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

Kushenol / Kurarinone Complex

Sophora Flavescens Root Extract

4.0

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

Irritation

low

Source

natural

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Antioxidant

Kwao Krua Callus Extract

Pueraria Mirifica Callus Culture Extract

4.0

A lab-grown plant extract that may help support skin firmness and radiance, but human research is still limited.

Irritation

low

Source

biotech

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Antioxidant

Kwao Krua Root Extract

Pueraria Mirifica Root Extract

3.8

A plant-based ingredient with phytoestrogens that may support skin firmness and elasticity, but human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Kwao Krua Root Ferment Filtrate

Pueraria Mirifica Root Powder/Propylene Glycol Ferment Filtrate

3.8

A fermented botanical extract with promising antioxidant properties, but research is still early and benefits are not yet well-established.

Irritation

low

Source

natural

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Antioxidant

Kyounin Extract

KYOUNIN EKISU

3.8

A gentle herbal extract with antioxidant potential, but research is limited and benefits are not well-documented in Western skincare.

Irritation

low

Source

natural

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Antioxidant

Kyounin Yu

Kyounin Yu

3.8

Kyounin Yu is a gentle herbal extract with antioxidant and soothing potential, but scientific evidence is limited.

Irritation

low

Source

natural

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Antioxidant

Labisia Pumila Extract

Labisia Pumila Leaf/Root Extract

3.5

A traditional botanical extract with antioxidant potential, but limited modern research to confirm its benefits in skincare.

Irritation

low

Source

natural

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Antioxidant

Lactobacillus Olive Leaf Ferment

LACTOBACILLUS/OLEA EUROPAEA LEAF FERMENT EXTRACT

4.0

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

Irritation

low

Source

biotech

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Antioxidant

Lactobacillus Sarcodia Ferment

LACTOBACILLUS/SARCODIA MONTAGNEANA EXTRACT FERMENT

3.8

A fermented botanical extract that may help balance skin bacteria and provide antioxidant benefits, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Lactobacillus/Clover Flower Ferment

Lactobacillus/Clover Flower Ferment Extract

4.0

A gentle fermented ingredient that may help soothe and protect skin, though research is still limited compared to more established actives.

Irritation

low

Source

biotech

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Antioxidant

Lactobacillus/Plum Blossom Ferment

LACTOBACILLUS/PRUNUS MUME FLOWER EXTRACT FERMENT FILTRATE

4.0

A gentle fermented botanical extract that may help soothe and protect the skin, though research is still emerging.

Irritation

low

Source

biotech

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Skin conditioning agent

Lactobacillus/Sorbus Ferment Filtrate

LACTOBACILLUS/SORBUS COMMIXTA BRANCH FERMENT FILTRATE

4.0

A gentle, fermented botanical ingredient that may help soothe and protect the skin, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Lactobacillus/Turmeric Ferment Filtrate

Lactobacillus/Turmeric Ferment Filtrate

4.0

A fermented turmeric extract that offers antioxidant protection and soothing benefits with potentially better skin absorption than plain turmeric.

Irritation

low

Source

biotech

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Antioxidant

Lactoferrin

Lactoferrin

4.0

Lactoferrin is a gentle, milk-derived protein that helps calm skin and fight environmental stress without irritation.

Irritation

low

Source

natural

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Antioxidant

Lactoflavin

Lactoflavin

4.0

Lactoflavin (vitamin B2) is a gentle antioxidant that helps protect skin from environmental stress and supports a healthy complexion.

Irritation

low

Source

natural

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Antioxidant

Lady Palm Leaf Extract

Rhapis Flabelliformis Leaf Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Lady Slipper Orchid Extract

Paphiopedilum Maudiae Flower Extract

3.5

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

Irritation

low

Source

natural

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Antioxidant

Lady's Mantle Extract

Alchemilla Vulgaris Flower/Leaf/Stem Extract

4.0

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

Irritation

low

Source

natural

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Humectant

Laminaria Cloustoni Extract

Laminaria Cloustoni Extract

4.0

A gentle, mineral-rich seaweed extract that helps hydrate and calm the skin without clogging pores.

Irritation

low

Source

natural

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Humectant

Laminaria Hyperborea Extract

Laminaria Hyperborea Extract

4.0

A nutrient-rich seaweed extract that hydrates, soothes, and protects the skin with antioxidants, ideal for dry or sensitive skin types.

Irritation

low

Source

natural

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Humectant

Laminaria Japonica Powder

Laminaria Japonica Powder

4.0

A gentle seaweed powder that helps hydrate and calm the skin while providing antioxidant protection.

Irritation

low

Source

natural

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Humectant

Laminaria Longissima Extract

Laminaria Longissima Extract

4.0

A gentle, mineral-rich seaweed extract that hydrates and soothes the skin, ideal for sensitive or dry types.

Irritation

low

Source

natural

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Humectant

Laminaria Ochotensis Extract

Laminaria Ochotensis Extract

4.0

A gentle seaweed extract that hydrates and soothes skin, but its benefits are mostly backed by traditional use and limited clinical studies.

Irritation

low

Source

natural

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Humectant

Laminaria Ochroleuca Extract

Laminaria Ochroleuca Extract

4.0

A gentle, mineral-rich seaweed extract that hydrates and soothes skin, ideal for sensitive or dry types.

Irritation

low

Source

natural

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Humectant

Laminaria Saccharina Extract

Laminaria Saccharina Extract

4.0

A gentle, nutrient-rich seaweed extract that hydrates and soothes the skin, with antioxidant benefits to help protect against environmental stress.

Irritation

low

Source

natural

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Antioxidant

Lanceleaf Plantain Meristem Cell

PLANTAGO LANCEOLATA MERISTEM CELL

3.8

A gentle, plant-derived ingredient that may help protect skin from environmental stress and support a calmer complexion, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Lannea Coromandelica Bark Extract

LANNEA COROMANDELICA 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

Lansium Domesticum Pericarp Extract

Lansium Domesticum Pericarp Extract

3.8

A gentle, antioxidant-rich plant extract that may help protect skin from environmental stress, though human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Lantana Camara Extract

LANTANA CAMARA FLOWER/LEAF/STEM EXTRACT

3.5

Lantana camara extract offers antioxidant benefits but is less studied than other plant extracts and may cause irritation in sensitive skin.

Irritation

moderate

Source

natural

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Antioxidant

Lapachone

Lapachone

3.5

Lapachone is a natural antioxidant that may help protect skin from environmental stress, but research in cosmetics is still limited.

Irritation

low

Source

natural

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Antioxidant

Larch Bark Extract

Larix Leptolepis Bark Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Larch Flower Extract

Larix Decidua Flower 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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Antioxidant

Larch Leaf Cell Extract

Larix Decidua Leaf Cell Extract

3.8

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

Irritation

low

Source

biotech

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Antioxidant

Larch Root Bark Extract

Larix Kaempferi Root Bark Extract

3.8

A gentle, plant-derived antioxidant that may help calm skin and fight environmental stress, though research is still limited.

Irritation

low

Source

natural

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Antioxidant

Larch Wood Extract

Larix Leptolepis Wood Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Large-Leaf Dogwood Leaf Extract

CORNUS MACROPHYLLA LEAF EXTRACT

3.8

A gentle plant extract with antioxidant potential, but research is still early — it's a nice-to-have rather than a must-have ingredient.

Irritation

low

Source

natural

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Antioxidant

Larrea Divaricata Leaf Extract

LARREA DIVARICATA LEAF EXTRACT

3.8

A plant-based antioxidant that may help protect skin from environmental stress, but research is still early and some related species have raised safety concerns.

Irritation

low

Source

natural

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Antioxidant

Larrea Mexicana Extract

LARREA MEXICANA EXTRACT

3.8

A plant extract with antioxidant potential, but limited human studies and a history of oral safety concerns mean it's best used cautiously in low concentrations.

Irritation

low

Source

natural

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Antioxidant

Lathyrus Japonicus Extract

LATHYRUS JAPONICUS EXTRACT

3.8

A gentle, plant-based antioxidant that may help shield skin from pollution and UV damage, though human studies are limited.

Irritation

low

Source

natural

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Antioxidant

Laudanosine

LAUDANOSINE

2.5

Laudanosine is a rare plant alkaloid with theoretical antioxidant benefits, but it lacks robust safety and efficacy data for cosmetic use.

Irritation

moderate

Source

natural

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Antioxidant

Lauryl Glyceryl Ascorbate

Lauryl 3-Glyceryl Ascorbate

4.0

A gentle, oil-soluble vitamin C derivative that brightens skin and fights free radicals with less sting than pure L-ascorbic acid.

Irritation

low

Source

semi-synthetic

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Antioxidant

Lauryl/Tridecyl Glyceryl Ascorbate

3-LAURYL/TRIDECYLGLYCERYL ASCORBATE

4.3

A gentle, fat-soluble 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

Lavender Callus Extract

LAVANDULA ANGUSTIFOLIA CALLUS EXTRACT

3.8

A gentle, lab-grown lavender extract that may help protect skin from environmental stress, though research is still early.

Irritation

low

Source

biotech

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Antioxidant

Lavender Lace Flower Extract

Odontioda Lavender Lace Flower Extract

3.5

A gentle, antioxidant-rich orchid extract that may help calm skin and fight free radicals, but research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Lavender Leaf Cell Extract

LAVANDULA ANGUSTIFOLIA LEAF CELL EXTRACT

3.8

A gentle, lab-grown lavender extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

biotech

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Antioxidant

Lavender Phytoplacenta Extract

Lavandula Angustifolia Phytoplacenta Extract

4.0

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

Irritation

low

Source

biotech

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Antioxidant

Leaf Extract Complex

Leaf Extract (multiple species)

3.8

A gentle, antioxidant-rich blend that may help calm skin and fight free radicals, but benefits vary widely by plant source.

Irritation

low

Source

natural

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Antioxidant

Leather Coral Extract

Sarcophyton Glaucum Extract

3.5

Leather Coral Extract is a marine antioxidant that may help soothe skin and fight free radicals, but research is limited.

Irritation

low

Source

natural

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Antioxidant

Ledebouriella Root Callus Extract

LEDEBOURIELLA SESELOIDES CALLUS CULTURE EXTRACT

4.0

A gentle, lab-grown root extract that may help calm irritation and defend against environmental stress, though human studies are limited.

Irritation

low

Source

biotech

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Antioxidant

Leek Extract

ALLIUM PORRUM EXTRACT

3.8

Leek extract offers antioxidant benefits and mild soothing effects, but research on its cosmetic use is still emerging.

Irritation

low

Source

natural

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Antioxidant

Lemon & Serrated Wrack Extract

Citrus Limon (Lemon) Fruit Extract / Fucus Serratus Extract

3.8

A gentle botanical blend that pairs lemon's antioxidant power with seaweed's soothing hydration, but the research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Lemon Balm Extract

MELISSA OFFICINALIS FLOWER/LEAF/STEM EXTRACT

4.0

Lemon balm extract is a gentle, antioxidant-rich botanical that helps calm skin and fight free radical damage, but its benefits are best supported by traditional use and lab studies rather than large human trials.

Irritation

low

Source

natural

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Antioxidant

Lemon Balm Meristem Cell Culture

Melissa Officinalis Meristem Cell Culture

4.0

A gentle, lab-grown plant cell extract that may help protect skin from environmental stress and calm irritation.

Irritation

low

Source

biotech

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Antioxidant

Lemon Bud Extract

Citrus Limon Bud Extract

3.8

A gentle plant-based antioxidant from lemon buds that may help protect skin from environmental stress, but research is limited and it can cause irritation in sensitive individuals.

Irritation

moderate

Source

natural

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