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

Renealmia Leaf Extract

Renealmia Guianensis Leaf Extract

3.5

A gentle, plant-derived extract with emerging research suggesting antioxidant and soothing benefits, but more studies are needed to confirm its efficacy in skincare.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Repagermanium

Repagermanium

2.5

Repagermanium is a synthetic germanium compound with limited evidence for skin benefits; its use in cosmetics is rare and not well-supported by robust research.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resacetophenone

Resacetophenone

3.8

Resacetophenone is a synthetic antioxidant that helps stabilize formulas and protect skin from environmental stress.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Exfoliant

Resorcinol

Resorcinol

3.5

Resorcinol is an effective exfoliant and antiseptic for acne and dark spots, but it can be irritating and is not suitable for sensitive skin or during pregnancy.

Irritation

moderate

Source

synthetic

beautyskincareexfoliant
Read ingredient review

Exfoliant

Resorcinol Acetate

RESORCINOL ACETATE

3.8

A milder cousin of resorcinol that helps fade dark spots and smooth skin texture, but can still cause irritation in sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareexfoliant
Read ingredient review

Skin lightening agent

Resorcinol Bis-Ethylhexanoate

RESORCINOL BIS-ETHYLHEXANOATE

3.8

A synthetic brightener that helps fade dark spots and even skin tone with low irritation risk.

Irritation

low

Source

synthetic

beautyskincarebrightening agent
Read ingredient review

Antioxidant

Resorcinol Dihexyl Ether

RESORCINOL DIHEXYL ETHER

3.8

A synthetic antioxidant that may help brighten skin and even out tone, but research is still limited compared to more established ingredients.

Irritation

low

Source

synthetic

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Resorcinol Dimethyl Ether

Resorcinol Dimethyl Ether

3.5

A synthetic fragrance ingredient with a pleasant, sweet, clove-like scent; generally considered safe at low concentrations but offers no direct skincare benefit.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Skin-lightening agent

Resorcinol Dipentyl Ether

RESORCINOL DIPENTYL ETHER

3.5

A synthetic brightener that targets dark spots, but may cause irritation for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareskin-lightening agent
Read ingredient review

Soothing Agent

Restharrow Root Extract

Ononis Arvensis Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Antioxidant

Resveratrol

Resveratrol

4.2

Resveratrol is a potent antioxidant that helps defend skin from oxidative stress, but its benefits are best supported when combined with other antioxidants and used consistently over time.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratrol Dimethyl Ether Oligosaccharides

Resveratrol Dimethyl Ether Oligosaccharides

4.0

A stabilized, sugar-bound form of resveratrol that offers antioxidant protection with potentially better skin penetration and less irritation than plain resveratrol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratrol Tributyl Ether

Resveratrol Tributyl Ether

4.0

A stabilized version of resveratrol that may help protect skin from environmental stress, though human studies are still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratrol Tripentyl Ether

RESVERATROL TRIPENTYL ETHER

4.0

A more stable, oil-friendly version of resveratrol that helps protect skin from environmental stress without the formulation challenges of plain resveratrol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratryl Acetate

Resveratryl Acetate

4.0

A gentle, stabilized version of resveratrol that offers antioxidant protection and helps calm the skin without the stability issues of natural resveratrol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratryl Ferulate

Resveratryl Ferulate

4.3

A potent antioxidant that pairs two well-known plant compounds for better stability and skin protection.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratryl Glucoside

Resveratryl Glucoside

4.3

A gentle, water-friendly antioxidant that helps protect skin from environmental stress without the stability issues of plain resveratrol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratryl Triacetate

Resveratryl Triacetate

4.0

A more stable, oil-friendly version of resveratrol that helps defend skin from environmental stress and supports a more even-looking complexion.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratryl Tricaprylate

Resveratryl Tricaprylate

4.0

A stabilized, oil-soluble form of resveratrol that offers antioxidant protection and anti-aging benefits with better stability and skin penetration than plain resveratrol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Resveratryl Tris-Ethylhexanoate

Resveratryl Tris-Ethylhexanoate

4.0

A stabilized, oil-soluble version of resveratrol that offers antioxidant benefits with better skin penetration and less irritation than plain resveratrol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Cell-communicating ingredient

Retinal

Retinal

4.5

Retinal is a highly effective retinoid that works faster than retinol but may cause more irritation, making it best for experienced users seeking visible anti-aging results.

Irritation

moderate

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Cell-communicating ingredient

Retinol

Retinol

4.5

Retinol is a gold-standard anti-aging ingredient that speeds up skin renewal but can cause irritation if not introduced gradually.

Irritation

moderate

Source

semi-synthetic

beautyskincareactive
Read ingredient review

Cell-communicating ingredient

Retinol Yeast Ferment Complex

Retinol, Saccharomyces Polypeptide

4.0

A retinol-peptide hybrid that aims to smooth fine lines and improve texture with a gentler touch than plain retinol.

Irritation

moderate

Source

semi-synthetic

beautyskincareactive
Read ingredient review

Anti-Aging Agent

Retinoxytrimethylsilane

Retinoxytrimethylsilane

4.0

A gentler, more stable version of retinol that can help smooth fine lines and improve skin texture with less irritation.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinoyl Oligopeptide-112

Retinoyl Oligopeptide-112

4.0

A gentle peptide-retinoid hybrid that aims to support smoother, firmer skin without the typical irritation of pure retinol.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinoyl Oligopeptide-86

Retinoyl Oligopeptide-86

4.0

A gentler peptide-retinoid hybrid that aims to smooth fine lines and improve skin texture with less irritation than traditional retinol.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinoyl Pentapeptide-4

Retinoyl Pentapeptide-4

4.0

A gentler alternative to retinol that pairs retinoic acid with a peptide to support collagen and smooth fine lines with less irritation.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinoyl Pullulan

RETINOYL PULLULAN

4.0

A gentle, water-soluble retinoid alternative that aims to smooth fine lines and improve skin texture with less irritation than traditional retinol.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Retinoyl Tetrapeptide-43 Amide

Retinoyl Tetrapeptide-43 Amide

4.0

A gentle peptide-retinoid hybrid that aims to support smoother, firmer-looking skin without the harsh side effects of traditional retinoids.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging

Retinoyl Tripeptide-1

Retinoyl Tripeptide-1

4.3

A gentle peptide-retinoid hybrid that supports collagen without the harsh side effects of pure retinol.

Irritation

low

Source

semi-synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Retinoyl Tripeptide-35

Retinoyl Tripeptide-35

4.0

A gentle peptide alternative to retinol that may help reduce fine lines and improve skin firmness with a lower risk of irritation.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinyl Acetate

Retinyl Acetate

4.0

A gentler, more stable cousin of retinol that still delivers anti-aging benefits with less irritation.

Irritation

moderate

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Retinyl Dimethylglycylprolinate

RETINYL DIMETHYLGLYCYLPROLINATE

4.0

A next-generation retinoid that aims to smooth wrinkles and improve skin texture with a gentler touch than standard retinol.

Irritation

low

Source

semi-synthetic

beautyskincareactive
Read ingredient review

Anti-Aging Agent

Retinyl Formyl Aspartamate

Retinyl Formyl Aspartamate

4.0

A milder retinoid that aims to smooth wrinkles and even skin tone with less redness or peeling than standard retinol.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Retinyl Formyl Aspartate

Retinyl Formyl Aspartate

3.8

A milder vitamin A derivative that may support smoother, younger-looking skin with less irritation than traditional retinol.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinyl Glycolyl Shikimate

RETINYL GLYCOLYL SHIKIMATE

4.0

A newer, potentially gentler retinoid that aims to deliver anti-aging benefits with less irritation than traditional retinol.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Antioxidant

Retinyl Linoleate

RETINYL LINOLEATE

4.0

A milder retinoid that converts to retinol on skin, offering anti-aging benefits with less irritation than pure retinol.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Anti-aging agent

Retinyl Methoxy PEG-22 Acetate

Retinyl Methoxy PEG-22 Acetate

3.8

A gentle, water-soluble retinoid that offers anti-aging benefits with less irritation than traditional retinol.

Irritation

low

Source

semi-synthetic

beautyskincareactive
Read ingredient review

Antioxidant

Retinyl Oleate

Retinyl Oleate

3.8

A gentler vitamin A derivative that may offer anti-aging benefits with less irritation than pure retinol, but with less research backing.

Irritation

moderate

Source

semi-synthetic

beautyskincareantioxidant
Read ingredient review

Antioxidant

Retinyl Palmitate

Retinyl Palmitate

4.0

A gentle vitamin A derivative that supports skin texture and firmness over time, ideal for retinol beginners or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinyl Propionate

RETINYL PROPIONATE

4.0

A milder retinoid that can improve skin texture and reduce fine lines with less irritation than retinol, making it a good option for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Cell-communicating ingredient

Retinyl Retinoate

Retinyl Retinoate

4.0

A newer retinoid that aims to deliver retinoic acid benefits with less irritation, but long-term data is still limited.

Irritation

moderate

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinyl Rice Branate

RETINYL RICE BRANATE

4.0

A milder, less irritating retinoid option that may suit sensitive skin, but with less research backing than retinol.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Retinyl Soyate

RETINYL SOYATE

4.0

A milder, less irritating form of retinol that converts to retinoic acid in the skin, making it a good option for retinol beginners or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Skin conditioner

Retinyl Tallate

Retinyl Tallate

4.0

Retinyl Tallate is a milder retinoid that offers anti-aging benefits with less irritation, making it a good choice for sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincareanti-aging
Read ingredient review

Antioxidant

Reynoutria Fruit Extract

Reynoutria Sachalinensis Fruit Extract

4.0

A gentle plant extract that helps protect skin from environmental stress and may calm irritation, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Anti-Aging Agent

RH-Oligopeptide-17

RH-Oligopeptide-17

4.0

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

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

RH-Oligopeptide-33

RH-Oligopeptide-33

4.0

A lab-made peptide that signals skin to produce more collagen, helping reduce fine lines and improve firmness with low irritation risk.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

RH-Oligopeptide-4

RH-Oligopeptide-4

4.0

A synthetic peptide that may help reduce the look of fine lines and improve skin firmness, but results vary and more human studies are needed.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

RH-Polypeptide-104

RH-Polypeptide-104

3.8

RH-Polypeptide-104 is a lab-made peptide that may help support collagen and improve skin firmness, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

RH-Polypeptide-111

RH-Polypeptide-111

4.0

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

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin-conditioning agent

RH-Polypeptide-20

RH-Polypeptide-20

4.0

A lab-made peptide that may help firm skin and reduce fine lines, with low irritation risk.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Anti-aging agent

RH-Polypeptide-33

RH-Polypeptide-33

3.8

A lab-made peptide that may help support collagen and firm skin, but more human studies are needed to confirm its effects.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

RH-Polypeptide-45

RH-Polypeptide-45

4.0

A lab-made peptide that may help reduce fine lines and improve skin firmness, but human studies are limited.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

RH-Polypeptide-47

RH-Polypeptide-47

3.8

A promising synthetic peptide that may help firm skin and reduce fine lines, but human research is still limited.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Rh-Polypeptide-51

RH-POLYPEPTIDE-51

3.8

A promising biotech peptide that may help firm skin over time, but human research is still limited.

Irritation

low

Source

biotech

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

RH-Polypeptide-52

RH-Polypeptide-52

3.8

A lab-made peptide that may help support collagen and smooth fine lines, but research is still early.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

RH-Polypeptide-58

RH-Polypeptide-58

3.8

A lab-made peptide that may help support collagen and firmness, but human research is still limited.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review