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

Fragrance

Ravensara Aromatica Twig Oil

RAVENSARA AROMATICA TWIG OIL

3.8

Ravensara Aromatica Twig Oil adds a pleasant scent and may offer mild skin-soothing benefits, but it can be irritating for sensitive skin and is best used in low concentrations.

Irritation

moderate

Source

natural

beautyskincareessential oil
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Fragrance

Ravensara Leaf Oil

RAVENSARA AROMATICA LEAF OIL

3.8

Ravensara leaf oil adds a pleasant scent and may offer mild soothing benefits, but it can be irritating for sensitive skin and is best used in low concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance component

Ravensara Twig Extract

RAVENSARA AROMATICA TWIG EXTRACT

3.5

A fragrant botanical extract with limited research; may offer soothing benefits but can be irritating for sensitive skin.

Irritation

moderate

Source

natural

beautyskincarebotanical extract
Read ingredient review

Binding Agent

Rayon

Rayon

2.5

Rayon is a semi-synthetic fiber used as a binder in powders and masks, but it offers no direct skin benefit and may raise environmental concerns.

Irritation

low

Source

semi-synthetic

beautyskincarebinding agent
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Antioxidant

Rebaudioside A

REBAUDIOSIDE A

3.8

A gentle, plant-derived antioxidant that may help calm skin and fight free radicals, but its skincare benefits are still being studied.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin-conditioning agent

Recombinant Polypeptide-47

TRANSGENIC NEMATODE RH-POLYPEPTIDE-47

3.5

A biotech-derived peptide that may help support skin firmness, but human research is still limited.

Irritation

low

Source

biotech

beautyskincareanti-aging
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Antioxidant

Recombinant Synechococcus Polypeptide-1

R-SYNECHOCOCCUS POLYPEPTIDE-1

4.0

A lab-made peptide from a marine microbe that may help protect skin from environmental stress and support a more even tone, though human studies are limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Antioxidant

Recombinant Thioredoxin-1

R-Escherichia Coli Thioredoxin-1

3.8

A biotech antioxidant that may help shield skin from pollution and UV stress, but human skincare research is still limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Fragrance

Rectified Camphor Leaf Oil

Cinnamomum Camphora Formosana Leaf Oil Rectified

3.8

Camphor leaf oil can provide a cooling sensation and mild antimicrobial benefits, but it is a potent essential oil that may irritate sensitive skin and should be used in low concentrations.

Irritation

moderate

Source

natural

beautyskincareessential oil
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Colorant

Red 22 Lake

CI 45380

3.5

A common synthetic red dye in makeup, generally safe for most people but may cause irritation in sensitive skin or eyes.

Irritation

low

Source

synthetic

beautycolorant
Read ingredient review

Colorant

Red 27 Lake

CI 45410

3.5

A safe, widely used synthetic pigment that adds vibrant red color to makeup but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 30 Lake

CI 73385

3.5

A safe, widely used synthetic red pigment that adds vibrant color to makeup but offers no skincare benefits.

Irritation

low

Source

synthetic

beautycosmeticscolorant
Read ingredient review

Colorant

Red 33

CI 17200

3.5

A widely used synthetic red dye that is generally safe in cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 33 (CI 12420)

CI 12420

3.5

A widely used synthetic dye that adds vibrant red color to cosmetics, generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 33 Lake

CI 15525

3.5

A widely used synthetic colorant that adds vibrant red shades to makeup but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 4

CI 14815

3.5

CI 14815 is a synthetic red dye that adds vibrant color to cosmetics, but it offers no skincare benefits and may cause allergic reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 4 (CI 15800)

CI 15800

3.5

A widely used synthetic red pigment that adds color to makeup but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 4 (CI 16255)

CI 16255

3.0

A common synthetic red dye that adds color to cosmetics but offers no skincare benefits; generally safe for most people but may cause reactions in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 40

CI 16035

3.5

A widely used synthetic red dye that adds color to cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 6 (CI 15880)

CI 15880

3.5

A widely used synthetic red pigment that is generally safe in cosmetics but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarecolorant
Read ingredient review

Colorant

Red 7 Lake

CI 15850

3.5

A widely used synthetic red pigment that adds vibrant color to makeup, generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautycosmeticscolorant
Read ingredient review

Colorant

Red 88

Pigment Red 88 (CI 73312)

3.5

A stable, vivid red pigment approved for cosmetic use in many regions, but with limited safety data compared to more common colorants.

Irritation

low

Source

synthetic

beautycosmeticscolorant
Read ingredient review

Humectant

Red Algae Callus Extract

Botryocladia Adhaerens Callus Extract

4.0

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

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Red Algae Complex Extract

Hydrolyzed Gelidium Elegans/Gracilaria Vermiculophylla/Gracilaria Gigas/Pterocladiella Capillacea/Ahnfeltia Plicata Extract

4.0

A gentle, multi-species red algae extract that helps hydrate and soothe skin while forming a light protective film.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Red Algae Extract

RHODOSORUS MARINUS EXTRACT

4.0

A gentle, hydrating algae extract that helps skin retain moisture and may calm irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Red Algae Extract Blend

Gigartina stellata/Kappaphycus alvarezii Extract

4.0

A gentle, hydrating seaweed extract that helps soothe skin and support moisture retention without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Soothing agent

Red Algae Ferment Filtrate

PORPHYRIDIUM CRUENTUM CULTURE CONDITIONED MEDIA

4.0

A gentle, fermented red algae ingredient that supports skin hydration and calmness without irritation.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Humectant

Red Algae Powder

Porphyra Umbilicalis Powder

4.0

A gentle, ocean-derived powder that helps hydrate and calm the skin, making it a good choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Film Former

Red Algae Protein

Gelidium Pulchrum Protein

3.8

A gentle, plant-based protein that helps form a light film on skin to lock in moisture and improve texture.

Irritation

low

Source

natural

beautyskincarefilm-former
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Antioxidant

Red Belted Polypore Extract

Phellinus Ribis Extract

3.8

A mushroom extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Red Clover Juice

TRIFOLIUM PRATENSE FLOWER/LEAF/STEM JUICE

3.8

Red Clover Juice is a gentle, antioxidant-rich botanical that may help soothe skin and protect against environmental stress, but research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Red Clover Leaf Extract

Trifolium Pratense Leaf Extract

4.0

Red Clover Leaf Extract is a gentle botanical antioxidant that may help calm skin and protect against environmental stress, though research on its topical benefits is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Red Clover Seed Extract

TRIFOLIUM PRATENSE SEED EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Red Clover Symbiosome Extract

Trifolium Pratense Symbiosome Extract

4.0

A lab-grown red clover extract that may help calm skin and fight free radicals, but human studies are still limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Humectant

Red Clover Water

TRIFOLIUM PRATENSE FLOWER/LEAF/STEM WATER

4.0

A mild, plant-based water that provides light hydration and soothing benefits, ideal for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Antioxidant

Red Currant Callus Extract

RIBES RUBRUM CALLUS 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
Read ingredient review

Antioxidant

Red Currant Callus Powder

RIBES RUBRUM CALLUS POWDER

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Red Currant Fruit Extract

RIBES RUBRUM FRUIT EXTRACT

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Red Currant Fruit Water

RIBES RUBRUM FRUIT WATER

3.8

Red Currant Fruit Water is a gentle, antioxidant-rich ingredient that adds a touch of hydration and skin-soothing benefits, but its effects are mild and best as part of a broader formula.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Humectant

Red Hot Poker Nectar

KNIPHOFIA UVARIA NECTAR

3.8

A gentle, plant-derived humectant that helps hydrate and calm the skin, though research on its benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Colorant

Red Iron Oxide

CI 77015

4.0

A safe, natural mineral pigment that gives red and pink hues to makeup without common irritation.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Skin conditioning

Red Junglefowl Stem Cell Culture

RED JUNGLEFOWL BLASTODERM PLURIPOTENT CELL CULTURE CONDITIONED MEDIA

3.5

A novel biotech ingredient from bird stem cells that may support skin repair, but human research is very limited.

Irritation

low

Source

biotech

beautyskincareactive
Read ingredient review

Antioxidant

Red Kangaroo Paw Flower Extract

Anigozanthos Manglesii Flower Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing agent

Red Lily Bulb Extract

Lilium Speciosum Rubrum Bulb Extract

3.8

A gentle botanical extract that may help calm irritation and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Red Mangrove Callus Extract

Rhizophora Mangle Callus Culture Extract

4.0

A gentle, lab-grown antioxidant extract that may help calm skin and fight environmental stress, though research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Exfoliant

Red Maple Bark Powder

Acer Rubrum Bark Powder

3.8

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

Irritation

low

Source

natural

beautyskincareexfoliant
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Antioxidant

Red Osier Dogwood Extract

CORNUS STOLONIFERA LEAF/STEM EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Red Pepper Callus Extract

Capsicum Annuum Callus Culture Extract

3.8

A gentle, antioxidant-rich plant extract from red pepper cells that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Red Pepper Ferment Filtrate

LACTOBACILLUS/CAPSICUM ANNUUM FRUIT FERMENT FILTRATE

3.8

A fermented red pepper extract that may provide antioxidant support, but research is limited and it may not suit very sensitive skin.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Antioxidant

Red Pepper Fruit Extract

Capsicum Annuum Fruit Extract

3.5

A plant extract that can boost circulation and provide antioxidants, but may cause stinging or irritation for sensitive skin.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Antioxidant

Red Pepper Fruit Juice

Capsicum Annuum Fruit Juice

3.5

A natural fruit juice with antioxidant potential, but may cause irritation for sensitive skin due to natural capsaicin traces.

Irritation

moderate

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Red Pepper Fruit Meristem Cell

Capsicum Annuum Fruit Meristem Cell

3.8

A gentle plant stem cell extract that may help protect skin from environmental stress, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Occlusive

Red Petrolatum

Petrolatum (and) CI 15850

3.8

Red Petrolatum is a tinted occlusive that locks in moisture and adds a pop of color, but may clog pores for some skin types.

Irritation

low

Source

semi-synthetic

beautyskincareocclusive
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