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

Methoxytrimethylphenyl Dihydroxyphenyl Propanol

Methoxytrimethylphenyl Dihydroxyphenyl Propanol

3.8

A synthetic antioxidant that may help protect skin from oxidative damage, but research is still early and it's less common than established antioxidants like vitamin C or E.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methyl 3-Methylresorcylate

Methyl 3-Methylresorcylate

3.8

A synthetic antioxidant that may help protect skin from environmental stress, but research on its efficacy in cosmetics is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methyl Aloesinyl Cinnamate

METHYL ALOESINYL CINNAMATE

3.5

A novel synthetic ingredient with potential soothing and antioxidant benefits, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methyl Hesperidin

METHYL HESPERIDIN

4.0

A gentle, stable antioxidant derived from citrus that may help brighten skin and support microcirculation, especially around the eyes.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methyl Tryptophanate HCl

METHYL TRYPTOPHANATE HCL

3.5

A gentle, lab-made amino acid derivative that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methyl Vanillate

Methyl Vanillate

4.0

Methyl Vanillate is a gentle antioxidant that helps protect skin from environmental stress while offering a subtle vanilla-like scent.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methylcyclohexanedione

METHYLCYCLOHEXANEDIONE

3.5

Methylcyclohexanedione is a synthetic antioxidant that helps protect products from oxidation, but its benefits for skin are not well-studied.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methylene Di-T-Butylcresol

METHYLENE DI-T-BUTYLCRESOL

4.0

A reliable synthetic antioxidant that protects product freshness but offers minimal direct skin benefit.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methylfurfural

METHYLFURFURAL

3.5

Methylfurfural is a natural antioxidant compound with limited research in skincare; it may offer some protective benefits but can be irritating at high levels.

Irritation

moderate

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methyloxopropoxy-Pyranone

2-Methyl-3-oxopropoxy-pyran-4-one

3.5

A synthetic antioxidant that helps stabilize formulas, but research on its skin benefits is limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methylseleno Carboxypropylglutamine

METHYLSELENOCYSTEINE

3.5

A selenium-based antioxidant that may help protect skin from oxidative stress, but research is still emerging and it's less common than traditional antioxidants.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methylsilanol Ascorbate

METHYLSILANOL ASCORBATE

4.0

A gentle, stabilized vitamin C derivative that pairs antioxidant protection with silicon for added skin-firming benefits.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Methylthiazolyl Ethanol

METHYLTHIAZOLYL-ETHANOL

3.8

A synthetic antioxidant that may help protect skin from environmental damage, but research is still early.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mexican Yam Root Extract

DIOSCOREA MEXICANA ROOT EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Microalgae Callus Extract

PSEUDOCHLORODESMIS AUSTRALIS CALLUS CULTURE EXTRACT

4.0

A lab-grown microalgae extract that may help calm skin and fight free radical damage, though human studies are still limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Humectant

Microalgae Extract Blend

THALASSIOSIRA AESTIVALIS/GRAVIDA/NITZSCHIOIDES/NORDENSKIOELDII/ROTULA EXTRACT

4.0

A blend of marine microalgae that helps hydrate and protect the skin with antioxidant benefits, though research on this specific mix is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
Read ingredient review

Antioxidant

Microalgae Ferment Extract

ISOCHRYSIS GALBANA/PHAEODACTYLUM TRICORNUTUM EXTRACT

4.0

A gentle, antioxidant-rich algae blend that may help hydrate and protect skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Microalgae Peptide Complex

R-CHAETOCEROS NEOGRACILE POLYPEPTIDE-1

3.8

A marine-derived peptide with promising antioxidant potential, but human studies are still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Microcitrus Fruit Extract

MICROCITRUS AUSTRALASICA FRUIT EXTRACT

4.0

A gentle, antioxidant-rich fruit extract that may help brighten skin and protect against environmental damage, but more human studies are needed.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Micrococcus Milk Ferment

MICROCOCCUS/HYDROLYZED NONFAT MILK FERMENT

3.8

A fermented milk ingredient that may help protect skin from environmental stress, but research is still early and benefits are not fully proven.

Irritation

low

Source

biotech

beautyskincareantioxidantskin conditioning
Read ingredient review

Antioxidant

Microglena Reginae Extract

MICROGLENA REGINAE EXTRACT

3.8

A microalgae extract that may offer antioxidant benefits and light hydration, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mignonette Extract

Reseda Odorata Flower/Leaf/Stem Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Milk Thistle Callus Extract

Silybum Marianum Callus Extract

4.0

A gentle, antioxidant-rich extract from milk thistle callus cells that may help protect skin from environmental stress and support a calm complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Milk Thistle Ethyl Ester

SILYBUM MARIANUM ETHYL ESTER

4.0

A stabilized form of milk thistle extract that helps defend skin from environmental stress and supports a more even tone.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Milk Thistle Powder

Silybum Marianum Powder

3.8

Milk thistle powder is a gentle, antioxidant-rich botanical that may help calm and protect skin, but its benefits are best supported by oral supplement research rather than topical studies.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Millet Seed Extract

Panicum Miliaceum Seed Extract

4.0

A mild, plant-based antioxidant that helps calm irritation and protect skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Millet Sprout Extract

Panicum Miliaceum Sprout Extract

4.0

A gentle, antioxidant-rich plant extract that helps calm and protect the skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mimosa Pudica Callus

MIMOSA PUDICA CALLUS

3.8

Mimosa pudica callus is a gentle, antioxidant-rich plant ingredient that may help calm skin and protect against environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mint Callus Culture Extract

Mentha Herba Callus Culture Extract

4.0

A lab-grown mint extract that offers antioxidant benefits without the variability of field-grown plants.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mirabilis Jalapa Callus Extract

MIRABILIS JALAPA CALLUS EXTRACT

3.8

A gentle, plant-derived antioxidant that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Mirabilis Jalapa Callus Powder

MIRABILIS JALAPA CALLUS POWDER

3.8

A gentle, plant-derived ingredient with antioxidant potential, but research on its specific skincare benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

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

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
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
Read ingredient review