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

UV Absorber

Mycosporine Glycine

Mycosporine Glycine

4.0

A promising natural UV filter and antioxidant from marine sources, but still emerging in human skincare research.

Irritation

low

Source

natural

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Antioxidant

Myrcene

MYRCENE

3.8

Myrcene is a plant-derived terpene with antioxidant potential, but its primary role in skincare is often as a fragrance component, and it may cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

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Antioxidant

Myrica Rubra Fruit Juice

Myrica Rubra Fruit Juice

3.8

A gentle, antioxidant-rich fruit juice that may help soothe and protect skin, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Myrica Rubra Leaf/Stem Extract

Myrica Rubra Leaf/Stem Extract

4.0

A gentle, plant-based antioxidant that helps protect skin from environmental stress while offering mild soothing benefits.

Irritation

low

Source

natural

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Antioxidant

Myricetin

MYRICETIN

4.0

Myricetin is a plant-based antioxidant that may help protect skin from environmental damage and support a more even complexion, though human studies are still limited.

Irritation

low

Source

natural

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Antioxidant

Myricitrin

MYRICITRIN

3.8

A 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

Myristyl 2-Glyceryl Ascorbate

Myristyl 2-Glyceryl Ascorbate

4.3

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

Irritation

low

Source

semi-synthetic

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Antioxidant

Myristyl 3-Glyceryl Ascorbate

MYRISTYL 3-GLYCERYL ASCORBATE

4.3

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

Irritation

low

Source

semi-synthetic

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Antioxidant

Myrothamnus Callus Extract

MYROTHAMNUS FLABELLIFOLIA CALLUS CULTURE EXTRACT

4.0

A lab-grown extract from the resurrection plant that may help shield skin from environmental damage and support moisture retention, though human studies are still limited.

Irritation

low

Source

biotech

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Humectant

Myrothamnus Flabellifolia Extract

MYROTHAMNUS FLABELLIFOLIA LEAF/STEM EXTRACT

4.0

A unique plant extract from the 'resurrection plant' that helps skin retain moisture and defend against environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Myrothamnus Flabellifolia Leaf Extract

Myrothamnus Flabellifolia Leaf Extract

4.0

A unique plant extract that may help shield skin from environmental damage and support resilience, though human research is still limited.

Irritation

low

Source

natural

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Antioxidant

Myrrh Leaf Cell Extract

COMMIPHORA MYRRHA LEAF CELL EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Myrsine Africana Leaf Extract

MYRSINE AFRICANA LEAF EXTRACT

3.8

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

Irritation

low

Source

natural

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Fragrance Component

Myrtenal

MYRTENAL

3.5

Myrtenal is a natural aromatic compound with antioxidant potential, but its use in skincare is limited by its strong scent and moderate irritation risk.

Irritation

moderate

Source

natural

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Antioxidant

Myrtle Stem Extract

Myrtus Communis Stem Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

N-Adamantanoyl Dopamine

N-Adamantanoyl Dopamine

3.5

A novel synthetic antioxidant with early research suggesting skin benefits, but long-term safety and efficacy data are limited.

Irritation

low

Source

synthetic

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Antioxidant

N-Caffeoyl Serotonin

N-Caffeoyl Serotonin

3.8

A gentle antioxidant that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

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Antioxidant

N-Coumaroyl Serotonin

N-Coumaroyl Serotonin

3.8

A gentle antioxidant that may help calm skin and defend against environmental stress, though research in cosmetics is still early.

Irritation

low

Source

natural

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Antioxidant

N-Cyclohexanoyl Dopamine

N-Cyclohexanoyl Dopamine

3.5

A lab-made molecule inspired by dopamine that may help protect skin from oxidative stress, but human research is still very limited.

Irritation

low

Source

synthetic

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Antioxidant

N-Feruloyl Dopamine

N-Feruloyl Dopamine

3.5

A plant-derived antioxidant that may help shield skin from pollution and UV damage, but research in cosmetics is still early.

Irritation

low

Source

natural

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Antioxidant

N-Feruloyl Serotonin

N-Feruloyl Serotonin

4.0

A gentle, plant-inspired antioxidant that may help calm skin and defend against pollution and UV damage, but human studies are still limited.

Irritation

low

Source

natural

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Antioxidant

N-Nicotinoyl Dopamine

N-Nicotinoyl Dopamine

3.5

A novel synthetic antioxidant that may help protect skin from environmental stress, but human research is very limited.

Irritation

low

Source

synthetic

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Antioxidant

NADP

Nicotinic Acid Adenine Dinucleotide Phosphate

3.0

NADP is a cellular energy coenzyme with theoretical antioxidant benefits, but its effectiveness in skincare is not yet well-supported by human studies.

Irritation

low

Source

biotech

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Antioxidant

Nannochloropsis Gaditana Extract

Nannochloropsis Gaditana Extract

4.0

A marine microalgae extract that provides antioxidant protection and hydration, with early research suggesting benefits for skin barrier support and environmental stress defense.

Irritation

low

Source

natural

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Antioxidant

Nannochloropsis Oceanica Powder

Nannochloropsis Oceanica Powder

4.0

A gentle marine microalgae powder that offers antioxidant protection and soothing benefits, ideal for sensitive or environmentally stressed skin.

Irritation

low

Source

natural

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Antioxidant

Nannochloropsis Oculata Extract

Nannochloropsis Oculata Extract

4.0

A gentle marine algae extract that helps protect skin from environmental stress and supports a healthy-looking complexion.

Irritation

low

Source

natural

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Antioxidant

Nannochloropsis Oculata Powder

Nannochloropsis Oculata Powder

4.0

A gentle, antioxidant-rich marine microalgae that helps protect skin from environmental stress and supports a healthy-looking complexion.

Irritation

low

Source

natural

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Antioxidant

Naranjilla Fruit Extract

Solanum Quitoense Fruit Extract

4.0

A gentle, antioxidant-rich fruit extract that may help soothe and brighten skin, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Naranjilla Fruit Juice

Solanum Quitoense Fruit Juice

3.8

Naranjilla fruit juice is a gentle, antioxidant-rich ingredient that may help soothe and protect skin, but research is still limited.

Irritation

low

Source

natural

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Antioxidant

Narcissus Callus Extract

NARCISSUS TAZETTA CALLUS EXTRACT

3.8

A gentle, plant-derived antioxidant that may help protect skin from environmental stress and support a more even tone, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Narcissus Poeticus Callus Extract

NARCISSUS POETICUS CALLUS EXTRACT

3.8

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

Irritation

low

Source

natural

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Antioxidant

Narcissus Triandrus Extract

NARCISSUS TRIANDRUS EXTRACT

3.8

A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

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Antioxidant

Naringenin

Naringenin

4.0

Naringenin is a gentle citrus-derived antioxidant that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

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Antioxidant

Naringin

Naringin

4.0

A gentle citrus antioxidant that helps protect skin from environmental stress and may support a more even tone.

Irritation

low

Source

natural

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Antioxidant

Narirutin

NARIRUTIN

4.0

Narirutin is a gentle citrus-derived antioxidant that helps calm skin and defend against environmental stress, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Nasturtium Extract

TROPAEOLUM MAJUS FLOWER/LEAF/STEM EXTRACT

4.0

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

Irritation

low

Source

natural

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Antioxidant

Nasturtium Leaf Extract

Tropaeolum Majus Leaf Extract

3.8

A gentle botanical extract that may help calm skin and fight free radical damage, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Nasturtium Seed Extract

Tropaeolum Majus Seed Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Nauclea Orientalis Callus Extract

Nauclea Orientalis Callus Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Nectarine Fruit Extract

Prunus Persica Nectarina Fruit Extract

3.8

A gentle, antioxidant-rich fruit extract that may help soothe and hydrate skin, but research on its direct cosmetic benefits is still emerging.

Irritation

low

Source

natural

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Antioxidant

Neocheiropteris Ensata Extract

NEOCHEIROPTERIS ENSATA EXTRACT

3.8

A gentle fern extract with antioxidant potential, but research is still emerging on its specific benefits for skin.

Irritation

low

Source

natural

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Humectant

Neochloris Oleoabundans Extract

Neochloris Oleoabundans Extract

4.0

A gentle, algae-derived ingredient that helps hydrate and protect skin, but research on its specific benefits is still emerging.

Irritation

low

Source

natural

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Antioxidant

Neohesperidin

NEOHESPERIDIN

3.8

Neohesperidin is a citrus-derived antioxidant that may help protect skin from environmental stress and soothe irritation, though research in topical skincare is still emerging.

Irritation

low

Source

natural

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Antioxidant

Neohesperidin Dihydrochalcone

NEOHESPERIDIN DIHYDROCHALCONE

3.8

A potent antioxidant and sweetener that helps protect skin from oxidative stress, but is rarely used as a standalone active in leave-on skincare.

Irritation

low

Source

semi-synthetic

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Antioxidant

Neolepisorus Fortunei Rhizome Extract

Neolepisorus Fortunei Rhizome Extract

3.8

A gentle fern-derived extract with antioxidant potential, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

natural

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Antioxidant

Neolitsea Aciculata Stem Extract

NEOLITSEA ACICULATA STEM EXTRACT

3.8

A gentle, antioxidant-rich 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

Nepalese Geranium Extract

Geranium Nepalense Extract

3.8

A gentle botanical extract with antioxidant potential, but research is limited compared to more common geranium extracts.

Irritation

low

Source

natural

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Antioxidant

Nephrite Extract

NEPHRITE EXTRACT

3.5

Nephrite Extract is a mineral-based ingredient with limited research, but it may offer antioxidant and soothing benefits in skincare formulations.

Irritation

low

Source

natural

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Antioxidant

New Zealand Christmas Tree Extract

Metrosideros Excelsa Flower/Leaf Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

New Zealand Spinach Extract

Tetragonia tetragonoides extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Niacinamide Ascorbate

Niacinamide Ascorbate

4.0

A gentle, stable hybrid of niacinamide and vitamin C that offers antioxidant protection and brightening without the irritation of pure L-ascorbic acid.

Irritation

low

Source

semi-synthetic

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Brightening Agent

Niacinamide Hydroxybenzoate

Niacinamide Hydroxybenzoate

4.0

A gentle, multitasking ingredient that pairs niacinamide’s brightening and barrier-supporting powers with mild exfoliating and soothing properties from hydroxybenzoate.

Irritation

low

Source

semi-synthetic

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Antioxidant

Niacinamide Thioctate

Niacinamide Thioctate

3.8

A promising hybrid antioxidant that combines niacinamide and alpha-lipoic acid, but research is still early.

Irritation

low

Source

semi-synthetic

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Skin conditioning agent

Niacinamide Yeast Ferment

NIACINAMIDE/YEAST POLYPEPTIDE

4.0

A gentle, multi-tasking ingredient that combines niacinamide's brightening and barrier-supporting benefits with yeast peptides for added hydration and skin-smoothing effects.

Irritation

low

Source

semi-synthetic

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Antioxidant

Nicotinoyl Ascorbyl Succinate

Nicotinoyl PEG-4 Ethylascorbyl Succinate

4.3

A stable, dual-action antioxidant that combines vitamin C and niacinamide benefits without the typical irritation or instability of pure L-ascorbic acid.

Irritation

low

Source

semi-synthetic

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Antioxidant

Nicotinoyl PEG-5 Tocopheryl Succinate

NICOTINOYL PEG-5 TOCOPHERYL SUCCINATE

4.0

A gentle, multi-tasking molecule that pairs niacinamide-like benefits with vitamin E’s antioxidant power, but research is still emerging.

Irritation

low

Source

semi-synthetic

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Antioxidant

Nicotinoyl S-Allylcysteine

Nicotinoyl S-Allylcysteine

4.0

A novel synthetic ingredient that pairs niacinamide with a garlic-derived compound for antioxidant and anti-aging effects, but research is still early.

Irritation

low

Source

synthetic

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Antioxidant

Nictoflorin

Nictoflorin

3.8

Nictoflorin is a gentle plant antioxidant that may help calm skin and defend against environmental stress, but research is still early.

Irritation

low

Source

natural

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