimal scientific backing for skincare benefits beyond a placebo or mild soothing effect.

Irritation

low

Source

natural

beautyskincareantioxidant
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Opacifying Agent

Moonstone Powder

Moonstone Powder

3.5

Moonstone powder adds a soft, pearlescent glow to makeup and can gently exfoliate, but its skincare benefits are largely cosmetic rather than active.

Irritation

low

Source

natural

beautyskincarecosmetic
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Antioxidant

Mopane Leaf Extract

Colophospermum mopane leaf extract

3.5

A gentle, antioxidant-rich plant extract with traditional use but limited modern cosmetic research.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Moray Eel Oil

Muraenidae Oil

3.5

Moray eel oil is a novel marine oil that may offer moisturizing benefits, but research is very limited and it may be comedogenic for some.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Morel Mushroom Ferment Filtrate

MORCHELLA ESCULENTA FERMENT FILTRATE

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Moringa Ferment Filtrate

Saccharomyces/Moringa Oleifera Seed Oil/Glycerin Ferment Filtrate

4.0

A gentle, antioxidant-rich ferment that helps soothe and condition skin while supporting a healthy-looking complexion.

Irritation

low

Source

biotech

beautyskincareantioxidantconditioning agent
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Exfoliant

Moringa Fruit Powder

Moringa Oleifera Fruit Powder

4.0

A gentle, natural exfoliating powder packed with antioxidants that can help polish skin without harsh microbeads.

Irritation

low

Source

natural

beautyskincareexfoliant
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Emollient

Moringa Oil

Moringa Pterygosperma Seed Oil

4.3

A lightweight, non-greasy oil that hydrates and helps protect the skin barrier without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Moringa Oil Esters

Moringa Oleifera Seed Oil / Hydrogenated Moringa Oleifera Seed Oil Esters

4.3

A lightweight, non-greasy oil that hydrates and softens skin without clogging pores, with some antioxidant benefits.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Moringa Seed Oil

Moringa Drouhardii Seed Oil

4.0

A lightweight, non-greasy oil that hydrates and helps protect the skin barrier, suitable for most skin types including oily and acne-prone.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Moringa Seedcake Extract

Moringa Oleifera Seedcake Extract

4.0

A gentle, antioxidant-rich extract from moringa seed byproduct that helps protect skin from environmental stress while providing light hydration.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Morning Glory Extract

Ipomoea Purpurea Extract

3.5

A gentle, antioxidant-rich flower extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Morning Glory Seed Extract

Ipomoea nil seed extract

3.5

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Morning Glory Seed Powder

Ipomoea hederacea seed powder

3.5

A gentle, natural exfoliant from morning glory seeds, but research on its safety and efficacy is limited.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Absorbent

Moroccan Lava Clay

Moroccan Lava Clay

4.0

A gentle, mineral-rich clay that helps draw out impurities and control shine without stripping the skin.

Irritation

low

Source

natural

beautyskincareabsorbent
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