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

Quercetagetin

Quercetagetin

4.0

Quercetagetin is a gentle antioxidant that helps protect skin from environmental stress, but research on its cosmetic benefits is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Quercetin

QUERCETIN

4.0

Quercetin is a potent plant antioxidant that helps defend skin against pollution and UV damage while supporting a calmer, more even complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Quercetin Caprylate

Quercetin Caprylate

4.0

A stabilized, oil-friendly version of quercetin that offers antioxidant protection with better skin absorption.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Exfoliant

Quercus Acutissima Fruit Powder

Quercus Acutissima Fruit Powder

3.8

A gentle, natural exfoliating powder from oak fruit, best for those seeking mild physical exfoliation with antioxidant benefits.

Irritation

low

Source

natural

beautyskincareexfoliant
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Antioxidant

Quercus Glauca Seed Extract

Quercus Glauca Seed Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Quercus Glauca Stem Extract

QUERCUS GLAUCA STEM 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
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Antioxidant

Quercus semecarpifolia Bark Extract

QUERCUS SEMECARPIFOLIA BARK EXTRACT

3.8

A gentle, antioxidant-rich bark 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

Quercus Serrata Extract

Quercus Serrata Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Quercus Serrata Seed Extract

Quercus Serrata Seed Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Surfactant

Quillaja Bark Extract

Quillaja Saponaria Bark Extract

4.0

A gentle, plant-derived surfactant that creates a mild foam and cleanses without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincarecleansing agent
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Antioxidant

Quince Flower Extract

Pyrus Cydonia Flower Extract

3.8

Quince flower extract is a mild botanical with antioxidant potential, but research is limited and it's mainly used as a gentle skin conditioner.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Quince Fruit Extract

Pyrus Cydonia Fruit Extract

4.0

A gentle fruit extract that may help protect skin from environmental stress and provide light hydration.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Quince Fruit Juice

Pyrus Cydonia Fruit Juice

3.8

Quince fruit juice is a gentle, hydrating ingredient with antioxidant properties, but research on its skincare benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Quince Fruit Water

Cydonia Oblonga Fruit Water

4.0

Quince fruit water is a mild, hydrating botanical water that can soothe and lightly moisturize skin, but it lacks strong clinical evidence for dramatic effects.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Emollient

Quince Peel/Fruit Wax

Pyrus Cydonia Peel/Fruit Wax

4.0

A gentle, plant-derived wax that helps lock in moisture and create a smooth, protective layer on skin.

Irritation

low

Source

natural

beautyskincareemollient
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Humectant

Quince Seed Extract

Pyrus Cydonia Seed Extract

4.0

A gentle, plant-based hydrator that forms a light, soothing film on the skin to help lock in moisture.

Irritation

low

Source

natural

beautyskincarehumectant
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Emollient

Quince Seed Oil

Pyrus Cydonia Seed Oil

4.0

Quince seed oil is a gentle, nutrient-rich emollient that hydrates and softens skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Exfoliant

Quinic Acid

Quinic Acid

4.0

A gentle, plant-derived AHA that exfoliates and hydrates without the sting of stronger acids, making it a good option for sensitive skin.

Irritation

low

Source

natural

beautyskincareexfoliant
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Antimicrobial

Quinine

QUININE

3.5

Quinine can help calm inflammation and fight microbes, but it may irritate sensitive skin and is not a proven anti-aging ingredient.

Irritation

moderate

Source

natural

beautyskincareantimicrobial
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Humectant

Quinoa Ferment Filtrate

LACTOBACILLUS/QUINOA FERMENT EXTRACT FILTRATE

4.0

A gentle, probiotic-derived ingredient that may help strengthen the skin barrier and improve hydration, though research is still emerging.

Irritation

low

Source

biotech

beautyskincarehumectant
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Antioxidant

Quinoa Flower/Leaf Extract

Chenopodium Quinoa Flower/Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Quinoa Husk Extract

Chenopodium Quinoa Husk Extract

4.0

A gentle, plant-based extract that may help calm irritation and defend against environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Quinoa Husk Powder

Chenopodium Quinoa Husk Powder

3.8

A gentle, natural exfoliant from quinoa husks that buffs away dead skin without harsh microbeads.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing agent

Quinoa Seed Extract

Chenopodium Quinoa Seed Extract

4.0

Quinoa Seed Extract is a gentle, plant-based ingredient that helps soothe and hydrate the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Emollient

Quinoa Seed Oil

Chenopodium Quinoa Seed Oil

4.0

Quinoa seed oil is a gentle, nutrient-dense emollient that helps soften and protect the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Quinoa Seed Oil Ethyl Esters

Chenopodium Quinoa Seed Oil Ethyl Esters

4.0

A lightweight, plant-derived emollient that hydrates without clogging pores, ideal for sensitive and oily skin types.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Soothing Agent

Quinoa Seedcake Extract

Chenopodium Quinoa Seedcake Extract

4.0

Quinoa Seedcake Extract is a gentle, plant-based ingredient that helps calm and condition the skin, though research on its specific benefits is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Anti-aging agent

Quinoyl Tripeptide-1

Quinoyl Tripeptide-1

4.0

A synthetic peptide that may help support skin firmness and reduce fine lines, but more human studies are needed to confirm its effects.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Anti-aging agent

Quinoyl Tripeptide-35

Quinoyl Tripeptide-35

3.8

A synthetic peptide that may help improve skin firmness and smooth fine lines, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Anti-aging agent

Quinoyl Tripeptide-7

Quinoyl Tripeptide-7

4.0

A synthetic peptide that may help firm skin and soften wrinkles, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Anti-aging agent

R-Bovine Octapeptide-1

R-Bovine Octapeptide-1

3.5

A synthetic peptide that may help reduce the look of fine lines, but research is limited and mostly based on similar peptides.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Skin conditioning agent

R-Bovine Oligopeptide-1

R-Bovine Oligopeptide-1

4.0

A lab-made peptide that may help firm and repair skin, but human studies are limited and it's not a medical treatment.

Irritation

low

Source

biotech

beautyskincarepeptide
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Skin conditioning agent

R-Leucosporidium Polypeptide-1

R-Leucosporidium Polypeptide-1

3.8

A novel yeast-derived peptide that may help improve skin firmness, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

biotech

beautyskincarepeptide
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Humectant

R-Saccharomyces Polypeptide-1

R-SACCHAROMYCES POLYPEPTIDE-1

4.0

A gentle, yeast-derived peptide that helps hydrate and support the skin barrier, but research is still emerging.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Anti-aging agent

R-Salmon Oligopeptide-1

R-Salmon Oligopeptide-1

3.8

A promising but under-researched peptide that may support collagen and skin repair, but lacks robust human studies.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
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Skin conditioning agent

R-Spider Polypeptide-3

R-Spider Polypeptide-3

3.5

A synthetic peptide that may help firm and smooth skin, but research is still early and benefits are not guaranteed.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Preservative Booster

Radish Root Ferment Filtrate

Leuconostoc/Radish Root Ferment Filtrate

4.0

A gentle, naturally derived preservative booster that helps keep your products fresh while offering mild skin-conditioning benefits.

Irritation

low

Source

natural

beautyskincarepreservative
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Emollient

Radish Seed Oil

RAPHANUS SATIVUS SEED OIL

4.0

A lightweight, non-comedogenic oil that hydrates and softens skin without feeling heavy, suitable for most skin types.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Radish Sprout Extract

RAPHANUS SATIVUS SPROUT EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Radish Sprout Powder

RAPHANUS SATIVUS SPROUT POWDER

3.8

Radish sprout powder is a gentle, antioxidant-rich ingredient that may help calm skin and protect against environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Raffinose

RAFFINOSE

4.0

Raffinose is a gentle, plant-derived sugar that hydrates the skin and feeds beneficial bacteria, making it a smart choice for sensitive or microbiome-focused routines.

Irritation

low

Source

natural

beautyskincarehumectant
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Emulsifier

Raffinose Isostearate

RAFFINOSE ISOSTEARATE

4.0

A mild, sugar-based emulsifier that helps blend water and oil in skincare products while offering gentle skin conditioning.

Irritation

low

Source

semi-synthetic

beautyskincareemulsifier
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Emollient

Raffinose Myristate

RAFFINOSE MYRISTATE

4.0

Raffinose Myristate is a mild, sugar-based emollient that hydrates and conditions skin without clogging pores, making it a good option for sensitive or acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
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Humectant

Raffinose Oleate

RAFFINOSE OLEATE

4.0

Raffinose Oleate is a gentle, sugar-based ingredient that hydrates and soothes the skin, making it a promising option for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantemollient
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Anti-aging agent

Rainbow Trout Oligopeptide Complex

SR-RAINBOW TROUT OLIGOPEPTIDE-1 SH-OLIGOPEPTIDE-2

3.5

A novel peptide complex from fish sources that may support skin firmness and repair, but human research is very limited.

Irritation

low

Source

natural

beautyskincareanti-aging
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Anti-Aging Agent

Rainbow Trout Oligopeptide-1

SR-RAINBOW TROUT OLIGOPEPTIDE-1 SH-POLYPEPTIDE-9

3.5

A novel peptide from fish that may support skin firmness and repair, but human research is very limited.

Irritation

low

Source

natural

beautyskincarepeptide
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Antioxidant

Ramaria Formosa Extract

RAMARIA FORMOSA FRUITING BODY EXTRACT

3.8

A mushroom-derived extract with antioxidant potential, but research is limited and it is not a proven skincare powerhouse.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rambutan Extract

Nephelium lappaceum branch/fruit/leaf extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing Agent

Ransou Extract

RANSOU EKISU

3.8

Ransou Extract is a gentle, plant-based ingredient that may help calm and hydrate the skin, though scientific research is still limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Antioxidant

Raoulia Australis Callus Extract

Raoulia Australis Callus Extract

3.8

A gentle, antioxidant-rich plant extract from New Zealand that may help calm skin and fight free radicals, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing agent

Raoulia Australis Shoot Extract

Raoulia Australis Shoot Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Rapeseed Extract

Brassica Napus Seed Extract

4.0

A gentle, plant-based antioxidant extract that helps soothe and condition the skin without common irritants.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin conditioner

Rapeseed Ferment Extract

CANDIDA BOMBICOLA/GLUCOSE/METHYL RAPESEEDATE FERMENT

4.0

A gentle, biotech-derived emollient that helps soften and condition skin without clogging pores.

Irritation

low

Source

biotech

beautyskincareemollient
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