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

Anti-Aging Agent

Rice SH-Oligopeptide-1

Rice SH-Oligopeptide-1

4.0

A gentle, rice-derived peptide that may help improve skin firmness and reduce fine lines with regular use.

Irritation

low

Source

biotech

beautyskincarepeptide
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Anti-aging agent

Rice SH-Oligopeptide-2

Rice SH-Oligopeptide-2

3.8

A gentle, bioengineered peptide that may help support skin firmness, but research is still emerging.

Irritation

low

Source

biotech

beautyskincarepeptide
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Anti-aging agent

Rice SH-Polypeptide-1

Rice SH-Polypeptide-1

4.0

A gentle rice-derived peptide that may help improve skin firmness and reduce fine lines, though human studies are still limited.

Irritation

low

Source

biotech

beautyskincarepeptide
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Anti-aging

Rice SH-Polypeptide-3

Rice SH-Polypeptide-3

4.0

A gentle rice-derived peptide that may help improve skin firmness and hydration with low irritation risk.

Irritation

low

Source

natural

beautyskincarepeptide
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Anti-Aging Agent

Rice SH-Polypeptide-9

Rice SH-Polypeptide-9

4.0

A gentle peptide that signals skin to produce more collagen, helping reduce fine lines and improve firmness over time.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
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Skin Conditioning Agent

Rice Sprout Ferment Filtrate

SACCHAROMYCES/RICE SPROUT FERMENT FILTRATE

4.0

A gentle fermented ingredient that may help soothe and brighten skin while supporting its natural barrier.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Rice Triterpenoids

Rice Bran/Germ Triterpenoids

4.0

A gentle, antioxidant-rich ingredient from rice that helps calm skin and support its natural barrier.

Irritation

low

Source

natural

beautyskincareantioxidant
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Foam Booster

Ricinolamide MIPA

RICINOLEAMIDE MIPA

3.5

A mild foam booster and thickener that helps create a rich lather in cleansers, generally well-tolerated but not a primary active ingredient.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Ricinolamidopropyl Betaine

RICINOLEAMIDOPROPYL BETAINE

4.0

A gentle, castor oil-derived surfactant that cleanses effectively with low irritation potential, ideal for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarecleansing
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Conditioning Agent

Ricinolamidopropyl Dimethylamine

RICINOLEAMIDOPROPYL DIMETHYLAMINE

4.0

A gentle, castor-oil-derived conditioning agent that softens hair and skin without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Film Former

Ricinolate Adipate Copolymer

RICINOLEIC ACID/ADIPIC ACID/AEEA COPOLYMER

3.8

A safe, effective film-former that helps makeup and hair products last longer without feeling stiff or heavy.

Irritation

low

Source

synthetic

beautyskincarehaircare
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Foam Booster

Ricinoleamide DEA

RICINOLEAMIDE DEA

3.5

An effective foam booster and thickener, but may cause irritation for sensitive skin and has raised environmental concerns.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Surfactant

Ricinoleamide MEA

Ricinoleamide MEA

3.8

A mild surfactant derived from castor oil that helps create rich lather and thicken cleansers without stripping the skin.

Irritation

low

Source

semi-synthetic

beautyskincaresurfactant
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Emollient

Ricinoleic Acid

RICINOLEIC ACID

4.0

A gentle, plant-derived fatty acid that hydrates and soothes skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Film Former

Ricinoleoyl Epoxy Resin

RICINOLEOYL EPOXY RESIN

3.5

A castor-oil-derived resin that helps makeup and sunscreen stay put longer without feeling heavy.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-former
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Surfactant

Ricinoleth-40

RICINOLETH-40

3.8

Ricinoleth-40 is a gentle emulsifier that helps blend oil and water, but may cause irritation in sensitive skin at high concentrations.

Irritation

moderate

Source

semi-synthetic

beautyskincaresurfactant
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Antistatic Agent

Ricinus-Based Conditioning Agent

RICINOLEAMIDOPROPYLTRIMONIUM METHOSULFATE

4.0

A gentle, castor-oil-derived conditioning ingredient that helps detangle and soften hair without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircare
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Humectant

Rissoella Extract

Rissoella Verruculosa Extract

3.8

A gentle, hydrating algae extract that may help calm skin, but research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing agent

River Bulrush Root Extract

Scirpus Fluviatilis Rhizome Extract

3.8

A gentle plant extract with potential soothing and antioxidant benefits, but research is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical extract
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3.8

RNA is a gentle, hydrating ingredient that may support skin cell turnover, but its benefits in skincare are still being studied.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Robusta Coffee Flower Extract

Coffea Canephora Flower Extract

3.8

A gentle, antioxidant-rich flower 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

Robusta Coffee Fruit Extract

Coffea Robusta Fruit Extract

4.0

A gentle, antioxidant-packed fruit extract that helps protect skin from environmental stress and may support a more even-looking complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Robusta Coffee Seed Extract

Coffea Robusta Seed Extract

4.0

A gentle, antioxidant-rich extract that helps protect skin from environmental stress and may reduce puffiness.

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Robusta Coffee Seed Powder

Coffea Robusta Seed Powder

3.8

A natural physical exfoliant with antioxidant potential, but the gritty texture can be too harsh for sensitive or acne-prone skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Antioxidant

Rock Rose Flower Extract

Helianthemum Nummularium Flower Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Rocky Mountain Juniper Extract

Juniperus Scopulorum Extract

3.8

A gentle, antioxidant-rich botanical extract that may help calm skin and fight free radical damage, though research on its topical benefits is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Rocky Mountain Juniper Oil

JUNIPERUS SCOPULORUM LEAF/STEM OIL

3.5

A fragrant essential oil from Rocky Mountain juniper that adds a woodsy scent and may offer mild antioxidant benefits, but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Rodgersia Root Extract

Rodgersia Podophylla Root Extract

3.5

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing agent

Roman Chamomile Flower Oil

Anthemis Nobilis Flower Oil

4.0

Roman chamomile flower oil is a gentle, fragrant oil that helps calm irritated skin and reduce redness, but it should be used in low concentrations and avoided by those with ragweed allergies.

Irritation

low

Source

natural

beautyskincaresoothing
Read ingredient review

Antioxidant

Rooibos Leaf Extract

Aspalathus Linearis Leaf Extract

4.0

A gentle, antioxidant-rich botanical that helps calm skin and defend against environmental stress without irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rooibos Leaf/Stalk Extract

Aspalathus Linearis Leaf/Stalk Extract

4.2

A gentle, antioxidant-rich botanical extract that helps calm redness and protect skin from daily environmental damage.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Root Extract Complex

Root Extract (multiple species)

3.8

A gentle, antioxidant-rich blend of root extracts that may help calm skin and fight environmental stress, but benefits vary by specific plant source.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rosa Centifolia Ferment Filtrate

Lactobacillus/Rosa Centifolia Flower Ferment Filtrate

4.0

A gentle fermented rose ingredient that may help soothe and protect skin, though research is still emerging.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Rosa Davurica Callus Extract

Rosa Davurica Callus Extract

4.0

A gentle, antioxidant-rich rose 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

Rosa Davurica Leaf Extract

Rosa Davurica Leaf Extract

4.0

A gentle, antioxidant-rich leaf extract that helps protect skin from environmental stress while offering mild soothing benefits.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rosa Duvica Callus Extract

Rosa Duvica Callus Culture Extract

4.0

A gentle, lab-grown rose extract that may help protect skin from environmental stress and support a more resilient complexion.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Rosa Luciae Extract

Rosa Luciae Branch/Flower/Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rosa Multiflora Fruit Extract

Rosa Multiflora Fruit Extract

4.0

A gentle, antioxidant-rich fruit extract that helps protect skin from environmental stress and supports a calm, even-looking complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Rosa Multiflora Seed Oil

Rosa Multiflora Seed Oil

4.0

A gentle, non-greasy seed oil that hydrates and supports skin barrier function with a favorable fatty acid profile.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Rosa Roxburghii Seed Oil

Rosa Roxburghii Seed Oil

4.3

A gentle, antioxidant-rich seed oil that helps nourish and protect the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Soothing agent

Rosa Rugosa Bud Powder

Rosa Rugosa Bud Powder

3.8

A gentle botanical powder that may help calm skin and provide antioxidant protection, but research is limited.

Irritation

low

Source

natural

beautyskincarebotanical
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Soothing Agent

Rosa Rugosa Flower Oil

Rosa Rugosa Flower Oil

4.0

A gentle, fragrant flower oil that may help calm skin and provide antioxidant benefits, but its primary role in many products is scent.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Fragrance

Rosa Rugosa Flower Water

ROSA RUGOSA FLOWER WATER

3.8

A gentle, lightly astringent floral water that can refresh and soothe skin, but its benefits are mostly anecdotal and it may cause sensitivity in those allergic to roses.

Irritation

low

Source

natural

beautyskincaretonerfragrance
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Antioxidant

Rosa Rugosa Fruit Extract

Rosa Rugosa Fruit Extract

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rosa Rugosa Leaf Extract

Rosa Rugosa 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

Rosa Rugosa Root Extract

Rosa Rugosa Root Extract

3.8

A gentle, plant-based antioxidant that may help calm skin and defend against environmental stress, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rosa Rugosa Stem Extract

Rosa Rugosa Stem Extract

4.0

A gentle, antioxidant-rich plant extract that may help calm skin and defend against environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rose Bracteata Extract

Rosa Bracteata 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
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Soothing Agent

Rose Bud Extract

Rosa Damascena Bud Extract

4.0

A gentle, fragrant rose extract that helps calm skin and fight free radicals, but its benefits are mostly from its antioxidant and soothing compounds rather than dramatic anti-aging effects.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Rose Callus Culture Extract

Rosa Hybrid Callus Culture Extract

4.0

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

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Rose Callus Extract

Rosa Gallica Callus Extract

4.0

A gentle, antioxidant-rich rose extract that may help soothe skin and fight free radical damage, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rose Callus Powder

Rosa Gallica Callus Powder

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Rose Canina Flower Extract

Rosa Canina Flower Extract

4.0

A gentle, antioxidant-rich flower extract that helps calm skin and protect against environmental stress without clogging pores.

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Rose Canina Flower Powder

Rosa Canina Flower Powder

3.8

A gentle botanical powder that provides mild physical exfoliation and may offer antioxidant benefits, but research on its specific skincare effects is limited.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing Agent

Rose Centifolia Bud Extract

Rosa Centifolia Bud Extract

4.0

A mild, fragrant rose extract that helps calm skin and fight free radicals, but its benefits are subtle and not as potent as some other antioxidants.

Irritation

low

Source

natural

beautyskincarebotanical
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Fragrance

Rose Centifolia Flower Oil

Rosa Centifolia Flower Oil

4.0

A fragrant, soothing oil with antioxidant benefits, but can be irritating for sensitive skin due to its natural fragrance compounds.

Irritation

moderate

Source

natural

beautyskincarefragrance
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