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

Antioxidant

Russula Virescens Extract

RUSSULA VIRESCENS EXTRACT

3.8

A mushroom extract with antioxidant potential, but research is limited—promising but not proven.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rutin

RUTIN

4.0

Rutin is a gentle plant antioxidant that helps defend skin against environmental damage and may support a more even skin tone.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Rutinyl Succinate

Rutinyl Succinate

3.8

A gentle antioxidant that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Emollient

Ruttnera Lamellosa Oil

RUTTNERA LAMELLOSA OIL

4.0

A gentle, plant-based oil from microalgae that hydrates and supports the skin barrier without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Rye Adventitious Root Extract

Secale Cereale Adventitious Root Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Rye Callus Extract

Secale Cereale Callus Extract

4.0

A gentle, plant-based antioxidant that may help calm skin and protect against environmental stress, though research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Skin conditioning

Rye Ferment Filtrate

LACTOBACILLUS/RYE FLOUR FERMENT FILTRATE

4.0

A gentle, fermented ingredient that may help strengthen the skin barrier and support a balanced microbiome.

Irritation

low

Source

biotech

beautyskincaresoothing
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Soothing Agent

Rye Phytoplacenta Extract

SECALE CEREALE PHYTOPLACENTA EXTRACT

3.8

A gentle, plant-derived extract that may help calm and condition the skin, but research is still limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Rye Phytoplacenta Ferment Filtrate

SECALE CEREALE PHYTOPLACENTA CULTURE EXTRACT FILTRATE

3.8

A gentle, plant-based ferment that may help calm skin and fight free radicals, but research is still emerging.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Rye Seed Extract

Secale Cereale Seed Extract

3.8

A gentle, plant-based extract that may help calm skin and provide antioxidant protection, though research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Absorbent

Rye Seed Flour

Secale Cereale Seed Flour

3.8

A gentle, natural absorbent powder that helps control oil and add texture without common irritants found in some clay or synthetic powders.

Irritation

low

Source

natural

beautyskincareabsorbent
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Antioxidant

S-Allylcysteine

S-Allylcysteine

3.8

S-Allylcysteine is a gentle antioxidant from aged garlic that may help protect skin from oxidative stress and soothe inflammation, but research in topical cosmetics is still early.

Irritation

low

Source

natural

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Anti-aging agent

S-Bovine Oligopeptide-1

S-Bovine Oligopeptide-1

3.8

A synthetic peptide that may help firm skin and soften fine lines, but research is limited and mostly from ingredient suppliers.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Antioxidant

S-Glyoxyloyl Acetyl Cysteine

S-GLYOXYLOYL ACETYL CYSTEINE

3.8

A promising but under-researched antioxidant that may help protect skin from environmental stress and support a more even tone.

Irritation

low

Source

semi-synthetic

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Skin conditioning agent

S-HIV-1 Oligopeptide-1

S-HIV-1 Oligopeptide-1

2.5

An experimental peptide with uncertain cosmetic benefits and no established safety profile for topical use.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Antioxidant

S-Lactoylglutathione

S-Lactoylglutathione

4.0

S-Lactoylglutathione is a gentle antioxidant that may help brighten skin and protect against environmental stress, but research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Anti-aging agent

S-Mussel Oligopeptide-1

S-MUSSEL OLIGOPEPTIDE-1

3.8

A synthetic peptide that may help firm and smooth skin, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Anti-Aging Agent

S-Mussel Oligopeptide-2

S-MUSSEL OLIGOPEPTIDE-2

3.8

A marine-inspired peptide that may help firm skin and reduce fine lines, but research is still early.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Anti-aging agent

S-Mussel Polypeptide-1

S-MUSSEL POLYPEPTIDE-1

3.8

A synthetic peptide that may help firm and smooth skin, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Antioxidant

S-Olivoyl Glutathione

S-Olivoyl Glutathione

4.0

A stabilized, oil-friendly form of glutathione that may help brighten skin and fight oxidative stress, though human studies are still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Antioxidant

S-Palmitoyl Glutathione

S-Palmitoyl Glutathione

4.0

A fat-soluble form of glutathione that may help brighten skin and fight oxidative stress, but human evidence is still limited.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Anti-aging agent

S-Rice Oligopeptide-1

S-Rice Oligopeptide-1

3.8

A gentle peptide that may support collagen and skin firmness, but research is still early and benefits are not guaranteed.

Irritation

low

Source

semi-synthetic

beautyskincarepeptide
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Antioxidant

S-Stearoyl Glutathione

S-Stearoyl Glutathione

4.0

A promising antioxidant that may help brighten skin and fight free radicals, but research is still limited compared to more established ingredients.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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Skin conditioning agent

S-Syringoyl Acetyl Methyl Cysteinate

S-Syringoyl Acetyl Methyl Cysteinate

3.8

A gentle, synthetic amino acid derivative that may help calm skin and support barrier repair, though research is still emerging.

Irritation

low

Source

synthetic

beautyskincareconditioning agent
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Anti-wrinkle agent

S-Viper Cysteine-Rich Venom Protein

S-VIPER CYSTEINE-RICH VENOM PROTEIN

3.5

A synthetic peptide that mimics snake venom to temporarily relax expression lines, but evidence is still emerging and results are subtle.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Soothing Agent

Sabatia Angularis Extract

SABATIA ANGULARIS EXTRACT

3.8

A gentle botanical extract with potential soothing and antioxidant benefits, though research is limited and it is not a standout ingredient on its own.

Irritation

low

Source

natural

beautyskincarebotanical
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Humectant

Saccharide Isomerate

Saccharide Isomerate

4.5

A gentle, plant-derived humectant that provides deep, lasting hydration by binding to the skin's surface.

Irritation

low

Source

natural

beautyskincarehumectant
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Flavoring Agent

Saccharin

Saccharin

2.5

Saccharin is a non-nutritive sweetener used in cosmetics to improve taste, but it offers no skincare benefits and is unnecessary for most products.

Irritation

low

Source

synthetic

beautyskincareflavoring agent
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Humectant

Saccharomyces Lysate Extract

Saccharomyces Lysate Extract

4.0

A gentle, fermented yeast extract that hydrates and supports skin barrier health, ideal for sensitive and dry skin types.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Saccharomyces Rice Ferment Filtrate

SACCHAROMYCES/HYDROLYZED GERMINATED RICE GRAIN FERMENT FILTRATE

4.0

A gentle fermented rice ingredient that helps soften skin and improve texture without harsh exfoliation.

Irritation

low

Source

biotech

beautyskincarehumectantexfoliant
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Antioxidant

Saccharomyces/Gold Ferment

SACCHAROMYCES/GOLD FERMENT

3.8

A trendy fermented gold ingredient that may offer antioxidant benefits, but research is limited and its high cost doesn't guarantee superior results over simpler antioxidants.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Humectant

Saccharomyces/Magnesium Ferment

SACCHAROMYCES/MAGNESIUM FERMENT

4.0

A gentle, biotech-derived ferment that pairs yeast metabolites with magnesium to support hydration and a healthy-looking skin barrier.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Antioxidant

Saccharomyces/Manganese Ferment

SACCHAROMYCES/MANGANESE FERMENT

4.0

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

Irritation

low

Source

biotech

beautyskincareantioxidant
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Humectant

Saccharomyces/Potassium Ferment

SACCHAROMYCES/POTASSIUM FERMENT

4.0

A gentle fermented yeast ingredient that helps hydrate and support the skin barrier, especially beneficial for dry or sensitive skin.

Irritation

low

Source

biotech

beautyskincarehumectant
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Skin conditioning agent

Saccharomyces/Silicon Ferment

SACCHAROMYCES/SILICON FERMENT

4.0

A gentle, biotech-derived ingredient that combines yeast ferment with silicon to support skin comfort and a healthy-looking barrier.

Irritation

low

Source

biotech

beautyskincareconditioning agent
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Antioxidant

Sacred Fig Stem Extract

Ficus Religiosa Stem 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

beautyskincareantioxidant
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Antioxidant

Sacred Lotus Flower Extract

Nelumbium Speciosum Flower Extract

4.0

A gentle, antioxidant-rich botanical extract that helps soothe and protect the skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidantsoothing
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Humectant

Sacrum Exopolysaccharides

Aphanothece Sacrum Exopolysaccharides

4.0

A unique, jelly-like polysaccharide from a rare algae that helps hydrate and soothe skin while forming a protective film.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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Antioxidant

Safflower Bud Extract

CARTHAMUS TINCTORIUS BUD EXTRACT

4.0

A gentle, antioxidant-rich plant extract that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Safflower Callus Extract

CARTHAMUS TINCTORIUS CALLUS EXTRACT

3.8

A gentle, plant-derived antioxidant that may help soothe skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Skin conditioning

Safflower Ferment Extract

Pseudozyma Epicola/Safflower Seed Oil Ferment Extract Filtrate

4.0

A gentle, fermented ingredient that helps calm irritation and supports a healthy skin barrier, ideal for sensitive or reactive skin.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Soothing agent

Safflower Flower Juice

CARTHAMUS TINCTORIUS FLOWER JUICE

3.8

A gentle, antioxidant-rich flower water that can help calm skin, but it's not a powerhouse ingredient on its own.

Irritation

low

Source

natural

beautyskincaresoothing
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Exfoliant

Safflower Flower Powder

CARTHAMUS TINCTORIUS FLOWER POWDER

3.8

A gentle, natural exfoliating powder from safflower petals that also adds a warm hue and antioxidant benefits to skincare products.

Irritation

low

Source

natural

beautyskincareexfoliant
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Soothing Agent

Safflower Flower Water

Carthamus Tinctorius Flower Water

3.8

A mild, floral water that can add light hydration and a soothing touch to skincare, but its benefits are subtle and not as well-researched as other ingredients.

Irritation

low

Source

natural

beautyskincaresoothing
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Emollient

Safflower Glyceride

SAFFLOWER GLYCERIDE

4.0

A mild, plant-based emollient that helps soften and smooth skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Emollient

Safflower Oleosomes

CARTHAMUS TINCTORIUS OLEOSOMES

4.0

Safflower oleosomes are a gentle, plant-based moisturizing ingredient that mimics the skin's own lipid structure, offering lightweight hydration without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Safflower Seedcake Extract

CARTHAMUS TINCTORIUS SEEDCAKE EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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