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 Ingredient

Heptylfuran

2-HEPTYLFURAN

3.5

A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Heptylidene Cyclopentanone

2-HEPTYLIDENECYCLOPENTANONE

3.5

A synthetic fragrance ingredient that adds scent but offers no skincare benefits and may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Heptylidene Diacetate

HEPTYLIDENE DIACETATE

3.5

Heptylidene Diacetate is a synthetic fragrance ingredient that adds a pleasant floral note, but it offers no skincare benefits and may be a concern for those sensitive to fragrance.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Preservative

Heptylparaben

Heptylparaben

3.0

Heptylparaben is an effective preservative but has raised some safety concerns due to its paraben family association; it is less common in modern formulations.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Emollient

Heptyltetrahydrofuran

HEPTYLTETRAHYDROFURAN

3.5

A lightweight synthetic emollient that helps products glide on smoothly without a greasy feel.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Heptylundecanol

HEPTYLUNDECANOL

4.0

A gentle, non-greasy emollient that helps soften and smooth skin without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
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Soothing Agent

Herbal Complex Extract

CHAMOMILLA RECUTITA/ROSMARINUS OFFICINALIS/SALVIA OFFICINALIS/THYMUS VULGARIS EXTRACT

4.0

A gentle botanical blend that may help calm irritation and protect skin from environmental stress, but individual sensitivity is possible.

Irritation

low

Source

natural

beautyskincareantioxidantsoothing
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Antioxidant

Herbal Flower & Leaf Extract Blend

LAVENDER FLOWER/(OLIVE/ORIGANUM VULGARE/ROSEMARY/THYME LEAF)/GOLDENSEAL EXTRACT

3.8

A botanical blend rich in antioxidants that may soothe skin, but its complexity and lack of standardization mean results can vary and irritation is possible for sensitive skin.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Antimicrobial

Herbal Leaf Blend Extract

MELALEUCA ALTERNIFOLIA LEAF/ROSMARINUS OFFICINALIS LEAF/THYMUS VULGARIS LEAF EXTRACT

4.0

A natural antimicrobial blend that can help with acne-prone skin but may cause irritation for sensitive types.

Irritation

moderate

Source

natural

beautyskincareantioxidant
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Antioxidant

Herbal Root & Bark Complex

Coptis Chinensis Rhizome/Phellodendron Chinense Bark/Scutellaria Baicalensis Root/Gardenia Jasminoides Fruit Extract

4.0

A traditional herbal blend that may help calm skin and fight environmental stress, but research is mostly lab-based.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Herbal Root & Fruit Complex

Angelica Acutiloba Root/Citrus Aurantium Amara Fruit/Coptis Japonica Root/Forsythia Viridissima Fruit/Gardenia Florida Fruit/Glycyrrhiza Glabra Root/Mentha Arvensis Leaf/Paeonia Lactiflora Root/Platycodon Grandiflorus Root/Rehmannia Glutinosa Root/Scutellaria Baicalensis Root Extract

3.8

A multi-herb blend that may help calm skin and fight free radicals, but research on the specific combination is limited.

Irritation

low

Source

natural

beautyskincareantioxidantsoothing
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Antioxidant

Herbal Root & Fruit Extract

Acorus gramineus root/stem/luffa cylindrica fruit/camellia sinensis leaf extract

3.8

A gentle botanical blend that may offer antioxidant and soothing support, but research on the specific combination is limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Herbal Root & Rhizome Complex

Angelica Acutiloba Root Extract, Paeonia Lactiflora Root Extract, Rehmannia Glutinosa Root Extract, Scutellaria Baicalensis Root Extract, Cnidium Officinale Rhizome Extract, Coptis Chinensis Rhizome Extract, Gardenia Jasminoides Fruit Extract, Phellodendron Chinense Bark Extract

4.0

A traditional herbal blend that may help calm irritation and provide antioxidant protection, though individual herb concentrations are unknown.

Irritation

low

Source

natural

beautyskincareantioxidantsoothing
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Antioxidant

Herbal Root & Seed Complex

(CODONOPSIS TANGSHEN/DIOSCOREA JAPONICA) ROOT/ATRACTYLODES JAPONICA RHIZOME/PORIA COCOS/(DOLICHOS LABLAB/COIX LACRYMA-JOBI MA-YUEN/EURYALE FEROX/NELUMBO NUCIFERA) SEED EXTRACT

3.8

A traditional herbal blend that may offer antioxidant and soothing benefits, but lacks robust modern clinical evidence for skincare.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Herbal Root Complex

Panax Ginseng Root/Poria Cocos/Ophiopogon Japonicus Root/Cornus Officinalis Fruit/Rehmannia Chinensis Root/Dioscorea Batatas Root/Glycyrrhiza Glabra Root Extract

4.0

A gentle botanical blend that may help calm skin and provide antioxidant support, though research is limited for the specific mixture.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Herbal Root Complex Extract

Cimicifuga Dahurica Root/Forsythia Virdissima Fruit/Glycyrrhiza Glabra Root/Paeonia Lactiflora Root/Platycodon Grandiflorus Root/Pueraria Lobata Root Extract

4.0

A gentle, antioxidant-rich botanical blend that may help calm skin and protect against environmental stress, though individual herb concentrations are unlisted.

Irritation

low

Source

natural

beautyskincareantioxidantsoothing
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Antioxidant

Hesperetin

Hesperetin

4.0

Hesperetin is a gentle antioxidant from citrus that helps defend skin against daily damage and may support a brighter, more even complexion.

Irritation

low

Source

natural

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Antioxidant

Hesperetin Laurate

Hesperetin Laurate

4.0

A promising antioxidant that combines citrus-derived hesperetin with lauric acid for better skin delivery and stability.

Irritation

low

Source

semi-synthetic

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Antioxidant

Hesperidin

Hesperidin

4.0

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Heteropanax Fragrans Leaf Extract

HETEROPANAX FRAGRANS LEAF 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

Heteropyxis Natalensis Leaf Extract

HETEROPYXIS NATALENSIS LEAF EXTRACT

3.8

A gentle, antioxidant-rich plant extract that may help calm skin and fight free radical damage, though human studies are limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Antioxidant

Heterosigma Akashiwo Extract

HETEROSIGMA AKASHIWO CELL EXTRACT

3.8

A gentle microalgae extract that may help calm skin and fight environmental stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Anti-Aging Agent

Hexacarboxymethyl Dipeptide-12

Hexacarboxymethyl Dipeptide-12

3.8

A synthetic peptide that may help support collagen and skin firmness, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
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Emollient

Hexacosyl Glycol

Hexacosyl Glycol

4.0

A gentle, non-greasy emollient that helps soften and smooth the skin without clogging pores.

Irritation

low

Source

synthetic

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Emollient

Hexacosyl Glycol Isostearate

Hexacosyl Glycol Isostearate

4.0

A gentle synthetic emollient that softens skin and improves product feel without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Fragrance ingredient

Hexadec-7-en-16-olide

HEXADEC-7-EN-16-OLIDE

3.5

A synthetic musk that adds a warm, floral scent to products; generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexadeca-6,10,14-Trien-3-Ol

HEXADECA-6,10,14-TRIEN-3-OL

3.5

A synthetic fragrance ingredient that adds scent but offers no skincare benefits; may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Emollient

Hexadecane

Hexadecane

3.8

Hexadecane is a lightweight, non-greasy emollient that helps moisturize the skin and improve product texture, but it offers no active benefits beyond basic softening.

Irritation

low

Source

synthetic

beautyskincareemollient
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Fragrance Ingredient

Hexadecanolactone

HEXADECANOLACTONE

4.0

Hexadecanolactone is a synthetic fragrance ingredient that adds a musky, sweet scent to products; it is generally considered safe at low concentrations but may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Emollient

Hexadecene

HEXADECENE

3.5

Hexadecene is a lightweight synthetic emollient that helps products glide on smoothly without feeling greasy, but it offers no active skincare benefits.

Irritation

low

Source

synthetic

beautyskincareemollient
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Film Former

Hexadecenyl Oleylsuccinamide

HEXADECENYL OLEYLSUCCINAMIDE

3.5

A synthetic film-former that helps products stay put on skin and hair, but it's not a star ingredient for most routines.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Hexadecenyl Stearylsuccinamide

HEXADECENYL STEARYLSUCCINAMIDE

3.5

A synthetic film-former that helps products stay put and resist water, but it's not a hero ingredient—just a functional helper.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Emollient

Hexadecyl Methicone

Hexadecyl Methicone

4.0

A lightweight silicone that smooths skin and reduces tackiness, generally well-tolerated and non-comedogenic.

Irritation

low

Source

synthetic

beautyskincareemollient
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Emollient

Hexadecyleicosanoic Acid

Hexadecyleicosanoic Acid

4.0

A gentle synthetic emollient that helps soften and smooth skin without clogging pores or causing irritation.

Irritation

low

Source

synthetic

beautyskincareemollient
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Fragrance Ingredient

Hexadienal Diethyl Acetal

HEXADIENAL DIETHYL ACETAL

3.5

A synthetic fragrance compound that adds a fresh scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexadienyl Acetate

2,4-HEXADIENYL ACETATE

3.5

A synthetic fragrance ingredient that adds scent but offers no skin benefit; may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Film Former

Hexadimethrine Chloride

Hexadimethrine Chloride

3.5

Hexadimethrine Chloride helps hair hold its shape and reduces static, but it can be drying or irritating for sensitive scalps.

Irritation

moderate

Source

synthetic

beautyskincarehaircarefilm former
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Fragrance Ingredient

Hexahydro Dimethyl Methano Indenol

HEXAHYDRO-DIMETHYL-METHANO-INDEN-5-OL

3.5

A synthetic scent ingredient that adds a warm, woody note but offers no skincare benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Hexahydro Tetramethyl Methanonaphthalene

HEXAHYDRO-TETRAMETHYL-METHANONAPHTHALENE

3.8

A synthetic fragrance ingredient that provides a warm, woody scent; generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro Trimethyl Methanoazulene Carbaldehyde

HEXAHYDRO-TRIMETHYL-METHANOAZULENE-6-CARBALDEHYDE

3.5

A synthetic fragrance ingredient that adds a woody, amber scent; generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Hexahydro-4,6 Ingredient

Hexahydro-4,6

2.5

Hexahydro-4,6 is a synthetic ingredient with limited research; it may be used as a fragrance or solvent but lacks robust safety data.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoinden-5-Yl Isobutyrate

HEXAHYDRO-METHANOINDEN-5-YL ISOBUTYRATE

3.5

A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoinden-5-Yl Pivalate

HEXAHYDRO-METHANOINDEN-5-YL PIVALATE

3.5

A synthetic scent ingredient that adds a warm, woody note but offers no skincare benefit and may be unnecessary for sensitive skin.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoinden-5-Yl Propionate

HEXAHYDRO-METHANOINDEN-5-YL PROPIONATE

3.5

A synthetic scent ingredient that adds a pleasant aroma but offers no skincare benefit; safe for most people in low concentrations.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoinden-6-ol

HEXAHYDRO-METHANOINDEN-6-OL

3.5

A synthetic scent ingredient that adds a warm, woody note to products but offers no skin benefit and may cause sensitivity in some people.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance

Hexahydro-Methanoinden-6-yl Isobutyrate

HEXAHYDRO-METHANOINDEN-6-YL ISOBUTYRATE

3.5

A synthetic fragrance ingredient that adds a pleasant woody scent, but has limited safety data and may cause irritation in sensitive individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoinden-6-Yl Pivalate

HEXAHYDRO-METHANOINDEN-6-YL PIVALATE

3.5

A synthetic scent ingredient that adds a warm, woody note to products but offers no skincare benefit and may be unnecessary for sensitive noses.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoinden-6-yl-Isopentenol

HEXAHYDRO-METHANOINDEN-6-YL-ISOPENTENOL

3.5

A synthetic scent ingredient that adds a warm, woody note but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoindene-Butanol

HEXAHYDRO-METHANOINDENE-5-YLIDENE-2-BUTANOL

3.5

A synthetic scent ingredient that adds a woody, amber note but offers no skincare benefit and may be unnecessary for sensitive noses.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Hexahydro-Methanoindenyl Formate

HEXAHYDRO-METHANOINDENYL FORMATE

3.8

A synthetic scent ingredient that adds a warm, woody note to products; generally considered safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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