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

Humectant

Maltooligosyl Glucoside

Maltooligosyl Glucoside

4.2

A mild, sugar-based humectant that pulls water into the skin without stickiness, making it a great alternative to glycerin for lightweight hydration.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
Read ingredient review

Humectant

Maltose

MALTOSE

4.0

Maltose is a gentle, natural humectant that helps attract and hold moisture in the skin without irritation or clogging pores.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Emollient

Malva Verticillata Seed Oil

Malva Verticillata Seed Oil

4.0

A gentle, plant-based oil that helps soften and hydrate skin without clogging pores, though research is still limited.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Film-Former

Mammarian Hydrolysate

Mammarian Hydrolysate

3.5

A protein hydrolysate that may temporarily smooth and plump skin, but its source and limited research mean it's not a standout ingredient for most routines.

Irritation

low

Source

natural

beautyskincarefilm-former
Read ingredient review

Emollient

Mamushi Oil

Agkistrodon Blomhoffii Sinensis Oil

3.0

Mamushi oil is a traditional emollient with anecdotal benefits, but it lacks modern scientific backing and may pose ethical and allergy concerns.

Irritation

moderate

Source

natural

beautyskincareemollient
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

Abrasive

Manchurian Walnut Shell Powder

Juglans Mandshurica Shell Powder

3.8

A natural, biodegradable physical exfoliant that sloughs off dead skin cells, but its irregular particle shape can be too harsh for sensitive or acne-prone skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

Fragrance

Mandarin Leaf Oil

Citrus Nobilis Leaf Oil

3.8

Mandarin Leaf Oil adds a fresh citrus scent to products but may irritate sensitive skin; its skincare benefits are not well-studied.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

Fragrance

Mandarin Orange Peel Oil

CITRUS/UNSHIU/AURANTIUM/RETICULATA PEEL OIL

4.0

Mandarin Orange Peel Oil adds a fresh citrus scent and mild antioxidant benefits, but can be irritating for sensitive skin, especially in sunlight.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Mandarin Orange Water

CITRUS NOBILIS WATER

3.8

A gentle, aromatic water from mandarin oranges that offers mild skin conditioning and a refreshing feel, but lacks strong scientific backing for major skin benefits.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

Fragrance

Mandarin Peel Oil

Citrus Nobilis Peel Oil Expressed

4.0

Mandarin Peel Oil adds a fresh citrus scent and mild astringent action, but can be irritating for sensitive skin due to natural limonene content.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Exfoliant

Mandarin Peel Powder

Citrus Nobilis Peel Powder

3.8

Mandarin Peel Powder offers gentle physical exfoliation with antioxidant benefits, but its gritty texture and potential for irritation mean it's best suited for occasional use in rinse-off products.

Irritation

moderate

Source

natural

beautyskincareexfoliant
Read ingredient review

Exfoliant

Mandelic Acid

Mandelic Acid

4.2

A gentle AHA that exfoliates and brightens skin with less irritation than glycolic acid, making it ideal for sensitive or darker skin tones.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Antioxidant

Mandrake Root Extract

Mandragora Officinarum Root Extract

2.5

Mandrake root extract is a botanical ingredient with a long history in folklore but very limited modern scientific support for skincare benefits.

Irritation

moderate

Source

natural

beautyskincarebotanical extract
Read ingredient review

Antioxidant

Manganese Acetylmethionate

MANGANESE ACETYLMETHIONATE

3.8

Manganese Acetylmethionine is a gentle antioxidant that may help protect skin from environmental stress, but research is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Manganese Aspartate

Manganese Aspartate

3.5

Manganese aspartate is a trace mineral antioxidant that may help protect skin from environmental stress, but research in topical skincare is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Manganese Chloride

Manganese Chloride

3.5

Manganese chloride is a trace mineral that may support antioxidant defenses in skin, but research on its topical benefits is still limited.

Irritation

low

Source

synthetic

beautyskincaremineral
Read ingredient review

Antioxidant

Manganese Citrate

Manganese Citrate

3.5

Manganese Citrate is a gentle mineral antioxidant that may help protect skin from environmental stress, but research on its topical benefits is still limited.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Manganese Complex

MANGANESE QUINOLYLMETHYLAMINOETHYL PYRIDINYLTRIAZACYCLODODECANE

3.0

A novel synthetic manganese complex with theoretical antioxidant benefits, but very limited research and no established safety or efficacy data in cosmetics.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Colorant

Manganese Dioxide

MANGANESE DIOXIDE

3.5

Manganese dioxide is a safe mineral colorant used in makeup, but it has no proven skincare benefits beyond color and a slight absorbent effect.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Skin conditioning agent

Manganese Glycerophosphate

Manganese Glycerophosphate

3.8

Manganese glycerophosphate is a gentle mineral salt that may support antioxidant activity in skincare, but research on its topical benefits is still limited.

Irritation

low

Source

synthetic

beautyskincaremineral
Read ingredient review

Antioxidant

Manganese Glycinate

Manganese Glycinate

3.8

Manganese glycinate is a gentle antioxidant that may help protect skin from environmental stress, but research in topical skincare is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Colorant

Manganese Oxide

MANGANESE OXIDE

3.5

Manganese oxide is a safe mineral pigment that adds color to makeup and may offer mild antioxidant benefits, but it's not a star skincare active.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Antioxidant

Manganese Sulfate

MANGANESE SULFATE

3.8

Manganese sulfate is a trace mineral that helps your skin's natural antioxidant system, but it's used in tiny amounts and is not a standout ingredient on its own.

Irritation

low

Source

synthetic

beautyskincaremineral
Read ingredient review

Skin conditioning agent

Manganese Tripeptide-1

Manganese Tripeptide-1

4.0

A gentle peptide that may help firm skin and calm irritation, but human research is still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Colorant

Manganese Violet

CI 77742

3.8

Manganese Violet is a safe, non-irritating colorant that adds a muted purple hue to makeup, but it offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Antioxidant

Mangiferin

Mangiferin

4.0

Mangiferin is a gentle plant antioxidant that may help calm redness and protect skin from environmental stress, but human studies are still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Film Former

Mango Butter Copolymer

Mango Butter Dimer Dilinoleyl Esters/Dimer Dilinoleate Copolymer

4.0

A gentle film-forming ingredient that helps makeup and skincare products last longer without feeling heavy or greasy.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
Read ingredient review

Antioxidant

Mango Pulp Extract

Mangifera Indica Pulp Extract

4.0

Mango pulp extract is a gentle, antioxidant-rich ingredient that helps soothe and hydrate skin, but its benefits are mostly from its nutrient content rather than any unique active.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Mango Seed Butter

Mangifera Indica Seed Butter

4.2

A nourishing, non-greasy butter that softens skin and helps protect the moisture barrier without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Mango Seed Glycerides

Mangifera Indica Seed Glycerides

4.3

A gentle, plant-based emollient that hydrates and softens skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Mango Seed Oil

Mangifera Indica Seed Oil

4.3

A nourishing, non-greasy plant oil that softens skin and helps maintain moisture without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Mango Seed Oil PEG-70 Esters

MANGIFERA INDICA (MANGO) SEED OIL PEG-70 ESTERS

4.0

A gentle, water-friendly emollient that adds slip and softness without greasiness, ideal for rinse-off and leave-on products.

Irritation

low

Source

semi-synthetic

beautyskincareemollientsurfactant
Read ingredient review

Humectant

Mangosteen Amino Acids

GARCINIA MANGOSTANA AMINO ACIDS

4.0

A gentle, plant-based amino acid blend that helps hydrate and support the skin barrier, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Antioxidant

Mangosteen Bark Extract

GARCINIA MANGOSTANA BARK EXTRACT

3.8

Mangosteen bark extract is a gentle antioxidant that may help calm skin and fight environmental stress, but research on its topical benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mangosteen Peel Powder

GARCINIA MANGOSTANA PEEL POWDER

4.0

Mangosteen peel powder is a natural antioxidant-rich ingredient that may help calm skin and protect against environmental stress, but more human studies are needed to confirm its benefits.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mangosteen Pericarp Powder

GARCINIA MANGOSTANA PERICARP POWDER

3.8

A gentle antioxidant-rich powder from mangosteen rind that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mangosteen Polyphenol Esters

Caffeic/Coco/Coumaric/Mangosteen Pericarp Esters

4.0

A gentle antioxidant blend from mangosteen rind that helps shield skin from environmental stress and may support a more even tone.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Mangosteen Seed Oil

Garcinia Mangostana Seed Oil

4.0

A lightweight, antioxidant-rich oil that hydrates and soothes skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Mangostin

Mangostin

4.0

Mangostin is a plant-derived antioxidant that helps protect skin from environmental stress and may calm irritation, though more human studies are needed.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Mangrove Leaf Extract

Rhizophora Apiculata Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Absorbent

Manicouagan Clay

Manicouagan Clay

4.0

A mineral-rich clay from a unique geological site, Manicouagan Clay helps absorb excess oil and impurities without over-drying, making it a gentle option for most skin types.

Irritation

low

Source

natural

beautyskincareabsorbent
Read ingredient review

Antioxidant

Manilkara Leaf Extract

Manilkara Multinervis Leaf Extract

3.5

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Manketti Oil

Schinziophyton Rautanenii Kernel Oil

4.3

Manketti oil is a gentle, non-greasy plant oil that deeply hydrates and softens skin without clogging pores, making it a great choice for dry or sensitive skin.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Manketti Oil PEG-8 Esters

SCHINZIOPHYTON RAUTANENII KERNEL OIL PEG-8 ESTERS

4.0

A gentle, water-soluble emollient derived from manketti oil that helps soften and condition skin without a greasy feel.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Emollient

Manketti Oil Polyglyceryl-6 Esters

SCHINZIOPHYTON RAUTANENII KERNEL OIL POLYGLYCERYL-6 ESTERS

4.3

A mild, plant-based emulsifier that helps blend oil and water while leaving skin soft and smooth.

Irritation

low

Source

semi-synthetic

beautyskincareemollientemulsifier
Read ingredient review

Soothing Agent

Manna Ash Sap Extract

Fraxinus Ornus Sap Extract

3.8

A gentle, plant-derived extract that may help calm and hydrate the skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Antioxidant

Manna Ash Seed Extract

FRAXINUS ORNUS SEED EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Mannan

Mannan

4.0

Mannan is a gentle, plant-derived sugar that helps hydrate and soothe skin by forming a protective film.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Emulsifier

Mannitan Laurate

Mannitan Laurate

4.0

A gentle, sugar-derived emulsifier that helps create stable, creamy textures without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
Read ingredient review

Emulsifier

Mannitan Oleate

Mannitan Oleate

4.0

Mannitan Oleate is a gentle, plant-based emulsifier that helps create stable, creamy textures in skincare without common irritation.

Irritation

low

Source

natural

beautyskincareemulsifier
Read ingredient review

Humectant

Mannitol

Mannitol

4.0

Mannitol is a gentle, water-binding sugar alcohol that helps hydrate skin and offers mild antioxidant protection without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Humectant

Mannose

Mannose

4.0

Mannose is a gentle sugar humectant that helps hydrate skin by attracting moisture, with some research suggesting it may support collagen production.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Antioxidant

Mantis Extract

Mantis Extract

2.5

Mantis extract is a novel, insect-derived ingredient with potential antioxidant benefits, but current evidence is very limited and it is not widely used or studied in skincare.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Manuka Leaf Extract

Leptospermum Scoparium Leaf Extract

4.0

A gentle, antioxidant-rich extract that helps calm and protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review